Registered Master Electrician Licensure Examination Quiz
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Questions and Answers

Which of the following standards must be met if a feeder conductor carries the total load supplied by the service conductors with an ampacity of 50 amps?

  • The feeder ampacity must be greater than the service conductor ampacity (correct)
  • The feeder ampacity must be less than the service conductor ampacity
  • The feeder ampacity must be 30 amps
  • None of the above

Where more than one building exists on the same property under single management, which of the following are additional feeders or branch circuits permitted to supply?

  • Optional standby systems
  • Fire pumps
  • Parallel power production systems
  • All of the above (correct)

Which of the following is true regarding the use of 5-wire feeders?

  • It is permitted to use a common neutral (correct)
  • It is restricted to installations over 600 volts nominal
  • It is prohibited
  • It requires that the overcurrent device protection be 100% of the continuous load

Which of the following must be included in a DC power system located on the premises?

<p>All of the above (D)</p> Signup and view all the answers

Which of the following methods can be used to consider the non current-carrying metal parts of equipment as effectively grounded?

<p>If it is secured to the structural metal frame of a building (A)</p> Signup and view all the answers

What is the minimum number of GFCI receptacles that must be installed within 3 feet of the washing machine location?

<p>2 (A)</p> Signup and view all the answers

For a 30 amp receptacle connected to a 30 amp branch circuit supplying two or more outlets, what is the maximum total cord-and-plug load allowed?

<p>16 amps (A)</p> Signup and view all the answers

Which of the following can be used as an equipment grounding conductor when run with circuit conductors?

<p>All of the above (D)</p> Signup and view all the answers

Circuits between 120-277 volts can supply power to which of the following?

<p>Both A and B (B)</p> Signup and view all the answers

What is the minimum size for a 20 amp branch circuit copper conductor?

<p>$3.5,\text{mm}^2$ copper (D)</p> Signup and view all the answers

Which requirement(s) must restricted-access, adjustable-trip circuit breakers meet?

<p>All of the above (D)</p> Signup and view all the answers

What receptacle requirement applies to the laundry area in a single-family dwelling unit?

<p>At least one receptacle (A)</p> Signup and view all the answers

According to the Philippine Electrical Code, if a single non-motorized equipment receptacle is fed by an individual 30 amp branch circuit, the receptacle amperage rating must be:

<p>30 amps (B)</p> Signup and view all the answers

When conductors are run in parallel raceways, the equipment grounding conductors must:

<p>Run in parallel in each raceway (A)</p> Signup and view all the answers

For a surge arrester with a nominal voltage rating of less than 1000 volts, the minimum size of the grounding conductor should be:

<p>$5.5 ; \mathrm{mm}^2$ (B)</p> Signup and view all the answers

In a building with multiple nominal voltage systems, ungrounded feeder conductors must be:

<p>Separately identified (A)</p> Signup and view all the answers

According to the Philippine Electrical Code, which of the following statements is true regarding the installation of electrical equipment?

<p>All electrical equipment must be installed in accordance with the manufacturer's instructions. (A)</p> Signup and view all the answers

Which of the following is a requirement for the installation of electrical conductors in the Philippine Electrical Code?

<p>Conductors must be installed in a manner that prevents damage and minimizes the risk of fire. (B)</p> Signup and view all the answers

Where are grounded conductors required to be insulated?

<p>All of the above (D)</p> Signup and view all the answers

What is the requirement for the metal disconnecting means at a remote building supplied by a feeder with an equipment grounding conductor?

<p>Grounded to a grounding electrode (C)</p> Signup and view all the answers

What is the required ampacity for circuit conductors supplying power conversion equipment included as part of an adjustable-speed drive system?

<p>Not less than 125 percent of the rated input to the power conversion equipment (B)</p> Signup and view all the answers

What is the required ampere rating for the disconnection means for a 400 volt motor circuit?

<p>Not less than 115 percent of the full-load current rating of the motor (C)</p> Signup and view all the answers

Which requirement must be met for a 15 amp receptacle installed in a wet location?

<p>All of the above (D)</p> Signup and view all the answers

If a feeder supplies a remote building with an equipment grounding conductor, what is the proper installation method for the metal disconnecting means?

<p>Grounded to a grounding electrode (C)</p> Signup and view all the answers

Which statement accurately describes a requirement for equipment installation?

<p>All of the above are valid requirements for equipment installation. (D)</p> Signup and view all the answers

When using a transformer to create a three-phase, four-wire distribution system from a three-phase, three-wire ungrounded system, which of the following installation requirements must be met?

<p>The transformer must not be provided with independent overcurrent protection. (B)</p> Signup and view all the answers

What is the purpose of the installation requirements mentioned in the text?

<p>To prevent unauthorized access to potentially dangerous equipment. (A)</p> Signup and view all the answers

If a transformer is used to create a three-phase, four-wire distribution system, which of the following statements is true?

<p>The transformer must be connected to ungrounded phase conductors. (A)</p> Signup and view all the answers

Which of the following is NOT a requirement for installing equipment?

<p>Equipment must be installed in a locked room. (B)</p> Signup and view all the answers

Flashcards

Washing Machine Receptacle Requirement

At least one electrical outlet must be placed within 3 feet of the location where the washing machine will be installed.

GFCI Receptacle Requirement

A minimum of two Ground Fault Circuit Interrupter (GFCI) receptacles are required in the electrical system.

Feeder Ampacity Requirement

If the feeder conductor carries the full load supplied by the service conductors (with an ampacity of 50 amps), the feeder's ampacity must be higher than the service conductor's ampacity.

Additional Feeders for Standby Systems

Additional feeders or branch circuits are allowed to supply optional standby systems (like generators), fire pumps, and power production systems (like solar panels), particularly when multiple buildings share a single management.

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DC Power System Grounding

Direct current (DC) power systems on a property must include a grounding connection at the power source, a grounding electrode conductor (at least #10 AWG wire), and a grounding ring.

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Equipment Grounding Requirement

The metal parts of electrical equipment that don't carry current must be grounded using a separate conductor, running in its own protective conduit.

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Equipment Grounding Conductor Materials

An equipment grounding conductor that runs alongside circuit conductors can be made of solid copper busbar, flexible metal conduit, or liquid-tight conduit.

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Permitted Circuit Voltages

Circuits with voltage between 120 and 277 volts (excluding the ground wire) can power specific lighting equipment, like those with mogul-base lamp holders.

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Minimum Wire Size for 20 Amp Branch Circuit

The minimum size copper wire required for a 20 amp branch circuit is 3.5 square millimeters.

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Receptacle Amperage Match for Branch Circuit

A 30 amp branch circuit supplying a single non-motorized equipment receptacle must have a receptacle rating of 30 amps.

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Laundry Area Receptacle Requirement

A single-family dwelling unit's laundry area must have at least one electrical outlet.

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Parallel Grounding Conductors

When conductors are running in parallel raceways, their equipment grounding conductors must also run parallel in each raceway.

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Surge Arrester Grounding Conductor Size

A surge arrester (providing protection from voltage spikes) with a nominal voltage under 1000 volts must have a ground connecting conductor with a minimum cross-sectional area of 3.5 square millimeters.

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Identifying Ungrounded Feeder Conductors

When a building has multiple electrical systems with different nominal voltages, the ungrounded feeder conductors for each system must be clearly marked to distinguish them.

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Disconnecting Means Location

For a remote building supplied by a feeder with an equipment grounding conductor, the metal disconnecting means should be connected on the load side of the feeder.

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Adjustable-Speed Drive System Circuit Conductors

The circuit wires powering the power conversion equipment in an adjustable-speed drive system (used to adjust the speed of motors) must have an ampacity of at least 125 percent of the motor’s full-load current.

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Motor Circuit Disconnection Means Requirements

The disconnection means for a 400 volt motor circuit must have an amp rating of at least 125 percent of the motor's full-load current.

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Wet Location Receptacle Requirements

A 15 amp electrical outlet installed in a wet location (exposed to water or moisture) must meet specific requirements to ensure safety.

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Restricted Access Equipment Requirements

Equipment in restricted access areas (only accessible to qualified personnel) requires specific installation requirements.

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Transformer Requirements for Three-Phase Systems

When a transformer is used to create a three-phase, four-wire distribution system from a three-phase, three-wire ungrounded system, specific installation requirements need to be met.

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Three-Phase, Four-Wire System Overcurrent Protection

A three-phase, four-wire ungrounded system is not allowed to provide overcurrent protection to a three-phase, four-wire system or to be switched.

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Transformer Connection Requirements

The transformer in a three-phase, four-wire system must be directly connected to the ungrounded phase conductors.

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Specific Transformer Connection and Protection Requirements

Using a transformer to create a three-phase, four-wire system, the transformer must be connected to the ungrounded phase conductors, must not be switched, and must not be provided with independent overcurrent protection, but rather utilize common-trip overcurrent protection for the three-phase, four-wire system.

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Feeder Ampacity Requirement

A feeder conductor carrying the full load supplied by service conductors that have an ampacity of 50 amps must have a greater ampacity.

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Identifying Ungrounded Feeder Conductors

When a building contains multiple electrical systems with different nominal voltages, the ungrounded feeder conductors should be clearly labeled.

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Surge Arrester Grounding Conductor Size

A surge arrester with a nominal voltage below 1000 volts should have a ground connecting conductor with a minimum cross-sectional area of 3.5 square millimeters.

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Motor Circuit Disconnection Means Requirements

The disconnect means for a 400 volt motor circuit should have an amp rating of at least 125 percent of the motor's full-load current.

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Study Notes

Electrical Code Requirements

  • At least one receptacle must be installed within 3 feet of the washing machine location.
  • A minimum of two GFCI receptacles are required.

Feeder Conductors

  • If a feeder conductor carries the total load supplied by the service conductors with an ampacity of 50 amps, the feeder ampacity must be greater than the service conductor ampacity.
  • Additional feeders or branch circuits are permitted to supply optional standby systems, fire pumps, and parallel power production systems in cases where more than one building exists on the same property under single management.

DC Power Systems

  • DC power systems located on the premises must include a grounding connection at the power source, a grounding electrode conductor which is at least #10 AWG, and a grounding ring.

Equipment Grounding

  • The non-current-carrying metal parts of equipment shall be considered effectively grounded by use of a separate grounded circuit conductor, running in a separate raceway.
  • An equipment grounding conductor that is run with circuit conductors is permitted to be a solid copper busbar, flexible metal conduit, or liquid-tight conduit.

Circuit Voltages

  • Circuits over 120 volts but not exceeding 277 volts between conductors are permitted to supply power to auxiliary equipment of electric-discharge lamps mounted in permanently installed fixtures, luminaries equipped with mogul-base screw shell lamp holders, and screw shell type lamp holders.

Branch Circuits

  • The minimum size copper circuit wire for a 20 amp branch circuit conductor is 3.5 sq mm copper.
  • A 30 amp branch circuit feeding a single non-motorized equipment receptacle must have a receptacle amperage of 30 amps.

Laundry Area

  • The laundry area in a single-family dwelling unit must have at least one receptacle.

Parallel Conductors

  • Conductors run in parallel raceways must have equipment grounding conductors which are run in parallel in each raceway.

Surge Arresters

  • A surge arrester of less than 1000 volts nominal shall have a ground connecting conductor which is no smaller than 3.5 sq mm.

Ungrounded Feeder Conductors

  • When there is more than one nominal voltage system in the building, ungrounded feeder conductors must be separately identified.

Disconnecting Means

  • The metal disconnecting means at a remote building, supplied by a feeder with an equipment grounding conductor, is required to be connected on the service load side of the feeder.

Adjustable-Speed Drive Systems

  • Circuit conductors that supply power conversion equipment included as part of an adjustable-speed drive system must have an ampacity of at least 125 percent of the motor’s full-load current.

Motor Circuits

  • The disconnection means for a 400 volt motor circuit must have an ampere rating of at least 125 percent of the motor’s full-load current.

Wet Locations

  • A 15 amp receptacle installed in a wet location must meet installation requirements, including being protected from rain or water runoff, having an attachment plug cap inserted, and having an enclosure that is weatherproof.

Restricted Access

  • Equipment installed in a room that is only accessible to a qualified person, or equipment installed on a balcony that is elevated enough to prohibit access by unqualified people, or equipment installed or mounted at least 8 feet above floor level, is considered restricted access.

Transformers

  • When a transformer is used to create a three-phase, four-wire distribution system from a three-phase, three-wire ungrounded system, the transformer must meet installation requirements, including not being switched, being directly connected to the ungrounded phase conductors, and not being provided with overcurrent protection that is independent from the main switch and common-trip overcurrent protection for a three-phase, four-wire system.

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Test your knowledge on the Philippine Electrical Code with this quiz for the Board of Electrical Engineering Registered Master Electrician Licensure Examination. Select the correct answer for each question by marking only one answer on the provided answer sheet.

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