DISTRIBUTION PLANNING STANDARDS

ESTIMATION OF CUSTOMER LOAD GUIDELINE

(CONNECTED LOAD & DEMAND LOAD)

TABLE OF CONTENTS
SN Description Page
1 INTRODUCTION 5
2 SCOPE 5
3 NEW FEATURES 5
4 DEFINITIONS 6
5 DESCRIPTION OF CUSTOMERS' LOADS 8
6 CLASSIFICATION OF CUSTOMERS' FACILITIES 9
7 METHODOLOGIES 13
8 CLASSIFICATION OF FACILITIES TYPES DUE TO METHODOLOGIES 13
9 HOW TO DETERMINE COVERED/BUILT-UP AREA 16
10 CONNECTED LOADS ESTIMATION FOR NORMAL RESIDENTIAL DWELLING 17
11 CONNECTED LOADS ESTIMATION FOR NORMAL COMMERCIAL SHOPS 19
12 INTERMEDIATE VALUES OF COVERED\BUILT-UP AREA FOR (NORMAL RESIDENTIAL 21
DWELLING TYPE OR NORMAL COMMERCIAL SHOPS TYPE)
13 CONNECTED LOADS ESTIMATION FOR COMBINED TYPE CUSTOMER (NORMAL 22
RESIDENTIAL DWELLING & NORMAL COMMERCIAL SHOPS)
14 CONNECTED LOADS ESTIMATION FOR (NORMAL RESIDENTIAL DWELLING TYPE OR 22
NORMAL COMMERCIAL SHOPS TYPE) WITH CENTRAL AC
15 CONNECTED LOADS ESTIMATION FOR (NORMAL RESIDENTIAL DWELLING TYPE OR 23
NORMAL COMMERCIAL SHOPS TYPE) WITH BOTH WINDOW/SPLIT AC AND
CENTRAL AC
16 CONNECTED LOADS ESTIMATION FOR BIG (NORMAL RESIDENTIAL DWELLING TYPE 24
OR NORMAL COMMERCIAL SHOPS TYPE) WITH BUILT-UP AREA EXCEEDS TABLES'
LIMITS
17 CONNECTED LOADS ESTIMATION FOR (NORMAL RESIDENTIAL DWELLING TYPE OR 24
NORMAL COMMERCIAL SHOPS TYPE) WITH ABNORMAL FLOOR'S HEIGHT (MORE
THAN 3.5 M)
18 CONNECTED LOADS ESTIMATION FOR AREA-BASED TYPES WITH ADDITIONAL 24
SPECIAL LOADS
19 CONNECTED LOADS ESTIMATION FOR THE OTHER REMAINING AREA-BASED 25
CUSTOMERS FACILITIES TYPES (FROM TYPE C3 UP TO TYPE C17)
20 (CONVENTIONAL DECLARED LOAD METHOD) 26
CONNECTED LOADS ESTIMATION FOR NON AREA-BASED CUSTOMERS FACILITY
TYPES (FROM TYPE C18 UP TO TYPE C29)
 TABLE OF CONTENTS

SN Description Page
21 CONNECTED LOADS ESTIMATION FOR AREAS DEVELOPMENT PROJECT OR 27
COMBINED PLOT PLAN
22 CONNECTED LOADS ESTIMATION FOR FACILITY WITHOUT AC (DISTRICT COOLING) 28
23 CONNECTED LOADS ESTIMATION FOR FACILITIES IN WINTER PEAK AREA 29
(WITHOUT AC & WITH HEATING)
24 SPECIALS PROCEDURES FOR FACILITY WITHOUT AC (DISTRICT COOLING) 30
25 CIRCUIT BREAKER AND METER SIZES 30
26 SERVICE METER FOR NORMAL RESIDENTIAL DWELLING & NORMAL COMMERCIAL 30
SHOPS TYPES
27 DEMAND FACTORS FOR ALL FACILITIES TYPES 31
28 COINCIDENT FACTORS 32
29 STEP BY STEP PROCEDURE FOR COINCIDENT DEMAND LOAD CALCULATION 33
30 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR HAJJ AREA 36
31 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR RANDOM AREA 36
32 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR COMMERCIAL 36
CENTER
33 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR COMMERCIAL 37
OFFICES BUILDINGS
34 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR COMPLEX OF 37
WORKSHOPS
35 GENERAL PRINCIPLES 38
APPENDIXES 39
1.0 INTRODUCTION

This document is according to the guidelines of the Electricity & Cogeneration

Regulatory Authority “ECRA”) to calculate the customers minimum loads based on
total covered area of the building. The review of the existing document was initiated
in line with the Council of Ministers decree 324 dated 20/9/1431H approving the
change of the distribution voltage for all customers to the international low voltage
standard 400/230 volts. This document represents the new SEC Distribution
Planning Standards (DPS) for Estimation of Customer Load. This guideline should be
applied and followed in place of the existing SEC Standard in Arabic named
(Customer Load Calculation, Rev.01, Dated: 23/8/1423H)

2.0 SCOPE

This document deals with the estimation of :

 Connected Load
 Demand Load
 Coincident Demand Load
for all categories of customers. It is applicable to all the existing and new customers
to be supplied by SEC.

3.0 NEW FEATURES

The Major New Features in this guideline are :

1. New Classification of Customers' Facilities

2. New Tables for Connected Loads Estimation for Normal Residential Dwelling &
Normal Commercial Shops due to New Voltage (230/400 V)
3. Connected Loads Estimation for buildings with Central AC
4. New Load Density Factor (VA/m2) for all categories of customers.
5. New Form for Conventional Declared Load Method
6. Connected Loads Estimation for Areas Development Project
7. Connected Loads Estimation for Facility without AC (District Cooling)
8. Connected Loads Estimation for Facilities in Winter Peak Area
9. Step by Step Procedure for Coincident Demand Load Calculation
10. Special Case : Load Calculation for Hajj Area
11. Special Case : Load Calculation for Random Area
12. Special Case : Load Calculation for Commercial Center
4.0 DEFINITIONS
Customer :
It is any entity that purchases electrical power from a power utility. It is the owner
of the building/facility supplied by SEC's power system. It is the owner of the supply
request submitted to SEC to get electrical power.

Unit :
It is intended for the building's unit. Each unit should be used by one consumer. Each
building can contain a single unit or multiple units. Each unit should be supplied by
one KWH Meter according to SEC regulations.

Supply Request :
It is the request applied by the customer to get electric power supply from SEC's
power system. It can contain a single building or multiple buildings and subsequently
it can contain a single unit or multiple units and subsequently it can contain a single
KWH Meter or multiple KWH Meters.

Connected Load (CL) :

It is the sum of all the nameplate ratings of all present and future electrical
equipments & installations belongs to the customer's building/facility and could be
used by the customer in future. It is to be estimated before applying any demand
factor or diversity factor. It is expressed in Volt-Amperes (VA).

Demand Load (DL) :

It is the individual maximum demand load of a customer's building's unit usually
occurring during the peak loading period (either estimated or measured). It must be
calculated from the connected load of that customer's building's multiply by the
approved demand factor of that customer's building's unit. It is expressed in Volt-
Amperes (VA).
𝐷𝑒𝑚𝑎𝑛𝑑 𝐿𝑜𝑎𝑑 = 𝐶𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑 𝐿𝑜𝑎𝑑 × 𝐷𝑒𝑚𝑎𝑛𝑑 𝐹𝑎𝑐𝑡𝑜𝑟

Demand Factor (DF):

It is the ratio of the Demand Load of a customer's building's unit to the Connected
Load of that customer's building's unit.
𝐷𝑒𝑚𝑎𝑛𝑑 𝐿𝑜𝑎𝑑
𝐷𝑒𝑚𝑎𝑛𝑑 𝐹𝑎𝑐𝑡𝑜𝑟 =
𝐶𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑 𝐿𝑜𝑎𝑑

Total Demand Load (TDL):

It is the total (non-coincident) demand load of a customer's building with multiple
units. It is the non-coincident summation of all individuals demand loads of all units
belongs to that customer's building. It is expressed in Volt-Amperes (VA).

𝑇𝑜𝑡𝑎𝑙 𝐷𝑒𝑚𝑎𝑛𝑑 𝐿𝑜𝑎𝑑 =  (𝑎𝑙𝑙 𝑖𝑛𝑑𝑖𝑣𝑖𝑑𝑢𝑎𝑙𝑠 𝑑𝑒𝑚𝑎𝑛𝑑 𝑙𝑜𝑎𝑑𝑠)

Coincident Demand Load (CDL):

It is the maximum (coincident) demand load of a customer's building with multiple
units. It must be calculated from the Total Demand Load of that customer's building
multiplying by the approved coincidence factor of that customer's building. It is
expressed in Volt-Amperes (VA).

𝐶𝑜𝑖𝑛𝑐𝑖𝑑𝑒𝑛𝑡 𝐷𝑒𝑚𝑎𝑛𝑑 𝐿𝑜𝑎𝑑 = 𝑇𝑜𝑡𝑎𝑙 𝐷𝑒𝑚𝑎𝑛𝑑 𝐿𝑜𝑎𝑑 × 𝐶𝑜𝑖𝑛𝑐𝑖𝑑𝑒𝑛𝑐𝑒 𝐹𝑎𝑐𝑡𝑜𝑟

Coincidence Factor (CF) :

It is the ratio of the Coincident Demand Load of a customer's building with group of
units (KWH Meters) to the Total Demand Load of that customer's building both
taken at the same point of supply for the same time.

𝐶𝑜𝑖𝑛𝑐𝑖𝑑𝑒𝑛𝑡 𝐷𝑒𝑚𝑎𝑛𝑑 𝐿𝑜𝑎𝑑

𝐶𝑜𝑖𝑛𝑐𝑖𝑑𝑒𝑛𝑐𝑒 𝐹𝑎𝑐𝑡𝑜𝑟 =
𝑇𝑜𝑡𝑎𝑙 𝐷𝑒𝑚𝑎𝑛𝑑 𝐿𝑜𝑎𝑑

Diversity Factor :
It is the inverse of the Coincidence Factor.

Contracted Load:
It is the capacity of power supply (in Volt-Amperes) equivalent to the circuit breaker
rating (in Amperes) provided to the customer's KWH Meter. Supply connection fees
and insurance charges are based on contracted load.

Individual Equipment Demand Factor (IEDF)

It is the demand factor used to calculate the demand of a specific piece of
equipment. Value of IEDF generally varies between 0.1 and 1.0
5.0 DESCRIPTION OF CUSTOMERS' LOADS

5.1 RESISTIVE LOADS

With a resistive load the voltage and current peaks coincide and are therefore in
phase and the power factor is unity.

a) Lighting Loads.
Lighting meant for illumination, bulbs, lamps, tube lights, fluorescent lights,
halogen bulbs, spot lights, search lights, fence lights, outdoor lights, emergency
lights.

b) Other Loads -Receptacles Loads.

Heating meant for accomplishing housekeeping tasks like water heaters, electric
ovens, hot plates, microwaves are major domestic appliance.
TV, CD/DVD players, hi-fi system, video games, PC, LCD, printers, scanners,
phones, clocks, routers, chargers and projectors are light electronic goods
extensively used by customers.

5.2 INDUCTIVE LOADS

With an inductive load the current waveform is lagging behind the voltage
waveform, therefore, the voltage and current peaks are not in phase. The amount
of phase delay is given by the cosine of the angle (Cos), between the vectors
representing voltage and current, and the power factor is less then unity.

a) Air Conditioner Loads (AC). (Window, Split Or Central Type)

A complete system of heating, ventilation and air conditioning is referred as
"HVAC". Its purpose, in a building is to stabilize the air temperature and humidity
within an area for comfort.

b) Other Motor Driven Loads

Refrigerators, freezers, dish washers, vacuum cleaners, laundry appliance fan,
lifts, escalators, garage doors and water pumps.

6.0 CLASSIFICATION OF CUSTOMERS' FACILITIES

6.1 BASIC CONCEPTS

In this document Customers are classified according to the nature of use of their
Facilities in reality and according to their connected and demand load estimation
methodology. This shall not cause any conflict to any other customer classification
used for financial and tariff purposes.

6.2 HOW TO DETERMINE CUSTOMERS' FACILITIES TYPE

Customers' Facilities type should be determined according to the nature of the use
of their Facilities in reality and according to an approved license or official document
from the authority related to the nature of their use. In case there is a difference
between the reality and the license, Customers' Facilities type should be determined
according to the nature of the use of their Facilities in reality.

6.3 TYPES OF CUSTOMERS' FACILITIES

Customers' Facilities are classified into the following Types :

C1 : Normal Residential Dwelling

Description: it is any facility used as Dwelling meant for private use.
Includes: houses, duplexes, apartments, villas, palaces, istrahat, labor housing, etc.

C2 : Normal Commercial Shops

Description: it is any facility designed for use as Commercial Shops.
Includes: Commercial Shops, Commercial Stores, Gold Shops, Pharmacies,
Boutiques, etc.

C3 : Furnished Flats
Description: it is any facility designed for use as Furnished Flats.
Includes: Furnished Flats.

C4 : Hotels
Description: it is any facility designed for use as Hotels.
Includes: Hotels, Motels.

C5 : Malls
Description: it is any facility designed for use as Malls or shopping centers.
Includes: shopping centers, Malls, Supermarkets, Hypermarkets.

C6 : Restaurants
Description: it is any facility designed for use as Restaurants.
Includes: Restaurants, Coffee Shops, Cafeteria.

C7 : Offices
Description: it is any facility designed for use as work offices.
Includes: commercial offices, government offices, office complexes, offices, Banks

C8 : Schools
Description: it is any facility designed for use as Schools.
Includes: Schools, Nursery, Private Training Institute

C9 : Mosques
Description: it is any facility designed for use as Mosques.
Includes: Mosques

C10 : Mezzanine in Hotel

Description: it is any facility designed for use as Mezzanine Floor.
Includes: Mezzanine in Hotel

C11 : Common Area/Services in Buildings

Description: it is any facility designed for use as Common Area/Services in Buildings.
Includes: Roof, Corridors, Stairs, piazza

C12 : Public Services Facilities

Description: it is any facility designed for use as Public Services Facilities.
Includes: outdoor bath rooms, washing rooms

C13 : Indoor Parking

Description: it is any facility designed for use as Indoor Parking.
Includes: Indoor Parking

C14 : Outdoor Parking

Description: it is any facility designed for use as Outdoor Parking
Includes: Outdoor Parking

C15 : Streets Lighting

Description: it is any facility designed for use as Streets Lighting.
Includes: Streets Lights, Roads Lights

C16 : Parks & Gardens

Description: it is any facility designed for use as Parks & Gardens.
Includes: Parks & Gardens

C17 : Open Spaces

Description: it is any facility designed for use as Open Spaces.
Includes: Open Spaces

C18 : Hospitals\Medical Facilities

Description: it is any facility designed for use as Hospitals\Medical Facilities.
Includes: Hospitals, Medical Centers

C19 : Medical Clinics

Description: it is any facility designed for use as Medical Clinics.
Includes: Medical Clinics

C20 : Universities\High Educational Facilities

Description: it is any facility designed for use as Universities\High Educational
Facilities.
Includes: Universities, Colleges, High Educational Institutes

C21 : Light Industries

Description: This includes all industries with load up to (4 MVA) inside designated
Industrial Area or having industrial License.
Includes: Small Factories, Livestock, Poultry, Dairy Farms

C22 : Workshops
Description: it is any facility designed for use as Workshops.
Includes: Workshops

C23 : Cooling Stores

Description: it is any facility designed for use as Cooling Stores.
Includes: Cooling Stores

C24 : Warehouses
Description: it is any facility designed for use as Warehouses.
Includes: Warehouses

C25 : Community Halls

Description: it is any facility designed for use as Community Halls.
Includes: Community Halls, Wedding Party Halls, Auditorium

C26 : Recreational Facilities

Description: it is any facility designed for use as Recreational Facilities.
Includes: Clubs, Theaters, Cinemas, Gymnasium

C27 : Farms\Agricultural Facilities

Description: This includes farms used for producing agricultural products (Big one or
small)
Includes: Farms, Green Houses, Production Farms

C28 : Fuel Stations

Description: it is any facility designed for use as Fuel Stations.
Includes: Petrol Pumps, Fuel Stations

C29 : Bulk Factories

Description: This includes all industries with load more than (4 MVA) inside
designated Industrial Area or having industrial License.
Includes: Big Factories, manufacturing plants

7.0 METHODOLOGIES
In order to determine the connected and demand load of a customer the following
two methodologies are described in this document for the use of concerned
departments of SEC as following :
1. Area Load Density Method
2. Declared Load Method

7.1 AREA LOAD DENSITY METHOD

This method is required to be implemented as per instructions of Ministry of Water
and Electricity (formerly Ministry of Industry & Electricity “MI&E”), covered area of
the customer premises is used as basic parameter for the assessment of the size of
power supply to the customer.
Its application is limited to the Residential/ Commercial customers whose areas are
defined the covered area tables. Such customers are normally expected to have
uniform behavior in terms of electrical requirements.

7.2 CONVENTIONAL DECLARED LOAD METHOD

This method is used to estimate the load of those customers who have a variety of
load requirements. It is essentially based on customer load declaration. Information
regarding the ratings of equipments to be installed and their usage is mainly
required. Customer shall provide load information/details.
Note:
Large residential/Commercial customers, where the covered area is beyond the
limits given in the relevant tables OR all other type of customers who have a variety
of load requirement irrespective of Floor Area or Lot Size, the power supply
requirement of all such customers shall be estimated by using Declared Load
Method.

8.0 CLASSIFICATION OF FACILITIES TYPES DUE TO METHODOLOGIES

According to the Connected Load Estimation Methodologies, the Facilities Types are
classified into two groups as following :

1. Area-Based Facility Type

2. Non Area-Based Facility Type
8.1 AREA-BASED FACILITY TYPE
All Facilities Types which their Connected Load can be estimated according to Area
Load Density Method. It includes the following Facilities Types as mentioned in Table
(1) below :

Table (1)

Type due to Methodology Code Customer Category

Normal Residential Dwelling, Houses,
Duplexes , Apartments , Villas,
C1 Palaces , Istrahat , Labor Housing,
etc.

Normal Commercial Shops,

Commercial Shops, Commercial
C2
Stores, Gold Shops, Pharmacies,
Boutiques, etc.
C3 Furnished Flats
C4 Hotels, Motels
Malls, Shopping Centers,
C5
Supermarkets, Hypermarkets.
C6 Restaurants, Coffee Shops, Cafeteria.
Area-Based Facility Type Offices, Commercial Offices,
C7 Government Offices, Office
(Area Load Density Method) Complexes, Banks.
Schools, Nursery, Private Training
C8
Institute.
C9 Mosques
C10 Mezzanine in Buildings/ Facilities
Common Area/Services in Buildings,
C11
Roof, Corridors, Stairs, Piazza.
Public Services Facilities, Outdoor
C12
Bathrooms, Washing Rooms.
C13 Indoor Parking
C14 Outdoor Parking
C15 Streets Lighting
C16 Parks & Garden
C17 Open Spaces

8.2 NON AREA-BASED FACILITY TYPE

All Facilities Types which their Connected Load cannot be estimated according to
Area Load Density Method and should be estimated according to Declared Load
Method. It includes the following Facilities Types as mentioned in Table (2) below :

Table (2)

Type due to Methodology Code Customer Category

C18 Hospitals/Medical Facilities
C19 Medical Clinics
Universities/High Educational Facilities,
C20
Colleges, High Educational Institutes.
Light Industries, Small Factories,
C21
Livestock, Poultry, Dairy Farms.
C22 Workshops
Non Area-Based Facility
C23 Cooling Stores
Type
C24 Warehouses
(Conventional Declared Community Halls, Wedding Party Halls ,
C25
Load Method) Auditorium.
Recreational Facilities, Clubs, Theaters,
C26
Cinemas, Gymnasium.
Farms/Agricultural Facilities, Green
C27
Houses, Production Farms
C28 Fuel Stations, Petrol Pumps.
Bulk Factories, Big Factories,
C29
Manufacturing Plants.

9.0 HOW TO DETERMINE COVERED/BUILT-UP AREA

There are three types of Area used in Area Load Density Method as follows :
9.1 UNIT'S COVERED/BUILT-UP AREA

It is an individual built-up area for a customer's unit. It is calculated based on the

drawings provided by the customer of its building or the project with approved
municipal documents.

9.2 TOTAL COVERED/BUILT-UP AREA

It is the total built-up area for a plot land. It is the sum of covered or roofed areas
excluding services areas which are open. Building's covered area shall be cross
checked with approved municipal documents/permits to ascertain its correctness.
Covered area is calculated based on the drawings provided by the customer of its
building or the project.

Where total covered area is not mentioned in the building permits, it can be
calculated by applying allowed percentage of construction of the buildings on the
plot land multiplied by the allowed number of floors in the area, by using the
following equation :

𝑇𝑜𝑡𝑎𝑙 𝐶𝑜𝑣𝑒𝑟𝑒𝑑 (𝐵𝑢𝑖𝑙𝑡 − 𝑈𝑝)𝐴𝑟𝑒𝑎

= 𝑃𝑙𝑜𝑡 𝐿𝑎𝑛𝑑 𝐴𝑟𝑒𝑎
× 𝐴𝑙𝑙𝑜𝑤𝑒𝑑 𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑜𝑓 𝐶𝑜𝑛𝑠𝑡𝑟𝑢𝑐𝑡𝑖𝑜𝑛 𝑜𝑛 𝑃𝑙𝑜𝑡 𝐿𝑎𝑛𝑑
× 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝐹𝑙𝑜𝑜𝑟𝑠

9.3 PLOT LAND AREA

It is the total area for a land contains covered area's part and open area's part.

10.0 CONNECTED LOADS ESTIMATION FOR NORMAL RESIDENTIAL DWELLING

(Facility Category : C1)
 Calculate the total connected load (KVA) according to the Unit covered/built-up area
(square meter) from the Electricity & Cogeneration Regulatory Authority “ECRA”)
guidelines. Use the New Tables : Table (3) & Table (4).
Table (3)
Facility Category ( C1 ) : Loads Of Residential Buildings -220 V Phase To Phase
Constructed Area Total Connected Circuit Breaker Constructed Area Total Connected Circuit Breaker
of Building Load Rating of Building Load Rating
(m²) (KVA) (AMP) (m²) (KVA) (AMP)
25 4 801 114
50 8 30 825 116
75 12 850 120
76 13 875 123
300
100 16 40 900 126
110 17 925 130
111 18 950 133
125 20 50 975 136
150 24 976 137
151 25 1000 140
175 28 1025 143
70
200 32 1050 146
225 36 1075 150
400
226 37 1100 152
250 40 100 1125 156
275 43 1150 160
300 46 1175 163
301 47 1200 166
325 50 1201 167
125
350 53 1300 180
375 56 1400 193 500
376 57 1500 206
400 60 1600 220
425 63 150 1601 221
450 66 1700 233
460 68 1800 246 600
461 69 1900 260
475 70 2000 273
500 73 2001 274
525 76 2100 286
200
550 80 2200 300
575 83 2300 313
800
600 86 2400 326
625 90 2500 340
626 91 2600 354
650 93 2700 366
675 96 2701 367
700 100 2800 380
250
725 103 2900 394
1000
750 106 3000 406
775 110 3200 433
800 113 3400 459

Table (4)
 Facility Category ( C1 ) : Loads Of Residential Buildings - 230/400 V
Constructed Area Total Connected Circuit Breaker Constructed Area Total Connected Circuit Breaker
of Building Load Rating of Building Load Rating
(m²) (KVA) (AMP) (m²) (KVA) (AMP)
25 4 901 127
50 8 925 130
20
75 12 950 133
100 16 975 136
101 17 1000 140
125 20 30 1025 143
150 24 1050 146 200
151 25 1075 150
175 28 40 1100 152
200 32 1125 156
201 33 1150 160
225 36 50 1175 163
250 40 1200 166
251 41 1201 167
275 43 1300 180
250
300 46 70 1400 193
325 50 1500 206
350 53 1501 207
375 56 1600 220
300
376 57 1700 233
400 60 1800 246
425 63 1801 247
450 66 1900 260
475 70 100 2000 273
500 73 2100 286 400
525 76 2200 300
550 80 2300 313
575 83 2400 326
576 84 2401 327
600 86 2500 340
625 90 2600 354
650 93 125 2700 366 500
675 96 2800 380
700 100 2900 394
725 103 3000 406
726 104 3001 407
750 106 3200 433
775 110 3400 459 600
800 113 3500 470
150
825 116 3600 486
850 120 3601 487
875 123 3800 513
900 126 4000 540
4200 567 800
4400 594
4600 621
4800 648

11.0 CONNECTED LOADS ESTIMATION FOR NORMAL COMMERCIAL SHOPS

(Facility Category : C2)
 Calculate the total connected load (KVA) according to the Unit covered/built-up area
(square meter) from Electricity & Cogeneration Regulatory Authority “ECRA”)
guidelines. Use the New Tables : Table (5) & Table (6).
Table (5)
Facility Category ( C2 ) : Loads Of Commercial Buildings - 220 V Phase To Phase
Total
Constructed Area Total Connected Circuit Breaker Constructed Area of Circuit Breaker
Connected
of Building Load Rating Building Rating
Load
(m²) (KVA) (AMP) (m²) (KVA) (AMP)
25 6 601 129
50 10 30 625 134
55 12 650 139
56 13 675 144
400
75 16 50 700 150
100 22 725 155
101 23 750 160
125 27 70 775 166
150 32 776 167
151 33 800 171
175 38 100 850 182
500
200 43 900 192
201 44 950 203
225 48 1000 214
250 54 150 1001 215
275 59 1050 224
300 64 1100 235
600
301 65 1150 246
325 70 1200 256
350 75 200 1250 267
375 80 1251 268
400 86 1300 278
401 87 1400 299
1500 800
425 91 320
450 96 250 1600 342
475 102 1700 363
500 107 1701 364
501 108 1800 384
1000
525 112 2000 427
550 118 300 2100 448
575 123
600 128

Table (6)

Facility Category ( C2 ) : Loads Of Commercial Buildings - 230/400 V

Constructed Area Total Connected Circuit Breaker Constructed Area Total Connected Circuit Breaker
of Building Load Rating of Building Load Rating
(m²) (KVA) (AMP) (m²) (KVA) (AMP)
25 6 776 167
50 10 800 171
75 16 30 825 176
100 22 850 182 250
110 24 875 187
111 25 900 192
125 27 925 198
50
150 32 926 199
175 38 950 203
176 39 975 208
200 43 1000 214
70 300
225 48 1025 219
250 54 1050 224
251 55 1075 230
275 59 1125 240
300 64 100 1126 241
325 70 1200 256
350 75 1300 278 400
375 80 1400 299
376 81 1500 320
400 86 1501 321
425 91 1600 342
450 96 1700 363 500
150
475 102 1800 384
500 107 1850 395
525 112 1851 396
550 118 2000 427
600
551 119 2100 448
575 123 2200 469
600 128 2201 470
625 134 2300 491
650 139 2400 512
200
675 144 2500 533
700 150 2600 555 800
725 155 2700 576
750 160 2800 597
775 166 2900 619
3000 640

12.0 INTERMEDIATE VALUES OF COVERED\BUILT-UP AREA FOR [NORMAL

RESIDENTIAL DWELLING TYPE (C1) OR NORMAL COMMERCIAL SHOPS TYPE
(C2)]
The values of intermediate areas shall be interpolated to the nearest value. If the
exact covered area is found in the table all values pertaining to the customer power
supply can be directly read from the table.

In the Tables : Table (3) & Table (4) & Table (5) & Table (6) ; of floor area with slabs
providing border line values for each block. Any area in between the slabs shall be
assessed in proportion to the nearest slab and the corresponding values determined
accordingly.

𝐴 − 𝐴1
𝐶𝐿 = [( ) × (𝐶𝐿2 − 𝐶𝐿1 )] + 𝐶𝐿1
𝐴2 − 𝐴1

Where:
𝐶𝐿 = Customer Connected Load for an intermediate area value
𝐴 = Covered area of the customer which is an intermediate value
𝐴1 = Covered area step in the table immediate lower than area 𝐴
𝐴2 = Covered area step in the table immediate higher than area 𝐴
𝐶𝐿1 = Connected load for area 𝐴1
𝐶𝐿2 = Connected load for area 𝐴2

The above formula can be used to calculate demand load also by replacing
connected load figures with demand load.

Notes :
Adjacent steps from the table shall be taken for calculating intermediate values.

Borderline cases between floor area slabs involving decimals shall be rounded off
to nearest integers. Accordingly "0.5 and above" shall be treated as '1' and included
in the higher slab and decimal values < 0.5 shall be ignored.

The range of customer sizes in each slab has been given in terms of KVA in the tables.

13.0 CONNECTED LOADS ESTIMATION FOR COMBINED TYPE CUSTOMER

[NORMAL RESIDENTIAL DWELLING (C1) & NORMAL COMMERCIAL SHOPS
(C2)]

In case the customer building consists of both residential and commercial load e.g.
shops on ground floors and residential apartments on above floors the connected
load shall be assessed separately corresponding to the areas associated with each
using the Tables : Table (3) & Table (4) & Table (5) & Table (6) .

The total connected load shall be the sum total of the two values.

 Determine floor area of the customer buildings separately for each category.
 Read out from the appropriate tables the connected and demand load in each
category.
 Determine the total contracted load by simple addition of circuit breakers ratings
in each category.
 Determine the total Coincident Demand Load as follows :

Total Coincident Demand Load =

= Single Largest Demand + Sum of Remaining Demands

Diversity Factor (of Remaining Demands)

14.0 CONNECTED LOADS ESTIMATION FOR [NORMAL RESIDENTIAL DWELLING

(C1) & NORMAL COMMERCIAL SHOPS (C2)] WITH CENTRAL AC

Since AC load is already included in the values provided in the tables as customer
minimum load, the same shall be subtracted from the connected load figure before
adding central AC load at the following rate:

Residential Customers = 100 VA/ sq. m

Commercial Customers = 150 VA/ sq. m

If the customer declared load for central AC happens to be less than the unit AC load
as computed above, central AC load shall be ignored.

 Determine covered area of the customer building.

 Determine the total connected load from the appropriate tables.
 Determine the unit AC connected load as per procedure given above.
 Subtract the estimated unit AC load from the total connected load and add
customer declared central AC load to obtain total connected load of the
customer provided it is more than the estimated unit AC load, otherwise it shall
be ignored.
 Calculate the customer demand load as follows :
 Demand Load = (Non-AC Connected Load x DF) + Central AC Load

 Read out all other parameters of power supply from the tables against the
computed total connected load, as obtained by above calculations.
 If the demand load of the customer exceeds the circuit breaker rating provided
for the slab, select the next higher size breaker which is adequate to provide for
the demand load of the customer.

15.0 CONNECTED LOADS ESTIMATION FOR [NORMAL RESIDENTIAL DWELLING

(C1) & NORMAL COMMERCIAL SHOPS (C2)] WITH BOTH WINDOW/SPLIT AC
AND CENTRAL AC

 Determine the floor area of the customer building in each category.

 Proportionally, determine the connected and the Unit AC load for each category
from the total load corresponding to the total area.
 Determine connected and demand load for the portion of the building equipped
with central AC .
 Obtain total connected load of the customer as follows :

Total Connected Load = Connected Load for Central AC Area

+ Connected Load for Unit AC Area

 Obtain total Demand Load of the customer as follows:

Total Demand Load = Demand Load for Central AC Area

+ [Connected load for Unit AC Area x D.F]

 Read out all other parameters of Power supply from the tables against the
computed total Connected load (as obtained by calculations)

 If the Total Demand Load (as calculated above) exceeds the circuit breaker rating
provided for the slab, select the next higher size breaker which is adequate to
meet the demand load of the customer.

16.0 CONNECTED LOADS ESTIMATION FOR BIG [NORMAL RESIDENTIAL

DWELLING (C1) & NORMAL COMMERCIAL SHOPS (C2)] WITH BUILT-UP AREA
EXCEEDS TABLES' LIMITS
For such customers (type C1 and type C2) an average load requirement VA/m² is
considered as appropriate method for the load calculation as follows :

𝑇𝑜𝑡𝑎𝑙 𝐶𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑 𝐿𝑜𝑎𝑑 (𝐾𝑉𝐴)

𝐵𝑢𝑖𝑙𝑡 𝑢𝑝 𝐴𝑟𝑒𝑎 (𝑚2) × 𝐿𝑜𝑎𝑑 𝐷𝑒𝑛𝑠𝑖𝑡𝑦 (𝑉𝐴/𝑚2)
=
1000

By using the following load density :

Residential Customers = 145 VA/ sq. m

Commercial Customers = 215 VA/ sq. m

17.0 CONNECTED LOADS ESTIMATION FOR [NORMAL RESIDENTIAL DWELLING

(C1) & NORMAL COMMERCIAL SHOPS (C2)] WITH ABNORMAL FLOOR'S
HEIGHT (MORE THAN 3.5 M)

Assessment of AC Load for Mezzanine cases or for buildings with ceilings higher than
the standard height of 3.5 meters shall be as follows:

Additional volume (m³) = [Total Height (m) - Standard Height (3.5 m) X Covered Area
(m2)

Additional AC Load (VA) =(30 VA/m³) × Additional volume (m3)

The calculated extra AC load by above formula shall be added as an additional load
as follow :
Total Connected Load = Standard Connected Load from tables (3,4,5,6) + Additional
AC Load
18.0 CONNECTED LOADS ESTIMATION FOR AREA-BASED TYPES WITH
ADDITIONAL SPECIAL LOADS

Connected loads according to Area Load Density Method are only covering normal
loads , any additional loads should be considered & added as additional special
loads.
Examples: Swimming pool loads, Additional elevator, Central AC.
19.0 CONNECTED LOADS ESTIMATION FOR THE OTHER REMAINING AREA-BASED
CUSTOMERS FACILITIES TYPES (FROM TYPE C3 UP TO TYPE C17)

For all such customers (from type C3 up to type C17) an average load requirement
VA/m² is considered as appropriate method for the load calculation. Use Table (7).

𝑇𝑜𝑡𝑎𝑙 𝐶𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑 𝐿𝑜𝑎𝑑 (𝐾𝑉𝐴)

𝐵𝑢𝑖𝑙𝑡 𝑢𝑝 𝐴𝑟𝑒𝑎 (𝑚2) × 𝐿𝑜𝑎𝑑 𝐷𝑒𝑛𝑠𝑖𝑡𝑦 (𝑉𝐴/𝑚2)
=
1000
 Table (7)
Code Customer Category Loads included* VA/m2
(Lights + Air Conditioning + Power
C3 Furnished Flats 175
Sockets)
(Lights + Air Conditioning + Power
C4 Hotels 240
Sockets)
(Lights + Air Conditioning + Power
C5 Malls 255
Sockets)
(Lights + Air Conditioning + Power
C6 Restaurants 235
Sockets)
(Lights + Air Conditioning + Power
C7 Offices 220
Sockets)
(Lights + Air Conditioning + Power
C8 Schools 180
Sockets)
(Lights + Air Conditioning + Power
C9 Mosques 185
Sockets)
(Lights + Air Conditioning + Power
C10 Mezzanine in Hotel 100
Sockets)
Common Area/Services in
C11 (Lights + Power Sockets) 60
Buildings
C12 Public Services Facilities (Lights + Power Sockets) 50
C13 Indoor Parking (Lights + Vans + Gates + Safety Systems) 30
C14 Outdoor Parking (Lights) 5
C15 Streets Lighting (Lights) 5
C16 Parks & Garden (Lights + Water Distributor) 4
C17 Open Spaces (Lights) 3
Note : This is only covering normal loads , any additional loads will be considered &
added as special loads.

20.0 (CONVENTIONAL DECLARED LOAD METHOD)

CONNECTED LOADS ESTIMATION FOR NON AREA-BASED CUSTOMERS
FACILITY TYPES (FROM TYPE C18 UP TO TYPE C29)
For all such customers (from type C18 UP to type C29) Ask customer for declared list
(use Conventional Declared Load method) and use individual equipment demand
loads.

SEC – Load Declaration Form (SEC-LD)

Where the covered area is beyond table limits and for all types of customers who
have a variety of load requirement irrespective of floor area or plot size cannot be
assessed for their power supply requirement by the Table (7).

Use the load declaration form in Appendix (A2) which covers various industrial
(motors) equipments, to assess the connected load of industrial, light industries
(including hangers and warehouses) and agricultural customers as in the past.

These customers will be requested to fill this form at the time of filing request of
supply application. This will be the basic information for the study of power supply
requirement of the customer.

Ascertain the customer declared load is not less than the minimum load indicated in
Table (8).

Review of the connected load of large customers SEC – Enquiry Form (SEC-EF)

Large customers whose load exceeds the standard level will continue to declare
their load on the consolidated SEC Enquiry Form (SEC-EF) as per Appendix (A2).
These customers will be requested to fill this form at the time of filing request of
supply application. This will be the basic information for the study of power supply
requirement of the customer.

21.0 CONNECTED LOADS ESTIMATION FOR AREAS DEVELOPMENT PROJECT OR

COMBINED PLOT PLAN
For all such customers, an average load requirement VA/m² is considered as
appropriate method for the load calculation. Use Table (8).
Table (8)
 Cod
Customer Category Loads included* VA/m2
e
(Lights + Air Conditioning + Power
C3 Furnished Flats 175
Sockets)
(Lights + Air Conditioning + Power
C4 Hotels 240
Sockets)
(Lights + Air Conditioning + Power
C5 Malls 255
Sockets)
(Lights + Air Conditioning + Power
C6 Restaurants 235
Sockets)
(Lights + Air Conditioning + Power
C7 Offices 220
Sockets)
(Lights + Air Conditioning + Power
C8 Schools 180
Sockets)
(Lights + Air Conditioning + Power
C9 Mosques 185
Sockets)
(Lights + Air Conditioning + Power
C10 Mezzanine in Hotel 100
Sockets)
Common Area/Services in
C11 (Lights + Power Sockets) 60
Buildings
C12 Public Services Facilities (Lights + Power Sockets) 50
C13 Indoor Parking (Lights + Vans + Gates + Safety Systems) 30
C14 Outdoor Parking (Lights) 5
C15 Streets Lighting (Lights) 5
C16 Parks & Garden (Lights + Water Distributor) 4
C17 Open Spaces (Lights) 3
(Lights + Air Conditioning + Power
C18 Hospitals\Medical Facilities 250
Sockets)
(Lights + Air Conditioning + Power
C19 Medical Clinics 225
Sockets)
Universities/High (Lights + Air Conditioning + Power
C20 245
Educational Facilities Sockets)
C21 Light Industries (Lights + Motors + Power Sockets + AC) 280
C22 Workshops (Lights + Power Sockets) 80
C23 Cooling Stores (Lights +Chillers + Power Sockets) 260
C24 Warehouses (Lights + Vans + Power Sockets) 70
(Lights + Air Conditioning + Power
C25 Community Halls 230
Sockets)
(Lights + Air Conditioning + Power
C26 Recreational Facilities 200
Sockets)
Farms\Agricultural
C27 (Lights + Power Sockets) 130
Facilities
C28 Fuel Stations (Lights + Power Sockets) 90
C29 Bulk Factories (Lights + Power Sockets) 295
Note : This is only covering normal loads , any additional loads will be considered &
added as special loads.
22.0 CONNECTED LOADS ESTIMATION FOR FACILITY WITHOUT AC (DISTRICT
COOLING)
For all such customers, an average load requirement VA/m² is considered as
appropriate method for the load calculation. Use Table (9).
Table (9)
Cod
Customer Category VA/m2
e Loads included*
C3 Furnished Flats (Lights + Power Sockets) 80
C4 Hotels (Lights + Power Sockets) 95
C5 Malls (Lights + Power Sockets) 75
C6 Restaurants (Lights + Power Sockets) 95
C7 Offices (Lights + Power Sockets) 90
C8 Schools (Lights + Power Sockets) 80
C9 Mosques (Lights + Power Sockets) 65
C10 Mezzanine in Hotel (Lights + Power Sockets) 40
Common Area/Services in
C11 (Lights + Power Sockets) 60
Buildings
C12 Public Services Facilities (Lights + Power Sockets) 50
(Lights + Vans + Gates + Safety
C13 Indoor Parking 30
Systems)
C14 Outdoor Parking (Lights) 5
C15 Streets Lighting (Lights) 5
C16 Parks & Garden (Lights + Water Distributor) 4
C17 Open Spaces (Lights) 3
C18 Hospitals\Medical Facilities (Lights + Power Sockets) 115
C19 Medical Clinics (Lights + Power Sockets) 100
Universities/High
C20 (Lights + Power Sockets) 125
Educational Facilities
C21 Light Industries (Lights + Motors + Power Sockets) 240
C22 Workshops (Lights + Power Sockets) 80
C23 Cooling Stores (Lights + Power Sockets) 25
C24 Warehouses (Lights + Vans + Power Sockets) 70
C25 Community Halls (Lights + Power Sockets) 115
C26 Recreational Facilities (Lights + Power Sockets) 90
Farms\Agricultural
C27 (Lights + Power Sockets) 115
Facilities
C28 Fuel Stations (Lights + Power Sockets) 70
C29 Bulk Factories (Lights + Motors + Power Sockets) 250
Note : This is only covering normal loads , any additional loads will be considered &
added as special loads.

23.0 CONNECTED LOADS ESTIMATION FOR FACILITIES IN WINTER PEAK AREA

(WITHOUT AC & WITH HEATING)
For all customers, belonging to areas where Air Conditioners are not used and
instead heating appliances are used due to specific climatic conditions. Specifically
for these customers an average load requirement VA/m² is considered the
appropriate method for the load calculation as given in Table (10).
Table (10)
Code Customer Category Loads included* VA/m2
C3 Furnished Flats (Lights + Air Heating + Power Sockets) 145
C4 Hotels (Lights + Air Heating + Power Sockets) 195
C5 Malls (Lights + Air Heating + Power Sockets) 200
C6 Restaurants (Lights + Air Heating + Power Sockets) 195
C7 Offices (Lights + Air Heating + Power Sockets) 180
C8 Schools (Lights + Air Heating + Power Sockets) 150
C9 Mosques (Lights + Air Heating + Power Sockets) 150
C10 Mezzanine in Hotel (Lights + Air Heating + Power Sockets) 80
Common Area/Services in
C11 (Lights + Power Sockets) 60
Buildings
C12 Public Services Facilities (Lights + Power Sockets) 50
C13 Indoor Parking (Lights + Vans + Gates + Safety Systems) 30
C14 Outdoor Parking (Lights) 5
C15 Streets Lighting (Lights) 5
C16 Parks & Garden (Lights + Water Distributor) 4
C17 Open Spaces (Lights) 3
C18 Hospitals\Medical Facilities (Lights + Air Heating + Power Sockets) 210
C19 Medical Clinics (Lights + Air Heating + Power Sockets) 190
Universities/High
C20 (Lights + Air Heating + Power Sockets) 210
Educational Facilities
(Lights + Motors + Power Sockets +
C21 Light Industries 265
Heating)
C22 Workshops (Lights + Power Sockets) 80
C23 Cooling Stores (Lights +Chillers + Power Sockets) 260
C24 Warehouses (Lights + Vans + Power Sockets) 70
C25 Community Halls (Lights + Air Heating + Power Sockets) 195
C26 Recreational Facilities (Lights + Air Heating + Power Sockets) 165
C27 Farms\Agricultural Facilities (Lights + Power Sockets) 125
C28 Fuel Stations (Lights + Power Sockets) 85
 (Lights + Motors + Power Sockets +
C29 Bulk Factories 280
Heating)
Note : This is only covering normal loads , any additional loads will be considered &
added as special loads.

24.0 SPECIALS PROCEDURES FOR FACILITY WITHOUT AC (DISTRICT COOLING)

a) When a customer facility with a District Cooling system (Load without AC) apply
to get power from SEC network , SEC should ask this customer to make an
agreement with Cooling System Provider.
b) The customer should submit a copy from the signed agreement between
customer and Cooling System Provider to SEC.
c) The customer should make the Cooling System Provider to coordinate with SEC
to study the demand required for the Cooling System Provider.
d) After finalizing the study regards supplying of the Cooling System Provider , the
SEC can accept to study the load of the customer without AC by using Table (9).

25.0 CIRCUIT BREAKER AND METER SIZES

Circuit breaker and meter sizes are standardized by SEC. The customers are charged
based on circuit breaker size in KVA instead of the declared/minimum connected
load.

26.0 SERVICE METER FOR NORMAL RESIDENTIAL DWELLING & NORMAL

COMMERCIAL SHOPS TYPES

A 30 Amps circuit breaker is normally considered to be adequate for general

services. If it does not meet customer requirement due to big associated
facilities/equipments Declared Load method shall be used to assess the connected
and demand load for service meter.
27.0 DEMAND FACTORS FOR ALL FACILITIES TYPES

Table (11)

Code Customer Category DF

C1 Normal Residential Dwelling 0.60
C2 Normal Commercial Shops 0.70
C3 Furnished Flats 0.70
C4 Hotels 0.75
C5 Malls 0.70
C6 Restaurants 0.70
C7 Offices 0.70
C8 Schools 0.80
C9 Mosques 0.90
C10 Mezzanine in Hotel 0.75
C11 Common Area/Services in Buildings 0.80
C12 Public Services Facilities 0.75
C13 Indoor Parking 0.80
C14 Outdoor Parking 0.90
C15 Streets Lighting 0.90
C16 Parks & Garden 0.80
C17 Open Spaces 0.90
C18 Hospitals\Medical Facilities 0.80
C19 Medical Clinics 0.70
C20 Universities/High Educational Facilities 0.80
C21 Light Industries 0.90
C22 Workshops 0.90
C23 Cooling Stores 0.90
C24 Warehouses 0.70
C25 Community Halls 0.80
C26 Recreational Facilities 0.80
C27 Farms/ Agricultural Facilities 0.90
C28 Fuel Stations 0.70
C29 Bulk Factories 0.90
28.0 COINCIDENT FACTORS
Table (12)
Number Number Number
Coincident Coincident Coincident
of of of
Factor Factor Factor
Meters Meters Meters
CF(N) CF(N) CF(N)
N N N
1 1.000 34 0.581 67 0.568
2 0.723 35 0.581 68 0.568
3 0.688 36 0.580 69 0.568
4 0.668 37 0.579 70 0.568
5 0.654 38 0.579 71 0.567
6 0.644 39 0.578 72 0.567
7 0.636 40 0.578 73 0.567
8 0.629 41 0.577 74 0.567
9 0.624 42 0.577 75 0.566
10 0.619 43 0.576 76 0.566
11 0.616 44 0.576 77 0.566
12 0.612 45 0.575 78 0.566
13 0.609 46 0.575 79 0.566
14 0.607 47 0.575 80 0.566
15 0.604 48 0.574 81 0.565
16 0.602 49 0.574 82 0.565
17 0.600 50 0.573 83 0.565
18 0.598 51 0.573 84 0.565
19 0.597 52 0.573 85 0.565
20 0.595 53 0.572 86 0.564
21 0.594 54 0.572 87 0.564
22 0.592 55 0.572 88 0.564
23 0.591 56 0.571 89 0.564
24 0.590 57 0.571 90 0.564
25 0.589 58 0.571 91 0.564
26 0.588 59 0.570 92 0.564
27 0.587 60 0.570 93 0.563
28 0.586 61 0.570 94 0.563
29 0.585 62 0.570 95 0.563
30 0.584 63 0.569 96 0.563
31 0.583 64 0.569 97 0.563
32 0.583 65 0.569 98 0.563
33 0.582 66 0.568 99 0.563
29.0 STEP BY STEP PROCEDURE FOR COINCIDENT DEMAND LOAD CALCULATION

29.1 For Customers’ Buildings with LV Meters (from 20 A up to 800 A).

1. Number of Individual units in customer's building should be determined

according to SEC Customer Services Manual with its latest up. If Number of
Individual units is not available from municipality , Minimum possible number of
Individual units per floor should be used.
2. Connected Load (CL) in (KVA) for each Individual unit in customer's building
should be estimated, unit by unit, referring to this Guideline. Load Estimation
should be according to unit wise (for each unit individually unit by unit).
3. For C1 and C2 Customer Type, Individual Circuit Breaker Rating (CBR) in (Amp)
for the Individual KWH Meter for each Individual unit in customer's building
should be determined according to the estimated connected load (CL) of that
Individual unit and referring to Tables (3, 4, 5, 6).
4. For Customer Types (from C3 up to C29), Individual Circuit Breaker Rating (CBR)
in (Amp) for the Individual KWH Meter for each Individual unit should be
determined to be the nearest up SEC standard Circuit Breaker Rating according
to estimated connected load (CL) of that Individual unit.
5. Number of Individual KWH Meters (N) required for the customer's building
should be determined according to number of Individual units in customer's
building and referring to SEC Customer Services Manual with its latest updates.
6. Calculate the Coincident Demand Load (CDL) in (Amp) for the group of all KWH
Meters of the customer's building as follows :

𝐶𝐷𝐿 = (∑ 𝐶𝐵𝑅𝑖 × 𝐷𝐹𝑖 ) × 𝐶𝐹(𝑁)

𝑖=1
Where :
𝑁 = Number of Individual KWH Meters required for the customer's building.
𝐶𝐵𝑅𝑖 = Circuit Breaker Rating in (Amp) for the Individual KWH Meter no. (𝑖).
𝐷𝐹𝑖 = Demand Factor for the Individual KWH Meter no. (𝑖) which should be
determined according to the utilization nature of the concerned
Individual unit no. (𝑖) in customer's building and referring to this
Guideline.
𝐶𝐹(𝑁) = Coincident Factor for the group of all KWH Meters of the customer's
building which should be determined according to Number of these
 KWH Meters (𝑁) and referring to this Guideline. Use the following
equation to calculate the Coincident Factor (𝑁) :

0.33
(0.67 + )
𝐶𝐹(𝑁) = √𝑁
1.25

𝐹𝑜𝑟 𝑁 = 1 ⇒ 𝐶𝐹(𝑁) = 1

1
𝐷𝑖𝑣𝑒𝑟𝑠𝑖𝑡𝑦 𝐹𝑎𝑐𝑡𝑜𝑟 (𝑁) =
𝐶𝐹(𝑁)
Note :
For a group of (𝑁) KWH Meters in the customer's building where all of them have
same Circuit Breaker Rating (CBR) in (Amp) and same Demand Factor (DF), the
equation to calculate the Coincident Demand Load (CDL) in (Amp) for this group
of KWH Meters could be simplified as follows :

𝐶𝐷𝐿 = 𝑁 × 𝐶𝐵𝑅 × 𝐷𝐹 × 𝐶𝐹(𝑁)

Note :
For a group of (𝑁) KWH Meters in the customer's building where any one of them
has different Circuit Breaker Rating (CBR) in (Amp), the equation to calculate the
Coincident Demand Load (CDL) in (Amp) for this group of KWH Meters will be as
follows :

𝑁−1

𝐶𝐷𝐿 = [𝐶𝐵𝑅 𝐿𝑎𝑟𝑔𝑒𝑠𝑡 × 𝐷𝐹 𝐿𝑎𝑟𝑔𝑒𝑠𝑡 ] + [(∑ 𝐶𝐵𝑅𝑖 × 𝐷𝐹𝑖 ) × 𝐶𝐹(𝑁 − 1)]

𝑀𝑒𝑡𝑒𝑟 𝑀𝑒𝑡𝑒𝑟
𝑖=1

29.2 For Customers’ Buildings designed to be supplied by Private Substation or

by MV RMU

1. Connected Load (CL) in (KVA) for each Individual unit in customer's building
should be estimated, unit by unit, referring to this Guideline. Load Estimation
should be according to unit wise (for each unit individually unit by unit).
2. Calculate the Coincident Demand Load (CDL) in (KVA) for the group of all Units of
the customer's building as follows :
 𝑁

𝐶𝐷𝐿 = (∑ 𝐶𝐿𝑖 × 𝐷𝐹𝑖 ) × 𝐶𝐹(𝑁)

𝑖=1

Where :
𝑁 = Number of Individual Units required for the customer's building.
𝐶𝐿𝑖 = Connected Load in (KVA) for the Individual Unit no. (𝑖).
𝐷𝐹𝑖 = Demand Factor for the Individual Unit no. (𝑖) which should be determined
according to the utilization nature of the concerned Individual unit no.
(𝑖) in customer's building and referring to this Guideline.
𝐶𝐹(𝑁) = Coincident Factor for the group of all Units of the customer's building
which should be determined according to Number of these Units (𝑁)
and referring to this Guideline. Use the following equation to
calculate the Coincident Factor (𝑁) :

0.33
(0.67 + )
𝐶𝐹(𝑁) = √𝑁
1.25

𝐹𝑜𝑟 𝑁 = 1 ⇒ 𝐶𝐹(𝑁) = 1

1
𝐷𝑖𝑣𝑒𝑟𝑠𝑖𝑡𝑦 𝐹𝑎𝑐𝑡𝑜𝑟 (𝑁) =
𝐶𝐹(𝑁)
Note :
For a group of (𝑁) KWH Meters in the customer's building where all of them have
same Circuit Breaker Rating (CBR) in (Amp) and same Demand Factor (DF), the
equation to calculate the Coincident Demand Load (CDL) in (Amp) for this group
of KWH Meters could be simplified as follows :

𝐶𝐷𝐿 = 𝑁 × 𝐶𝐿 × 𝐷𝐹 × 𝐶𝐹(𝑁)
Note :
For a group of (𝑁) KWH Meters in the customer's building where any one of them
has different Circuit Breaker Rating (CBR) in (Amp), the equation to calculate the
Coincident Demand Load (CDL) in (Amp) for this group of KWH Meters will be as
follows :

𝑁−1

𝐶𝐷𝐿 = [𝐶𝐿 𝐿𝑎𝑟𝑔𝑒𝑠𝑡 × 𝐷𝐹 𝐿𝑎𝑟𝑔𝑒𝑠𝑡 ] + [(∑ 𝐶𝐿𝑖 × 𝐷𝐹𝑖 ) × 𝐶𝐹(𝑁 − 1)]

𝑈𝑛𝑖𝑡 𝑈𝑛𝑖𝑡 𝑖=1
3. According to the calculated Coincident Demand Load (CDL) of the unit, the Circuit
Breaker Rating (CBR) in (Amp) for the KWH Meter for the unit should be
determined to be the nearest up SEC standard Circuit Breaker Rating (Private
Substation’s Circuit Breaker or MV RMU’s Circuit Breaker) to that (CDL).

29.3 For Development Project Or Plot Plan

1. For Customers’ Buildings with LV Meters (from 20 A up to 800 A), calculate their
Coincident Demand Load (CDL) on their Public Substation as follows :

𝐶𝐷𝐿 𝑜𝑛 𝑆𝑢𝑏𝑠𝑡𝑎𝑡𝑖𝑜𝑛 = (∑ 𝐶𝐵𝑅𝑖 × 𝐷𝐹𝑖 ) × 𝐶𝐹(𝑁)

𝑖=1
Where :
𝑁 = Number of all KWH Meters supplied by that Substation.

2. For Customers’ Buildings designed to be supplied by Private Substation or by MV

RMU, calculate their (CDL) according to steps described in (clause 29.2).

3. Calculate the Total Coincident Demand Load (CDL) for the (Development Project
/ Plot Plan) as follows :

𝐶𝐷𝐿 𝑇𝑜𝑡𝑎𝑙 = (∑ 𝐶𝐷𝐿𝑖 ) × 𝐶𝐹𝐹𝑜𝑟 𝑆𝑢𝑏𝑠𝑡𝑎𝑡𝑖𝑜𝑛𝑠 × 𝐶𝐹𝐹𝑜𝑟 𝑀𝑉 𝐹𝑒𝑒𝑑𝑒𝑟𝑠

𝑖=1
Where :
𝑁 = Number of all (Public Substations + Private Substations + MV
RMUs) which designed to supply all Lots/Buildings within the
(Development Project / Plot Plan).
𝐶𝐷𝐿𝑖 = Coincident Demand Load in (KVA) for the Individual element
(Public Substations + Private Substations + MV RMUs) no. (𝑖).
𝐶𝐹𝐹𝑜𝑟 𝑆𝑢𝑏𝑠𝑡𝑎𝑡𝑖𝑜𝑛𝑠 = Coincident Factor between (Public Substations + Private
Substations + MV RMUs) = 0.9
𝐶𝐹𝐹𝑜𝑟 𝑀𝑉 𝐹𝑒𝑒𝑑𝑒𝑟𝑠 = Coincident Factor between (MV Feeders) = 0.9

Or (Only in case of Master Plan Stage without detailed Networks

design) :
 𝑁 = Number of all Lots/Buildings within the (Development Project
/ Plot Plan).
𝐶𝐷𝐿𝑖 = Coincident Demand Load in (KVA) for the Individual Lot/Building
no. (𝑖).

Note :
Calculate the Coincident Demand Load (CDL) in (KVA) of the customer's building
from the calculated Coincident Demand Load (CDL) in (Amp) as follows :

𝐶𝐷𝐿𝑖𝑛 𝐴𝑀𝑃 × 𝑉𝐿𝐿 × √3

𝐶𝐷𝐿𝑖𝑛 𝐾𝑉𝐴 =
1000
Where :
𝑉𝐿𝐿 = Nominal Voltage (line to line) of the LV Network (in volts).

This equation can be simplified as follows :

𝐶𝐷𝐿𝑖𝑛 𝐴𝑀𝑃
𝐶𝐷𝐿𝑖𝑛 𝐾𝑉𝐴 =
𝐹𝐶𝑜𝑛𝑣𝑒𝑟𝑠𝑖𝑜𝑛
Where :
𝐹𝐶𝑜𝑛𝑣𝑒𝑟𝑠𝑖𝑜𝑛 = Conversion Factor to convert (CDL) from (Amp) to (KVA). Its values
for different nominal voltages are shown in the following Table (13) below.

Table (13)
Standard Nominal Voltages
(V)
Conversion
Factor
400 380 220
𝐹𝐶𝑜𝑛𝑣𝑒𝑟𝑠𝑖𝑜𝑛
1.443 1.519 2.624

30.0 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR HAJJ AREA

Hajj Load is intended any building used for pilgrims lodging. The Hajj Area is the area
which has permits from municipality to build buildings using for pilgrims lodging. For
these areas with this type, the Calculation of Coincident Demand Load should be
based on the following special considerations :
1. The Demand Factor (DF) is 0.9.
2. The Coincident Factor (CF) is 1.0.

31.0 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR RANDOM

AREA

The Random Area is the area which is considered as un-planned area according to
the municipality and which has many buildings without construction permits from
the municipality. Usually in this area type, the un-permitted buildings get the supply
illegally from the permitted buildings. For these areas with this type, the Calculation
of Coincident Demand Load should be based on the following special considerations
:
1. The Demand Factor (DF) is 1.0.
2. The Coincident Factor (CF) is 0.8.

32.0 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR

COMMERCIAL CENTER

The Commercial Center or any group of commercial shops which apply common
working time so that all its shops are to be opened and closed at the same time , for
this type of commercial shops , the Calculation of Coincident Demand Load should
be based on the following special considerations :
1. The Demand Factor (DF) is 0.7.
2. The Coincident Factor (CF) is 1.0.

33.0 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR

COMMERCIAL OFFICES BUILDINGS

The Commercial Offices Building which apply common working time so that all its
Offices are to be opened and closed at the same time , for this type of commercial
Offices, the Calculation of Coincident Demand Load should be based on the
following special considerations :
1. The Coincident Factor (CF) is 1.0.
2. The Demand Factor (DF) is 0.7

34.0 SPECIAL CASE : COINCIDENT DEMAND LOAD CALCULATION FOR COMPLEX

OF WORKSHOPS

The Complex Of Workshops which apply common working time so that all its
Workshops are to be opened and closed at the same time , for this type of
Workshops, the Calculation of Coincident Demand Load should be based on the
following special considerations :
1. The Coincident Factor (CF) is 1.0.
2. The Demand Factor (DF) is 0.9.

35.0 GENERAL PRINCIPLES

 If any type of customer provide his study in Area-based method. Review it by

using (VA/m2 All Categories Min. Loads : Area-based types & Non Area-based
type - one value) and should be not less than it
 If any type of customer provide his study in declared List (conventional
method). Review it by using (declared list form) and should be not less than
the estimation using (VA/m2 All Categories Min. Loads : Area-based types &
Non Area-based type - one value).
 In all Cases when the loads estimation done by company Customer shall
confirm that satisfy his requirements and no more loads required (should be
documented).
 In all Cases loads estimation provided by customer can be more than loads
estimation using (VA/m2 All Categories Min. Loads : Area-based types & Non
Area-based type - one value) and in this case customer should provide
technical justifications for that.
 In all Cases loads estimation provided by customer is not accepted to be less
than loads estimation using (VA/m2 All Categories Min. Loads : Area-based
types & Non Area-based type - one value).
 APPENDIXES
A1. INDIVIDUAL EQUIPMENT DEMAND FACTORS (IEDF)
A2. LOAD DECLARATION BY CUSTOMERS , SEC- ENQUIRY FORM (SEC-EF)

APPENDIX (A1)
INDIVIDUAL EQUIPMENT DEMAND FACTORS (IEDF)

Demand Factors Used by SEC

S/N Type of Load
Residential Commercial Industrial Agr. Farms
 1 Central A/Cs 0.9 0.9 0.9 0.9

2 Window Type A/Cs 0.6 0.6 0.7 0.7

3 Lighting (Interior / Exterior) 1.0 1.0 1.0 1.0

4 Refrigeration / Cooling 0.6 0.6 0.6 0.6

5 Fans / Blowers 0.2 0.2 0.2 0.2

6 Equipment Used in Kitchens 0.2 0.2 0.2 -

7 Water Heaters 0.2 0.2 0.2 -

8 Laundry Equipment 0.2 0.2 0.2 -

9 Appliances Used for Recreation 0.2 0.2 - -

10 Appliances Used for Services 0.2 0.2 0.2 -

11 Equipment Used in Office / Labs - 0.2 0.2 -

12 Welding Equipment - 0.15 0.20 -

Electric Motors Used for Crafts,

13 - 0.25 0.25 -
Workships & Service Centers

Electric Motors Used for Batch Work,

14 - - 0.4 0.4
Fluctuating of Multiple Production

Electric Motors Used for Continuous

15 - - 0.6 -
Process and Mass Production

16 Process Heating Using Ovens - - 0.35 -

17 Process Heating Using Furances - - 0.7 -

18 Miscellaneous (not covered above) 0.1 0.1 0.1 0.1

NOTE: Demand factors are based on the following:

- IEEE STD 241-1974
- Electric Utility Engineering Reference Book by Westinghouse.
APPENDIX (A2)
LOAD DECLARATION BY CUSTOMERS
SEC- Enquiry Form [SEC-EF]

CUSTOMER'S NAME
CUSTOMER'S ADDRESS
CUSTOMER CLASS Residential [ ] Commercial [ ] Industrial [ ]
SUPPLY VOLTAGE 127/220 V [ ] 220/380 V [ ] 277/480 V [ ]
TYPE OF A/Cs USED Central [ ] Window/Split [ ] Mixed [ ]
TYPE TOTAL RATING
ITEM OF UNITS PER UNIT
# LOAD (No.) (WATTS) REMARKS

1 CENTRAL A/Cs
- Unit # 1 (specify) …………
- Unit # 2 (specify) …………
- Unit # 3 (specify) …………
- Unit # 4 (specify) …………
- Unit # 5 (specify) …………

2 WINDOW/SPLIT A/Cs
- 1.0 Ton
- 1.25 Ton
- 1.5 Ton
- 2.0 Ton
- 3.0 Ton
- 4.0 Ton
- Others (specify)

3 LIGHTING LOADS
- Ordinary Lamps
- Flourescent Lamps
- Spot Lights (Halogen)
- Chandeliers (specify)
- Security Lights (specify)
- Others (specify)

4 FAN LOADS
- Fan (Ceiling/Floor)
- Exhaust Fans
- Blower Fans
- Others (specify)

5 REFRIGRATION LOADS
- Refrigerators
- Deep Freezers
- Ice Making Machine
- Water Coolers
- Others (specify)
- Others (specify)

TYPE TOTAL RATING

ITEM
OF UNITS PER UNIT
#
LOAD (No.) (WATTS) REMARKS

6 KITCHEN LOADS
- Electric Range
- Electric Ovens
- Dish Washers
- Toasters
 - Mixers
- Water Heaters
- Others (specify)

7 BATHROOM LOADS
- Water Heaters
- Others (specify)

8 LAUNDRY LOADS
- Washing Machines
- Dryers for Clothes
- Others (specify)

9 RECREATIONAL LOADS
- Televisions
- Audio/Vidio Systems
- Film Projectors
- Public Address System
- Exercise Equipment
- Others (specify)

10 SERVICES LOADS
- Electric Irons
- Vacuum Cleaners
- Intercom Systems
- Water Pumps
- Lift/Elevators
- Others (specify)

11 SECURITY LOADS
- Fire Alarm Systems
- Burgler Alarm Systems
- Emergency Fire Pumps
- Others (specify)

12 OFFICE EQUIPMENT
- ElectricTypewriters
- Photocopying Machines
- Data Processing Equipment
- Others (specify)
- Others (specify)
TYPE TOTAL RATING REMARK
ITEM
# OF UNITS PER UNIT
LOAD (No.) (WATTS)

13 LAB EQUIPMENT
- Air Compressors
- Vacuum Pumps
- Centrifuge Pumps
- Hot Plates
 - Sterilizers
- X-Ray Machines
- Sonographic Machines
- Others (specify)

14 WELDING EQUIPMENT
- Butt Welding Equipment
- Arc Welding Equipment
- High Frequency Welding
- Others (specify)

15 ELECTRIC MOTORS (*) USED FOR CRAFTS

WORK SHOPS & SERVICE CENTERS
- Lathe Machines
- Drilling Machines
- Presses
- Saw Mashines
- Millers
- Shapers
- Others (specify)

16 ELECTRIC MOTORS (*) USED FOR BATCH WORK

EDUCDATING, OR MULTIPLE PRODUCTION
- Specify……………………..
- Specify……………………..

17 ELECTRIC MOTORS (*) USED FOR CONTINEOUS

PROCESS & MASS PRODUCTION
- Specify……………………..
- Specify……………………..

18 PROCESS HEATING USING ELECTRIC OVENS

- Specify……………………..
- Specify……………………..

19 PROCESS HEATING USING ELECTRIC FURNACES

- Specify……………………..
- Specify……………………..

20 MISCL. LOADS (Not covered in Items # 1-19 above)

- Specify……………………..
- Specify……………………..