What should be the contents of my Electrical Plan? -Based on PEC 2017

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1.3.1 General Drawing Sheet Sizes.

  1. Electrical plans and drawings shall be drawn on drawing sheets of the following standard sizes:
    • 760 mm x 1000 mm
    • 600 mm x 900 mm
    • 500 mm x 760 mm
  2. In cases such as projects of large magnitude, exemption in the use of the standard drawing sheets may be granted by the office of the local building official.
  3. For a dwelling unit having a floor area of not more than 50 square meters with a total load not exceeding 3680 VA, a drawing sheet of size 297 mm x 420 mm (A3 size) is permitted. Drawing Scale.

Appropriate metric drawing scales shall be used. Graphic Scale.

Since the size of the drawing sheet can be changed photographically, graphic scale shall be shown on each drawing sheet. 

FPN: Graphic scale denotes nominal or average plan scale and remains true when plans are photographically reduced.

1.3.2 Plans and Specifications Plan Requirements.

(A) Location and Site Plans.

Location and site plans, with proposed structure and owner’s land drawn to appropriate metric scale shall show:

  1. Bordering areas showing public or well-known streets, landmarks and/or structures which need not be drawn to scale unless they extend into the area concerned;
  2. Location of service drop, service equipment and nearest pole of the utility company furnishing electrical energy; location of the meter as well as sizes of service entrance wires, conduits and service equipment; and
  3. Clearance of the path or run of service drops and entrance wires to adjacent existing and/or proposed structures.

(B) Legend or Symbols. Refer to Appendix A – Electrical Symbols

(C) General Notes and/or Specifications.

General Notes and/or Specifications, written on the plans or submitted on separate standard size sheets shall show:

  1. Nature of electrical service, including number of phases, number of wires, voltage and frequency;
  2. Type of wiring;
    1. Service entrance
    2. Feeders, sub-feeders and branch circuit wires for lighting and/or power load
    3. Fire alarm system, if required by law
    4. Signaling and communication
  3. Special equipment to be installed, indicating ratings and classification of service or duty cycle of;
    1. Rectifiers
    2. Heaters
    3. X-ray apparatus
    4. Electric welding equipment
    5. Others
  4. System or method of grounding;
  5. Type and rating of main disconnecting means, overcurrent protection (OCP) and branch circuit wiring;
  6. Clearances of service drop, burial depth for service lateral, mounting height and clearance for service equipment, mounting height and clearance for kWh meter.

(D) Electrical Layout.

Floor plan showing location of equipment and devices, and their interconnection wiring.

(1) Plan for Power. Layout and wiring plans for power on the floor plans drawn to scale, shall show:

  1. Sizes and location of service entrance conductors, raceways, metering equipment, main switchboard, layout of feeders and distribution panels or switches and their sizes, types and ratings;
  2. Complete circuits of motors and other electrical equipment, their controlling devices, their locations and ratings;
  3. Complete wiring of emergency power system, if any;
  4. Nature of processes/activities carried out in each room or area

FPN: In residences, apartment houses and small commercial establishments, layout of equipment and motors of one horsepower or less may be incorporated in the layout for General Lighting and Receptacle Outlets. In general, layout of motors and power outlets not exceeding a total often, may be included in the lighting layout provided such inclusion will not make reading, interpretation and/or checking of said plan difficult.

(2) Plan for Lighting and Receptacle Outlets. Layout and wiring plans for general lighting and receptacle outlets on floor plans drawn to scale, shall show:

  1. Location, type and rating of lighting fixtures, indicating illumination in lux in each room or area. In residences, hotels, apartment houses, and churches, the illumination level in each room or area need not be shown nor computed;
  2. Location of switches for each fixtures or group of fixtures;
  3. Location of receptacle outlets and appliances to be served and their ratings;           
  4. Complete circuits of the lighting and receptacle outlets;
  5. Complete wiring of emergency lighting system, if any;
  6. A separate drawing showing layout of receptacle outlets may be made at the discretion of the design engineer.

(3)  Plan for Fire Alarm Circuits. Layout and wiring plans of fire alarm station, fire alarm bell, fire alarm control panel, and other shall be drawn to scale and show:

  1. Location of outlets, equipment and/or apparatus and controls;
  2. Complete circuit showing no. and size of raceway and wire;

E) Schedule of Loads. Schedule of load in tabulated form shall indicate:

(1) Motor Loads;

  1. Motors as numbered or identified in power layout
  2. Type of motor
  3. Horsepower/kilowatt/kilovolt ampere rating
  4. Voltage rating
  5. Full-load current rating
  6. Frequency rating other than 60 hertz
  7. Number of phases
  8. Type and size of wiring
  9. Protective device rating

(2) Lighting and Receptacle Loads;

  1. Panel as numbered in the feeder diagram
  2. Circuit designation number
  3. Number of lighting outlets in each circuit
  4. Number of switches in each circuit
  5. Number of receptacles outlets (convenience outlets)
  6. Voltage of circuit
  7. Type and size of wiring
  8. Protective device rating

(3) Other Loads.

  1. Designation number on plan
  2. Description of load
  3. Classification of service duty, if required
  4. Rating of kilovolt-ampere or kilowatt
  5. Phase loading indicating full load line current
  6. Voltage rating
  7. Type and size of wiring
  8. Protective device rating