Grounding and bonding section

If the voltage drop between a grounding electrode and an auxiliary potential electrode is 10V and a current of 10A is passed between an auxiliary current electrode and the grounding electrode, then the resistance is

1 ohm

The EGC for a flexible metal conduit connection to a motor supplied with a 20A circuit is

12 AWG

If you are bonding multiple disconnects and the size of the service conductor is 1,000 kcmil in a wire way, the size of the bonding jumper is

2/0 copper

Assuming the use of 75 Celsius copper conductors, a 200A commercial service would require

3/0 service conductor

The main bonding jumper for 3/0 service conductor is

4 AWG copper

A single-phase system has two legs, Legs A and Leg B. If Leg A is carrying 50A and Leg B is carrying 45A, the current carried by the neutral is

5A

When an equipment bonding jumper is installed outside, the length is limited to not more than

6 feet (1.8m)

When completing a three-point test, the potential electrode is placed at

62% of the current electrode distance

Which of the following is considered a separately derived system?

An emergency standby system with an isolated neutral

A ground rod must be installed in a coastal location and can only be driven halfway before encountering a rock shelf. One alternative is to

Bury the rod in a trench at least 30" (750mm) deep

Suppose a loose connection has an exposed bare conductor and it contacts the edge of a metal enclosure. Is this an example of a short circuit or ground fault

Ground fault

When using nonmetallic boxes with Type NM cable, the grounding wire

In not required to be connected to the box

When grounding at more than one building, the GEC at the second building is sized using

NEC Table 250.66