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Exam 14: Services, Feeders, and Equipment

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Question 1

Multiple Choice

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Where ungrounded conductors are increased in size from the minimum size that has sufficient ampacity for the intended installation, wire-type, equipment grounding conductors (where installed) shall be increased in size ____, according to the circular mil area of the ungrounded conductors.

A) proportionately
B) inversely
C) directly
D) indirectly

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Question 2

Multiple Choice

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According to the NEC, live parts of electric equipment operating at 50 volts or more shall be guarded against ____ by approved enclosures.

A) water damage
B) overvoltage
C) accidental contact
D) phase transformations

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Question 3

Multiple Choice

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The alternating current phase arrangement on 3-phase busses are ____ from front to back, top to bottom, or left to right, as viewed from the front of the switchboard, switchgear, or panelboard.

Vertical wiring clearances apply to ____.

All mechanical elements used to terminate a grounding electrode conductor or bonding jumper to a grounding electrode shall be ____.

Overcurrent protection for transformers over ____ volts, nominal, is required.

A ____ is a large single panel, frame, or assembly of panels with front- or rear-mounted switches, protective devices (overcurrent, etc.) , buses, and, usually, instruments.

According to the NEC, where a panelboard is supplied through a transformer, the overcurrent protection required by 408.36 shall be located on the ____ side of the transformer.

Service equipment in other than dwelling units shall be legibly marked in the field with the ____.

Live generator parts operating at more than ____ volts to ground shall not be exposed to accidental contact by unqualified persons.

The maximum rating for an overcurrent protection on a primary unit is ____.

The connection between the grounded circuit conductor (neutral) and the equipment grounding conductor at the service is the ____.

Where the ungrounded supply conductors are larger than 1100 kcmil copper or 1750 kcmil aluminum, the supply-side bonding jumper shall have an area not less than ____ of the area of the largest set of ungrounded supply conductors or equivalent area for parallel supply conductors.

Equipment rated ____ amperes (or more) and over 6 ft (1.8 m) wide containing overcurrent devices, switching devices, or control are governed by specific entrance and egress requirements.

One access means to working spaces is permitted where the location provides ____.

Where rear access is required to work on nonelectrical parts at the back of enclosed equipment, a minimum working space of ____. horizontally is required.

No secondary overcurrent protection is required for certain transformers 1000 volts, nominal, or less with currents of at least 9 amperes and a maximum primary overcurrent protection of ____.

Ground-fault protection that functions to open the service disconnect will afford no protection from faults on the ____ of the protective element.

A structural ceiling may not ____.

A ____ minimum vertical clearance is required above finished grade for sidewalks, or from any platform or projection from which overhead conductors (of 150 volts, or less, to ground) might be reached.