Exam 27: Service-Entrance Equipment

NEC 300.4(F) states that if ____ AWG or larger ungrounded circuit conductors enter a cabinet, box enclosure or raceway, an insulating bushing or equivalent must be used.

Ground rods must be at least ____ ft. in length

When using a metal water pipe as a grounding electrode, a(n) ____________________ is required.

NEC ____________________ provides rules for working space around electrical equipment.

____________________ conductors are permitted to be attached to and supported by the service mast.

Ground clamps used for bonding and grounding must be ____.

It is extremely important that a disconnect or panelboard used as service equipment be marked "____________________."

A panelboard must not be installed in a(n) ____________________.

A 4 AWG bare copper conductor at least 20 ft (6.0 m) long installed identically to the steel reinforcing rod is also permitted as a concrete-encased grounding electrode. This is often referred to as a(n) ____________________ ground.

A main service disconnect shall not be installed in a ____.

What are service lateral conductors?

A working space not less than ____ in. wide and 3 ft deep must be provided in front of electrical equipment, such as panelboards A and B in this residence.

What is a service drop?

Bonding at service-entrance equipment is very important because service-entrance conductors do not have ____________________ at their line side, other than the electric utility company's primary transformer fuses.

For a one-family residence, the minimum size main service disconnecting means is ____ three-wire.

Using an electric rate of $0.07824 per kWh, calculate the cost of running ten 100W lamps for six hours.

If extra support is not to be provided, the mast service conduit must be at least ____ in. in diameter.

For typical residential wiring, the grounding electrode conductor is run between the ____________________ neutral/ground terminal bar and the grounding electrode system.

An exterior raceway containing service entrance conductors must be ____________________ and arranged to drain.

Under no circumstances shall the service entrance conductors be less than ____ ft. above finished grade.