EE409 ELECTRICAL STANDARDS AND PRACTICE 2020-2021; 2ND Sem
Module 3 PEC Part 1
Engr. Rosalynn C. Hernandez
Module Introduction
This module will contribute a great help to the students to define what is PEC CODE 1 and 2,
identify the different parts of PEC Code, explain the different parts of PEC Code and explain the
different parts of PEC Code
This course is intended for regular third year Electrical Engineering students.
This will help the students to attain the following Intended Learning Output
Assess the student’s understanding on the operation of distribution systems
and equipment (knowledge)
Summarize necessary tools and techniques to be able to model, analyze, and
design electric distribution systems (application)
Design a distribution system including accessories and protection (evaluation)
There is a Module Exercises at the end of every topic for the students to answer and review all
the lessons that they learned.
EE409 ELECTRICAL STANDARDS AND PRACTICE 2020-2021; 2ND Sem
Module 3 PEC Part 1
Engr. Rosalynn C. Hernandez
THE PEC consist of 2 parts:
Part1 (volume 1)- consist of rules which regulates electrical installation done “inside” the
building
Part 1( volume 2)- consist of rules which regulates electrical installation applied to “watercraft”
PartII- consist of rules which regulates electrical installation done ‘outside” the building.
Mandatory Rules, Permissive Rules, & Explanatory Material:
1. Mandatory Rules- mandatory rules of this Code are those that identify actions that are
specifically required or prohibited and are characterized by the use of the terms “shall” or
“shall not”
2. Permissive Rules- Permissive rules of this code are those that identify actions that are
allowed but not required, are normally use to describe options or alternative methods, and
are characterized by the use of terms “shall be permitted”or “shall not be required”.
3. Explanatory material- Explanatory material, such as references to other standards,
references to related sections of this Code, or information related to a Code rule,is
included in this Code in the form of fine print notes (FPN). Fine print notes are
informational only and are not enforceable as requirements of this Code.
Purpose of PEC:
1. Practical Safeguarding-The purpose of this Code is the practical safeguarding of
persons and property from hazard arising from the use of electricity.
2. Adequacy- This Code contains provisions that are considered the minimum
requirements necessary for safety. Compliance there with and proper maintenance
will result in an installation that is essentially free from hazard but not necessarily
free efficient, convenient or adequate for good service or future expansion of
electrical use.
3. Intention- This Code is intended for exclusive use of licensed electrical practitioners
(PEE, REE and RME). This code is not intended as a design specification nor
instruction manual for a non licensed electrical practitioner, unless under the
supervision of a licensed electrical practioner.
4. Relation to Other International Standards- The requirement in this code address
the fundamental principles of protection for safety contained in Section 131of
International Electrotechnical Commission (IEC) Standards 60364-1, Electrical
Installations of Buildings.
IEC 60364-1, Section 131 Contains fundamental principles of protection for safety
that encompasses protection against thermal effects, protection against overcurrent,
protection against fault currents and protection against over voltage. All of these
potential hazards are addressed by the requirements in this Code.
Who enforces the PEC?
1. This code is intended for amndatory application by government bodies exercising
legal jurisdiction over electrical installations.
2. These government bodies, only through a licensed electrical practitioner, shall have
responsibility of implementing the provisions of this Code in deciding on the
approval of equipment and materials and for granting special permission
contemplated in this Coded, where it is assured that equivalent objectives can be
achieved by establishing and maintaining effective safety.
EE409 ELECTRICAL STANDARDS AND PRACTICE 2020-2021; 2ND Sem
Module 3 PEC Part 1
Engr. Rosalynn C. Hernandez
3. The authority having jurisdiction may waive specific requirements in this code or
permit alternate methods where it is assured that equivalent objectives can be
achieved by establishing and maintaining effective safety.
4. This code may require new products, constructions, or materials that may not yet be
availableat the time this Code is adopted. In such event, the authority having
jurisdiction may permit the use of the produtcs, constructions or materials that
comply with the most recent previous edition of this Coded adopted by the
jurisdiction.
WHO authorized the PEC?
1. This code has been approved and adopted by the Board of electrical engineering
(BEE), Professional Regulation Commission (PRC).
2. By virtue of authority vested in the Board under RA 7920, it herreby directs strict
adherence to the provisions of this Code.
3. Where deviations from these provisions are necessary, such deviations shall not
be made, except with written permission fromt this government bodies exercising
legal jurisdiction applicable only to the particular job for which such permission
was granted.
What are the coverage or scope of PEC?
Covered: This code covers the installation of electrical conductors, equuipment,
and raceways, monitoring, signaling and communication conductors, equipment andd raceways
and optical fiber cables and raceways installed within or on, to or from:
1. Public and Private Buildings, including but not limited to residential, commercial
industrial institutional, cultural, agricultural agro-industrial, planned unit development
and all other buldings/premises that may require practical safeguarding or persons and
property from hazards arising from use of electricity.
2. Electric Generating Plants
3. Industrial Plants
4. Transformer Stations
5. Permanent and Temporary Substations
6. Airfields
7. Railway Switchyards
8. Yard, Carnivals, parking and other lots
9. Quarries and mines
10. Watchcraft
11. Dockyards
12. Trailers
13. Mobilehomes and recreational vehicles
14. Offshore facilties
Not covered: This code does not cover the following:
1. Installations in railway rolling stock, aircraft, or automotive vehicles
2. Installations of railways for generation, transformation, transmission or distribution of
power used exclusively for operation of rolling stock.
What Covers Electrical Inspection?
Inspection- criteria for examination of equipment for:
EE409 ELECTRICAL STANDARDS AND PRACTICE 2020-2021; 2ND Sem
Module 3 PEC Part 1
Engr. Rosalynn C. Hernandez
1. Suitability for the installation
2. Mechanical Strength and durability
3. Wire bending and connection space
4. Electrical Insulation
5. Heating effects produced by the equipment under normal and abnormal condition for use
6. Arcing effects
7. Class type, size, voltage, ampacity specific use of equipment
Definition of Terms:
Service- the conductors and equipment for delivering energy from the electric supply system to
the wiring system of the premises served. Which consist of:
For Overhead Service:
1. Service Drop- the overhead service conductors from the last pole or other aerial support
including splices if any, connecting to the service entrance conductors in a building or
other structures, And shall not be smaller than 8mm2 Cu or 14mm2 Al or Cu-clad Al
Clearnaces of Service Drop
a) Above roof-2400mm
b) Vertical clearances from ground:
3000mm- at electric service entrance to buildings,also at the lowest point of the drip loop.
3600mm- over residential property and driveaways, and those commercial areas not
subject to truck traffic where voltage does not exceeds 300 Volts to ground.
4500 mm- for those areas listed in the 3700mm classification where the voltage exceeds
600 Volts to ground.
5500mm- over public streets, alleys, roads parking areas subject to truck traffic.
c) Clearance from building opening- 900 mm from windows that are designed to be
opened.
d) Clearance from swimming pools- 6900 mm in any direction from water level. ( see
table 6.80.1.8)
2) Service Entrance- the service conductors between the terminal of the service
equipment and a point usually outside the building, clear of building, walls, where joined
by a taps or splices or splices to the service drop, and shall be of size adequate to carry
the load intended to serve.
Note: A building or other structure served be supplied by one service only.
EXCEPTIONS: For the following:
a) Special conditions
1. Fire pumps (high pressure) for the building
2. Emergency electrical systems
3. Legally required stand by sytems
4. Optional stand by systems
5. Parallel power production systems
6. Systems designed for connection to multiple sources of supply for the purpose of
enhance reliability.
b) Special occupancies
1. Multiple occupancy building where there is no available space for service
equipment accesible to all occupancies.
EE409 ELECTRICAL STANDARDS AND PRACTICE 2020-2021; 2ND Sem
Module 3 PEC Part 1
Engr. Rosalynn C. Hernandez
2. Multiple occupancy building or group of single detached buildings owned or
oerated /managed by one 1) person or entity and where spaces are available., a
main service shall be allowed to to service entrance equipment of each occupant
and common loads, if any.
3. A single building or other structure sufficiently large to make two or more
services necessary.
c) Ccapacity Requirements
1. Where the capacity requirements are in excess of 2000 A at a supply voltage of
600 volts or less.
2. Where load requirements of a single phase installation are greater than the serving
agency normally supplies through one service.
d) Different Characteristics
Additional services shall be permitted for different voltages, frequencies or phases or
for different uses, such as for different rate schedules.
e) Identification
Where a building or structure is supplied by more than one service or any
combination of branch circuits, feeder and services, a permanent plaque or directory
shall be installed at each service disconnect location demoting all other services,
feeders and branch circuits supplying that building or structure and the area served by
each (see Section 2.25.2.8)
3. Service Equipment- the necessary equipment , usually consisting of a circuit
breaker or switches and fuses and their accesories, connected to the load end of
service conductors to a building or other structure , or an otherwise designated
area, and inteded to constitute the main control and cut off of the supply. This
shall be located inside or outside wall of the building served or to the nearest
point of entry of non building structure served.
B. FOR UNDERGROUND SERVICE:
1. SERVICE LATERAL-The underground service conductors between the street
main including any risers at a pole or other structure or from transfomers, and the first
point of connection to the service entrance conductors in a terminal box or other
enclosure, inside or outside the building wall. Where there is no terminal box, meter
or other enclosure, the point of connection is considered to be the point of entrance of
the service conductors into the building, and shall not be smaller than 8.0mm2 Cu
&14mm2 Al or Cu-clad Al.
Clearance of Service Lateral: (from ground, see Table 3.0.1.5)
600mm- directly buried cable
150mm- RMC or IMC insatllation
450mm- PVC approved fro direct burial without concrete encasement
450mm- other approved raceway for direct burial.
2. SERVICE ENTRANCE ( underground)- the service conductors between the terminals
of the service equipment and the first point of connection to service lateral.
3. Service EQUIPMENT- (same definition as for overhead service equipment)
Note: when distribution is overhead, the utility company usually secures the service drop
conductors to the building. All ddesign and construction beyond this point is the
responsibility of the owner , and the PEC regulations now apply. If distribution is from an
underground system, the underground service installation is usually made by the utility
company.
EE409 ELECTRICAL STANDARDS AND PRACTICE 2020-2021; 2ND Sem
Module 3 PEC Part 1
Engr. Rosalynn C. Hernandez
NOMINAL VOLTAGE- the lowest ratings of voltage under which a load can operate
under a normal condition.
Total voltage drop allowed : 5%, For feeders: 3% and for Branh Circuits:2-3%
Feeder- A set conductors that supply a group of branch circuit over current devices.
Branch Circuit- A set of conductors that extend beyond the last over current device in
the system.
Switch Board- A large frame assembly that contains a number of over current device for
feeder. It may also contain instruments and amy be accessible from both front and rear.
PANEL BOARD- A smaller assembly of over current devices, contained in a cabinet
and accesible only from the front. The over current devices up to a maximum of 48 (
excluding main CB), in this case 24 branch circuits (or feeders) for 1Ø and 16 branch
circuits (or feeders) for the case of 3Ø.
Activity No. 3
Prepare an example of electrical lay out using PEC
END of MODULE Exercises
Answer the following questions.
1. What is the service entrance?
2. What are the component of service entrance?
3. What is an electrical service drop?
4. Who is responsible for the service drop?
5. What are the three wires from pole to house?
6. What is the minimum size of wire to be used for service drop?
7. What is service eequipment in electrical?
8. What is service disconnecting?
9. What is the difference between disconnect switch and circuit breaker?
10. How many outlet can I put on a 15A breaker?
