grounding and bonding review
2" (50mm) of concrete
A concrete-encased electrode used for service grounding must be covered with a minimum of?
5A
A single-phase system has two legs, Leg A and Leg B. If Leg A is carrying 35A and Leg B is carrying 30A,the current carried by the neutral is?
aluminum
All of the following are suitable materials for ground rods, except______.
4/0 service conductors
Assuming the use of 75 Celsius copper conductors, a 230A commercial service would require
4AWG copper
If you are bonding multiple disconnects and the size of the service-enterance conductor is 3/0, the size of the bonding jumper is ______.
Ungrounded conductor
Item B in figure RQ01 represents the?
grounded conductor
Item C in figure RQ01 represents the ?
main bonding jumper
Item F in figure RQ01 represents the?
neutral bus in the main panelboard
Residential electrical service are grounded by connecting the grounded conductor to grounding electrode at the?
14 AWG copper
The EGC for a flexible metal conduit connection to a motor supplied with a 15A circuit is_____.
short circuit
The conducting connection, whether intentional or accidental,between any of the conductors of an electrical system is known as a?
2 AWG copper
The main bonding jumper for 4/0 service conductors is _____.
5' (1.5m)
The maximum distance allowed by the NEC to connect a grounding conductor to a water pipe after the pipe enters the building is _______.
3' (1 m)
Touch voltage extends to a distance of approximately_______.
bonding jumper
When a metal water pipe is used as a grounding electrode, what must be provided around the water meter?
neutral
Which conductor(s) are grounded on a single-phase, three-wire,120/240Vsystem?
No. 4
Which of the following copper AWG sizes should be used for the grounding conductor for a 200A service using 3/0 copper conductors?
An underground gas line
Which of the following is an NEC violation when used as a grounding electrode?
a grounding clip
Which of the following is used to connect a ground rod with a grounding conductor?
grounded electrode conductor
item E in figure RQ01 represents the?
