Philippine Electrical Code (PEC) Quiz

Electrical Installation and Safety

• Maximum electrical trade size of intermediate conduit is 200 mm.
• Before starting any installation work, alteration, repair or extension on any electrical system, an Electrical Permit is needed.
• The Philippine Electrical Code (PEC) is mandatory for applications by government bodies exercising legal jurisdiction over electrical installation.

Hazardous Locations

• Equipment for installation in hazardous locations must be tested and approved for use according to the classification of the hazards involved, and are divided into 3 groups.

Electrical Conductors

• Individual branch circuits using type FCC (flat conductor cable) shall have ratings not exceeding 20 A.
• Type UF (underground feeder) cable is applicable for underground service entrance conductors.

Installation Clearance

• Bending space at each terminal shall not be less than 300 mm, provided the conductors do not enter or leave the enclosure through the wall opposite its terminals.
• A clearance of not less than 13 mm shall be secured between bare current carrying metal parts and any metal surface of an auxiliary gutter.
• No box shall have an internal depth of less than 12 mm.

Electrical Devices

• A Pendant is a device or equipment which is suspended from overhead either by means of a flexible cord carrying the current, or otherwise.

Motor Circuits

• In the schedule of loads for motor circuits, the type of motor, motor’s manufacturer, and motor as numbered or identified in the power layout are included.

Electrical Conductors Ampacity

• The allowable ampacity of THW insulated copper conductor with an area of 8.0 mm² and exposed to an ambient temperature of 30°C is 30 A.
• For two conductors inside the conduit, the ampacity of the conductors shall be derated to 80%.

Mounting Electrical Equipment

• Electrical equipment may be best mounted on a concrete wall using an expansion bolt.

Neutral Load

• The neutral load of a range that has a demand load of 10.4 kW is 7.28 kW.

Electrical Permit

• If the project is expensive and requires more time for checking and for computations of fees, the issuance of the electrical permit need not be issued immediately, but the delay shall not be longer than 5 working days.

Splices in Ground Conductors

• Splices in ground conductors shall be as few as practicable and shall be attached so as to withstand a pull test of 880 Newton.

Hazardous Locations Classification

• Locations which are hazardous because of the presence of combustible dust are classified as Class II.

Electrical Conductors Ampacity (Buried Underground)

• A THW insulated copper conductor with a cross-sectional area of 3.5 mm² and buried underground has an ampacity of 15 A at an ambient temperature of 30°C.

Lighting Protection System

• All extended parts located within 1,600 mm of the lighting protection system shall be bonded thereto.

Duty Classification

• Operation at substantially constant load for an indefinitely long time is classified as Continuous duty.

Transformer Location

• Transformer exceeding 112.5 kVA shall not be located within 3 feet from combustible materials of the building.