Exam 14: Services, Feeders, and Equipment

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

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

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.

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

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.

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

A drip loop's lowest point has a minimum vertical clearance of ____.

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.

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

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

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

A structural ceiling may not ____.

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.

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 ____.

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.

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.

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.

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.