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PEC Part 1: general requirements: board exam questions with solutions

On the REE exam under Engineering Sciences and Allied Subjects (ESAS) and the RME exam under Philippine Electrical Code, Parts 1 and 2. Try each question before you open its solution.

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Questions

1. Under the Philippine Electrical Code, a load where the maximum current is expected to continue for how long or more is classified as a continuous load?

  1. 3 hours
  2. 1 hour
  3. 8 hours
  4. 24 hours
Show the answer and solution

Answer: A. 3 hours

Article 1.1 defines a continuous load as one where the maximum current is expected to continue for 3 hours or more.

Reference: PEC 2017 Part 1, Art. 1.1 (Definitions: Continuous Load)

2. A 230 V panelboard (150 V or less to ground) has exposed live parts on one side and no live or grounded parts on the other side of the working space. What is the minimum depth of the working space in front of it?

  1. 600 mm
  2. 1200 mm
  3. 900 mm
  4. 1500 mm
Show the answer and solution

Answer: C. 900 mm

Table 1.10.2.1(a)(1) gives a 900 mm minimum working-space depth for 0 to 150 V to ground in all conditions.

Reference: PEC 2017 Part 1, 1.10.2.1(a)(1) and Table 1.10.2.1(a)(1)

3. What minimum headroom does the PEC require for the working space about low-voltage service equipment, switchboards and panelboards (excluding the existing-dwelling exception)?

  1. 1.8 m
  2. 2.5 m
  3. 3.0 m
  4. 2.0 m
Show the answer and solution

Answer: D. 2.0 m

The minimum headroom of working spaces about service equipment, switchboards, panelboards and motor control centers is 2.0 m (2000 mm).

Reference: PEC 2017 Part 1, 1.10.2.1(e)

4. On a 4-wire delta system where the midpoint of one phase winding is grounded, how must the conductor with the higher phase voltage to ground (the high leg) be identified where the grounded conductor is also present?

  1. Orange color or other effective marking
  2. Green color
  3. White or gray color
  4. Blue color
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Answer: A. Orange color or other effective marking

The high leg must be durably and permanently marked by an outer finish that is orange in color or by other effective means.

Reference: PEC 2017 Part 1, 1.10.1.15

5. As used in the Philippine Electrical Code, the term "approved" means:

  1. Listed by any testing laboratory
  2. Acceptable to the authority having jurisdiction
  3. Recommended by the manufacturer
  4. Used in at least one previous installation
Show the answer and solution

Answer: B. Acceptable to the authority having jurisdiction

Article 1.1 defines approved as acceptable to the authority having jurisdiction. Listing by a laboratory is a separate term.

Reference: PEC 2017 Part 1, Art. 1.1 (Definitions: Approved)

6. During inspection, a panelboard is found with an unused knockout opening. What does the PEC require?

  1. It may be left open if the panel is indoors
  2. It must be covered with electrical tape
  3. The unused opening must be closed so as to give protection substantially equivalent to the wall of the equipment
  4. It is acceptable as ventilation for the panel
Show the answer and solution

Answer: C. The unused opening must be closed so as to give protection substantially equivalent to the wall of the equipment

Unused openings other than those for mounting or for the operation of equipment must be effectively closed with protection substantially equivalent to the wall of the equipment.

Reference: PEC 2017 Part 1, Art. 1.10 (Requirements for Electrical Installations)

7. According to the PEC definition, a branch circuit is made up of the circuit conductors located between:

  1. The service point and the service equipment
  2. The service equipment and the final branch-circuit overcurrent device
  3. The utility transformer and the meter
  4. The final overcurrent device protecting the circuit and the outlet(s)
Show the answer and solution

Answer: D. The final overcurrent device protecting the circuit and the outlet(s)

Article 1.1 defines a branch circuit as the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). Conductors between service equipment and the final branch-circuit device are feeders.

Reference: PEC 2017 Part 1, Art. 1.1 (Definitions: Branch Circuit)

Other topics in the same subjects

Physics: mechanics · Physics: waves, electricity and magnetism · General chemistry · Thermodynamics · Fluid mechanics · Strength of materials · Engineering materials · Engineering economics · Engineering management · Computer fundamentals and programming · RA 7920 and ethics (electrical) · PEC: wiring methods and materials · PEC: branch circuits, ampacity and protection · PEC: grounding and bonding · PEC: special occupancies and equipment

An independent, free reviewer: not affiliated with the PRC or the Boards. Subject weights and passing rules are from the PRC examination programs and the laws (RA 9292, RA 7920); check the current PRC program before you file. Code questions follow the Philippine Electrical Code 2017 Part 1; check them against your own copy of the Code.