NEC Article 625 Codes Quiz: Voltage and Power Supply
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Questions and Answers

What is the maximum nominal ac system voltage specified in NEC article 625?

  • 600 volts
  • 120/240 volts
  • 480 volts
  • 1000 volts (correct)

    • Which type of cord is required for cord-connected equipment according to 625.17(A)?

  • Jacketed cable
  • Hard service cord (correct)
  • Non-metallic sheathed cable
  • Mineral-insulated cable

    • What types of cords are listed for exposure to oil and damp and wet locations according to the NEC article 625?

  • Hard service cord, junior hard service cord, and portable power cable types (correct)
  • Mineral-insulated cord and armored cable
  • Non-metallic sheathed cord and jacketed cord
  • Bare conductor cord and lead-sheathed cable

    • What is the ampacity requirement for the cable of cord-connected equipment?

    <p>Specified in Table 400.5(A)(1)</p> Signup and view all the answers

    Where should the interrupting device of the personnel protection system be located to determine the maximum overall length of the power-supply cord?

    <p>Within the equipment enclosure</p> Signup and view all the answers

    What is the maximum overall length of the power-supply cord when the interrupting device is located within the equipment enclosure?

    <p>12 in.</p> Signup and view all the answers

    Which column of Table 400.5(A)(2) specifies the ampacity for 8 AWG and larger cords?

    <p>$75^\circ C$</p> Signup and view all the answers

    In which types of locations should the listed cords be suitable for exposure according to NEC article 625?

    <p>$60^\circ C$ wet and damp locations</p> Signup and view all the answers

    What is the highest nominal ac system voltage specified in NEC article 625?

    <p>$1000$ volts</p> Signup and view all the answers

    What is the ampacity requirement for 8 AWG and larger cords according to NEC article 625?

    <p>$90^\circ C$ columns of Table 400.5(A)(2)</p> Signup and view all the answers

    What is the overall length requirement for the power-supply cord when the interrupting device is not located within the equipment enclosure?

    <p>Not more than 24 in.</p> Signup and view all the answers

    Which table specifies the ampacity requirement for the cable of cord-connected equipment?

    <p>Table 400.5(A)(1)</p> Signup and view all the answers

    What is the minimum overall cord length allowed for the interrupting device of the personnel protection system specified in 625.22 when located at the attachment plug or within the first 300 mm (12 in.) of the power-supply cord?

    <p>1.2 m (4 ft)</p> Signup and view all the answers

    What type of flexible cable is specified for the output cable to the electric vehicle as per Table 400.4?

    <p>Type EV, EVJ, EVE, EVJE, EVT, or EVJT</p> Signup and view all the answers

    What is the maximum overall usable length allowed for the electric vehicle supply equipment or charging system without a cable management system?

    <p>7.5 m (25 ft)</p> Signup and view all the answers

    How should the usable length of the output cable be measured when the electric vehicle supply equipment or charging system is not fastened in place?

    <p>From the face of the attachment plug to the face of the electric vehicle connector</p> Signup and view all the answers

    For supplies less than 60 volts dc, what is the requirement for a personnel protection system against electric shock?

    <p>It is not required</p> Signup and view all the answers

    What is the requirement for each outlet installed for the purpose of charging electric vehicles?

    <p>It should have no other outlets on the same branch circuit</p> Signup and view all the answers

    What is the required overcurrent protection for feeders and branch circuits supplying equipment?

    <p>Sized for continuous duty and shall have a rating of not less than 125 percent of the maximum load</p> Signup and view all the answers

    When are electric vehicle charging loads considered to be continuous loads?

    <p>Always regardless of the amperage</p> Signup and view all the answers

    For equipment rated more than 60 amperes or more than 150 volts to ground, where should the disconnecting means be installed?

    <p>In a readily accessible location</p> Signup and view all the answers

    How should portable equipment be connected to premises wiring systems?

    <p>Through a nonlocking, 2-pole, 3-wire grounding-type receptacle outlet rated at 125 volt, single phase, 15 or 20 amperes</p> Signup and view all the answers

    What is required when energy cannot be back fed through the electric vehicle and the supply equipment to the premises wiring system upon loss of voltage from the utility?

    <p>A lockable disconnecting means</p> Signup and view all the answers

    Where can multiple feeder or branch circuits supply equipment?

    <p>They are permitted as long as identified for the application</p> Signup and view all the answers

    What is the requirement for the ventilation system for indoor electric vehicle charging locations?

    <p>It should include both supply and exhaust equipment and be permanently installed and located to intake from, and vent directly to, the outdoors</p> Signup and view all the answers

    What is the ground-fault circuit-interrupter protection requirement for single-phase receptacles used for electric vehicle charging?

    <p>Protection is required for receptacles rated 150 volts to ground or less and 50 amperes or less</p> Signup and view all the answers

    What type of enclosure is required for receptacles installed in a wet location for electric vehicle charging?

    <p>Weatherproof enclosure with the attachment plug cap inserted or removed</p> Signup and view all the answers

    What material should the primary pad base plate be made of?

    <p>Non-ferrous metal</p> Signup and view all the answers

    Where should the charger power converter be mounted if it is not integral to the primary pad?

    <p>At a height of not less than 450 mm (18 in.) above the floor level for indoor locations or 600 mm (24 in.) above grade level for outdoor locations</p> Signup and view all the answers

    What is the minimum enclosure rating required for the primary pad?

    <p>Minimum Type 3</p> Signup and view all the answers

    What is the requirement for securing the output cable to the primary pad?

    <p>It should be secured in place over its entire length to restrict its movement and prevent strain at the connection points</p> Signup and view all the answers

    What is the requirement for a personnel protection system against electric shock for supplies less than 60 volts dc?

    <p>A personnel protection system is not required for supplies less than 60 volts dc</p> Signup and view all the answers

    What is the maximum overall usable length allowed for the electric vehicle supply equipment or charging system without a cable management system?

    <p>75 ft</p> Signup and view all the answers

    When are electric vehicle charging loads considered to be continuous loads?

    <p>When they operate at or near maximum load continuously for more than 3 hours within a 4-hour period</p> Signup and view all the answers

    Study Notes

    NEC Article 625: Electric Vehicle Charging System Equipment

    • The maximum nominal AC system voltage specified in NEC Article 625 is 300 volts AC.
    • Cord-connected equipment requires a nominal voltage-rated cord according to 625.17(A).

    Cord Requirements

    • Cords are listed for exposure to oil and damp and wet locations according to NEC Article 625.
    • The ampacity requirement for the cable of cord-connected equipment is specified in Table 400.5(A)(2).
    • Column 3 of Table 400.5(A)(2) specifies the ampacity for 8 AWG and larger cords.

    Power Supply Cord and Interrupting Device

    • The interrupting device of the personnel protection system should be located to determine the maximum overall length of the power-supply cord.
    • The maximum overall length of the power-supply cord is 25 feet when the interrupting device is located within the equipment enclosure.
    • When the interrupting device is not located within the equipment enclosure, the overall length requirement for the power-supply cord is 17 feet.

    Locations and Conditions

    • Listed cords should be suitable for exposure to damp and wet locations according to NEC Article 625.
    • The highest nominal AC system voltage specified in NEC Article 625 is 300 volts AC.

    Electric Vehicle Supply Equipment and Charging System

    • The output cable should be suitable for exposure to oil and damp and wet locations.
    • The minimum overall cord length allowed for the interrupting device of the personnel protection system is 1 foot when located at the attachment plug or within the first 12 inches of the power-supply cord.
    • Flexible cable is specified for the output cable to the electric vehicle as per Table 400.4.
    • The maximum overall usable length allowed for the electric vehicle supply equipment or charging system without a cable management system is 25 feet.
    • The usable length of the output cable should be measured from the attachment plug to the furthest point of the cable when the electric vehicle supply equipment or charging system is not fastened in place.

    Safety Requirements

    • A personnel protection system against electric shock is required for supplies less than 60 volts DC.
    • Each outlet installed for the purpose of charging electric vehicles should have overcurrent protection.
    • Electric vehicle charging loads are considered continuous loads.
    • For equipment rated more than 60 amperes or more than 150 volts to ground, the disconnecting means should be installed at a readily accessible location outside the enclosure.

    Additional Requirements

    • Portable equipment should be connected to premises wiring systems using a permanently installed receptacle.
    • When energy cannot be back fed through the electric vehicle and the supply equipment to the premises wiring system upon loss of voltage from the utility, additional safety measures are required.
    • Multiple feeder or branch circuits can supply equipment from a single electric vehicle charging system.
    • The ventilation system for indoor electric vehicle charging locations should be designed to prevent the accumulation of flammable gases.
    • Single-phase receptacles used for electric vehicle charging should have ground-fault circuit-interrupter protection.
    • Receptacles installed in a wet location for electric vehicle charging should be in a watertight enclosure.
    • The primary pad base plate should be made of a non-conductive material.
    • If the charger power converter is not integral to the primary pad, it should be mounted within the primary pad enclosure or within 3 feet of the primary pad.
    • The minimum enclosure rating required for the primary pad is IP67.
    • The output cable should be secured to the primary pad to prevent strain relief.

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    Related Documents

    NEC Article 625 Codes for SAE (October 2021) PDF

    Description

    Test your knowledge of NEC Article 625 codes related to system voltages and power-supply cords. This quiz covers topics such as nominal AC and DC system voltages, as well as requirements for power-supply cords and cables.

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