Quiz 303

I, II, and III

Shown in figure 303.02 is a 120/208 volt, 3ph, 4 wire transformer supplying a panel. if a ground fault occurs when the ungrounded conductor touches EMT #2, the fault current will travel through the __ to get back through the transformer winding and finally to the OCPD to cause it to open.

bonded together

All equipment bonding conductors and grounding buses in service panels must be__.

NO

An air conditioner condenser unit was supplied with a 240 volt circuit that was run in PVC. The circuit originates in a 120/240volt 1ph, 3 w service panel. Only two hot conductors were installed in the pvc. the AC unit is contained in a metal enclosure. You found that the grounding lug on the unit was tied to a ground rod driven next to the unit. Is the NEC satisfied with this grounding arrangment?

False

ALL NEC grounding requirements are covered in Article 250. True/False

II only

During ground faults, electrons seekto return to ___. I. ground (earth) II. The source of the power

IV

In figure 303.05, the grounded conductor is shown at point __.

II

In figure 303.05, the grounding electrode conductor is shown at point __.

intended to interupt a fault current be so rated

NEC section 110.9 requires that electrical equipment__.

II only

Systems are grounded to provide a path for ___ I. Fault current II. Lightning. III. Short circuit current

False

The purpose of the grounding electrode conductor and the grounding electrode is to establish a ground-fault current path to open the circuit overcurrent protective device.

517

The requirements for grounding equipment in health care facilities are found in Article__.

I, II, and III

When a ground fault occurs in a 208-volt, 1ph brach circuit, the fault current must travel through the __ to get back through the OCPD to cause it to open. The 208 volt circuit originates in a 12-/208 volt, 3ph, 4wire service panelboard. I. equipment grounding conductor II. main bonding jumper III. Utility grounded conductor

operate as it should

You connected the GEC to the copper main service water pipe above ceiling. The plumber later disconnected it and has left it disconnected. Becuase ofthis, if a hot branch circuit conductor contacts the EGC installed with that circuit, the branch circuit breaker will __.

any of these

__ can be used to connect grounding conductors and bonding jumpers. a. Exothermic welding b. Listed pressure connectors. c. Listed clamps. d. Any of these.

Bonding

___ is where conductors and metal equipment are connected to establish electrical continuity and conductivity.