NCCER 209 UPDATED EXAM QUESTIONS AND
CORRECT ANSWERS
The fall-of-potential method is used to measure _____. - CORRECT ANSWERS earth
resistance
Which of the following is TRUE when installing grounding at more than one building? - CORRECT
ANSWERS The grounded circuit conductor and the equipment grounding conductor must
both be extended to the second building.
The key to successfully clearing ground fault currents is _____. - CORRECT
ANSWERS electrical continuity
The bonding jumper for multiple disconnecting means is located _____. - CORRECT
ANSWERS on the supply side of the service disconnect
A transformer bonding jumper is routed with the feeder conductors from the transformer to the
equipment grounding bar in the panel and is known as a(n) _____. - CORRECT
ANSWERS supply-side bonding jumper
When a new grounding system has been installed, it is advisable to conduct baseline three-
point tests every _____. - CORRECT ANSWERS season for the first year
A transformer-supplied system operating at less than 50V must be grounded if the supply
voltage to the transformer exceeds _____. - CORRECT ANSWERS 150V to ground
A ground tester can be used to measure the value of a grounding electrode's _____. - CORRECT
ANSWERS resistance
CORRECT ANSWERS
The fall-of-potential method is used to measure _____. - CORRECT ANSWERS earth
resistance
Which of the following is TRUE when installing grounding at more than one building? - CORRECT
ANSWERS The grounded circuit conductor and the equipment grounding conductor must
both be extended to the second building.
The key to successfully clearing ground fault currents is _____. - CORRECT
ANSWERS electrical continuity
The bonding jumper for multiple disconnecting means is located _____. - CORRECT
ANSWERS on the supply side of the service disconnect
A transformer bonding jumper is routed with the feeder conductors from the transformer to the
equipment grounding bar in the panel and is known as a(n) _____. - CORRECT
ANSWERS supply-side bonding jumper
When a new grounding system has been installed, it is advisable to conduct baseline three-
point tests every _____. - CORRECT ANSWERS season for the first year
A transformer-supplied system operating at less than 50V must be grounded if the supply
voltage to the transformer exceeds _____. - CORRECT ANSWERS 150V to ground
A ground tester can be used to measure the value of a grounding electrode's _____. - CORRECT
ANSWERS resistance
