Exam 7: Introduction to Residential Service Entrances

A __________ is a conducting object through which a direct connection to the earth is established.

Section 250.4(A) explains that electrical systems are grounded to limit the voltage imposed by lightning, line surges, or unintentional contact with higher-voltage lines and to ________ the voltage to earth during normal operation.

When a metal underground water pipe is used as a grounding electrode, it must be in contact with the earth for at least __________ feet.

A ground rod cannot be driven completely into the ground because of large rocks in the soil.Explain what options you have to meet NEC requirements.

The wiring methods allowed for underground service entrance installations are listed in Section 230.30(B).They include rigid metal conduit (RMC), intermediate metal conduit (IMC), __________, and USE conductors or cables.

A transformer designed to be mounted directly on a foundation at ground level is called a(n) ____________________________.

The NEC requires a vertical clearance of at least __________ feet above public streets, alleys, roads, and parking areas subject to truck traffic.

When bonding together the noncurrent-carrying metal parts of a service entrance, which of the following methods may be used?