Exam 14: Services Feeders and Equipment

A structural ceiling may not ____.

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

According to the NEC , live parts of electric equipment operating at 50 to 1000 volts, nominal, shall be guarded against ____ by approved enclosures.

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

Where ungrounded conductors are increased in size for any reason other than as required in 310.15(B) or 310.15(C), wire-type equipment grounding conductors (where installed) shall be increased in size ____, according to the circular mil area of the ungrounded conductors.

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.

The ____ phase must be that phase having the higher voltage to ground on 3-phase, 4-wire, delta-connected systems.

Premises wiring (system) is defined as ____, including power, lighting, control, and signal circuit wiring together with all their associated hardware, fittings, and wiring devices, both permanently and temporarily installed.

A system that supplies a ____ and is derived from a transformer rated no more than 1000 volt-amperes does not require a grounding electrode conductor.

Equipment rated ____ amperes (or more) and over 6 ft (1.8 m) wide requires an entrance to and egress from the required working space at least 24 in.(610 mm) wide and 6½ ft (2.0 m) high at each end of the working space.

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

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

A(n) ____ 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.

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

Vertical wiring clearances apply to ____.

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

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.

All panelboards shall have a rating not less than the ____ required for the load calculated in accordance with Part III, IV, or V of Article 220.

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

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