Electrical Engineering Department
College of Engineering, Architecture, & Technology
De La Salle University – Dasmariñas
Dasmariñas City
Cavite, Philippines
EEET512a – Electrical System Design
DESIGN PROJECT NO 1
SINGLE FAMILY
DWELLING UNIT
November 2019
Prepared by:
Awad, Yousef Marwan B.
Submitted to:
Gener G. Restubog, PEE, MEEE
Professorial Guest Lecturer
CONTENT
1.0 Abstract
2.0 Design Project Description and Objectives
3.0 Design Project Qualification
4.0 Basic of Design
5.0 Design Constraints
6.0 Design Project Deliverables
7.0 Conclusion and Recommendation
1.0 Abstract
This proposed electrical plan for a 2 – story contemporary
house is to be presented to Engr. Generoso Restubog as part
of the requirements for the subject Electrical System Design.
The design should meet all the Philippine Electrical Code
requirements and is to be evaluated by Engr. Restubog.
Herein attached with are the power layout, lighting layout, fire
alarm system, and back – up system for lighting purposes. It
also includes the lighting fixture that are to be installed for the
illumination of the house. This is summarized in the lighting
fixture schedule.
The electrical materials and devices that will be used shall be
available in the local market. The catalogs and brochures are
also included in this design for reference. This design is for
educational purposes only.
2.0 Design Project Description and Objectives
A Single Family Dwelling Unit is a building that typically
consists of one dwelling unit. The typical loads in such a
dwelling unit includes general lighting, small appliances (i.e.
televisions, computers, etc.), washing machines, heaters, air
conditioning units, electric ranges/oven, and water pumps.
The student must be able to prepare a complete electrical
design plan in accordance with the requirements of the 2017
Philippine Electrical Code (PEC), and related technical
documents.
3.0 Design Project Qualification
3.1 Qualification of Residential Building Plan to be used
for Electrical Design
The residential building must be at least two (2) stories
high with a minimum total floor area of 500sqm.
The Architectural floor plan, Perspective and Elevation
plan of the selected residential building must be
submitted to the course professor for approval prior to
commencing the design works.
Any electrical design plan prepared using unapproved
architectural plan shall not be accepted.
All design plans must be drawn in AutoCAD.
4.0 Basic of Design
4.1 Codes and Standards
The design shall conform/adopt the minimum
requirements of the following codes and standards:
Philippine Electrical Code (PEC)
Philippine Standard (PS)
National Electrical Manufacturers’ Association
(NEMA)
Fire Code of the Philippines
National Building Code of the Philippines
MERALCO requirements
4.2 Service
230V, Single – Phase, 2 – Wire Overhead service from
MERALCO shall be provided for the residential building.
This will terminate on a private pole or concrete pedestal
where the electric meter and service equipment shall also
be installed.
4.3 Power Distribution System
Service entrance conductors from the service equipment
shall be installed underground and routed to terminate to
a main panel board to be installed in an appropriate
location inside the residential building.
Two or more panel boards shall be provided. One panel
board shall serve the individual branch circuits for motors,
electric ranges, heaters, and other single loads greater
than 1000VA.
A separate panel board shall be provided for lighting
outlets and small appliances (convenience) outlets branch
circuits.
Adequate number of branch circuits or lighting and
appliances shall be provided to accommodate the total
load demand, uniform load distribution/sharing and the
requirements of the Philippine Electrical Code.
4.4 Back – Up/Alternative Power Source
A 4kW solar panel back – up will be provided for the
Lighting Panel during brownouts.
4.5 Lighting System
Switch – controlled lighting outlets shall be provided for all
area as required by PEC.
Luminaire/lighting fixture schedule shall be provided to
indicate the ratings/specifications and features of the
selected luminaires.
Types of luminaires and their corresponding switch control
device shall be clearly indicated on the lighting layout plan.
4.6 Power Outlets
Adequate number of outlets shall be provided to meet the
total demand load and spacing requirements between
outlets as required by PEC.
All outlets shall be grounded.
GFCI outlets as required by the PEC shall be indicated on
the plan.
Single loads greater than 1000VA shall be provided with a
dedicated (individual) branch circuit.
Mounting height of power outlets shall be indicated on the
plan.
4.7 Fire Alarm System
Fire detection and alarm devices (smoke detectors, heat
detectors, manual pull – down alarms, and alarm bell)
shall be included on the plan.
4.8 Wiring Materials, Equipment, and Devices
All wiring materials, equipment, and devices to be
specified on the electrical shall be available on the local
market, are energy efficient, and does not pollute the
environment.
5.0 Problems and Constraints to be Addressed in the
Design
• Must satisfy the minimum requirements of the Philippine
Electrical Code for safety.
• Must incorporate back – up/alternative power source
using renewable energy like solar, wind, and/or other feasible
sources of renewable energy.
6.0 Design Project Deliverables
6.1 Physical Description, Features and Location
This coastal style home plan with contemporary influences
has about 668.98sqm of living space. It is located in Block 5
Lot 37 Il Giardino Residences, General Trias Cavite. The 2
story floor plan includes 5 bedrooms, 5 bathrooms, and 2
half baths. The plan also includes a 3 – car garage, 2
covered lanais, a foyer, a family room, a study and a home
office for the first floor, and three covered balconies, a sitting
area and a gallery for the second floor. A pool is also
included in the design for the family to enjoy during their
leisure time. A large, spacious garden is provided with
outdoor lights to highlight the beauty of the garden, while
also providing a sort of perimeter lighting for the whole
house. Each bedroom is also provided with its own Walk – In
– Closet for convenience of the occupants. For additional
comfort, each bathroom is equipped with a water heater
hard – wired into the electrical system of the property. 2
refrigerators, 1 at the kitchen and 1 at the dining room,
provides convenience for both the family and the cooks.
Large windows are provided in specific areas to allow the
inside occupants a view of the garden outside the residence.
6.2 Features and Limitation of the Design
The design meets all the minimum requirement of the
Philippine Electrical Code (PEC). All the electrical devices
used in the design is available in the local market, and has
standard safety features. The electrical system design of the
house is protected by a main circuit breaker, with each
branch circuit and individual circuit being provided with its
own circuit breaker to protect the equipment and the
occupants of the house. Fire alarm is included in the design,
with each room having its own smoke/heat detector. The
residential unit also has 4 buzzer alarms. In case of fire,
these buzzers will trigger to alert the occupants of the house.
There is also a provision for a 4kW solar panel to serve as
back – up power for the lighting panel in case of a power
interruption. The limitation of the design is that it has no
calculation for the voltage drop of the conductors, as well as
calculation for the illumination level in each room. The design
also has no provision for telephone cable and other auxiliary
equipment.
6.3 Design Criteria and General Specifications
The design criteria were given by Engr. Generoso Restubog.
All the wiring materials and devices should be placed in its
standard place and elevation, as defined by the code. Each
room in the house should have a convenience outlet to
provide power for the appliances. The spacing of the
convenience outlets follows the code, which states that there
should be a maximum of 1800mm between an appliance and
an outlet, and a maximum of 3600mm between outlets. The
design must also consider the environmental constraints. The
electrical system design has 26 individual branch circuits for
the PP, 2 being spare, 10 branch circuits for the LP, with 1
being spare, and 18 branch circuits for LP2, with 2 being
spare.
The requirements are as follows:
• At least 1 water pump for swimming pool
• Renewable energy back – up
• All the wiring materials and devices must be available in
the local market
The distribution company that will provide power will be
MERALCO. A 230V, single – phase, 2 – wire overhead service
form the utility company shall be provided for the residential
building. This will terminate on a concrete pedestal where
the electric meter and service equipment shall also be
installed. The electrical plan will be using a lateral service
entrance from the pedestal going to the power panel located
in the Living Room. The main feeder of the electrical plan
would be 4 – 50mm2 THWN/22mm2 (GND) through a
53mmØ Rigid Metal Conduit to protect the feeder wire. Two
pairs of parallel conductors are used in order to support the
demand current of the system, while trying to keep costs
down at the same time. The feeder is protected by a
300AT/300AF Inverse Time Circuit Breaker. The total
connected load of the system is 74,479VA. The loads are
divided into two panels. The Power Panel (PP) carries the
large and motor loads, while the Lighting Panel (LP) carries
the lighting and small appliance (convenience outlet) loads.
The overall demand factor of the system is around 72%, and
the feeder calculation is based on this demand.
Every conductor in the system is protected by a conduit. PVC
schedule 40 is utilized for the branch circuits. The sizes of
the conduits are stated in the general specifications and load
schedule of the panel. The design has a back – up system in
case of a power interruption. The proposed capacity is 4kW
to supply the lighting only during power interruptions. There
are one 2HP ACUs, two 1.5HP ACUs, three 1 HP ACUs, two ¾
HP ACUs, two ½ HP ACUs, and two ½ HP Pool Pumps. There
are also one 8kW Electric Range and five 2kW Water
Heaters. There are GFCIs in every bathroom as specified in
the specification data sheet, and the outdoor outlets to be
installed should be waterproof.
Load Analysis
Computation
67670VA
Total Demand Factor = x 100 = 73%
92748 VA
Full Load Current = ( 2760
230
x 1.25)+ (
67670−2760
230 )= 297.22A
Full Load Current = ( 2760
230
x 2.5) + (
67670−2760
230 )= 312.22A
Main Feeder Conductor: Use 4 – 50mm2 THWN + 1 – 22mm2
TW in 53mmØ RMC
Main Protection: Use Inverse Time Circuit Breaker
300AT/350AF
Computation for Lighting Panel
Connected Load Current
23729VA 103.17A
Feeder for Lighting Panel: Use 2 – 38mm2 THWN + 1 8.0mm2 TW
in 35mmØ IMC Nipple
For Protection: Use Inverse Time Circuit Breaker 110AT/150AF
7.0 Conclusion and Recommendation
Conclusion
Overall, to design a single family dwelling it is very
important to use the standard and the Philippine Electrical
Code.
The residential unit has a floor area of 668.98sqm
It has a total connected load of 83,557.52VA, with a
demand load of about 59,743.43VA, and has an overall
demand factor of 71.5%.
The 230V, Single – Phase, 60Hz supplied by MERALCO
will be fed by 2 – 38mm2 THWN + 1 8.0mm2 TW in
35mmØ IMC Nipple with lateral service entrance.
The loads are divided into 2 panels: The Power Panel
(PP) with 26 branch circuits, and Lighting Panel (LP)
with 26 branch circuits as well.
Recommendation
In electrical system design, it is very relevant to know the
clients to be able to know the design they want. It is also important
for us to be familiar with the local market, as well as the brands of
the devices, conductors, and conduits that are available, as this is
needed to know the cost of the design. Another thing to consider is
the Philippine Electrical Code, as this provides the minimum
requirements for a safe operation. In designing, the priority is the
safety of the clients, so follow the standards ang the PEC.
