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DOE-HDBK-1092-2004
4.9
SYSTEM WITH GROUNDED CONDUCTOR
The main purpose of the grounded conductor is to carry unbalanced neutral current or fault
current in the event that one phase should go to ground.
Note: The grounded conductor does not always have to be a neutral conductor. It can be a
phase conductor, as when used in a corner grounded delta system.
In solidly grounded service-supplied systems, the equipment grounding conductors shall be
bonded to the system-grounded conductor and the grounding electrode conductor at the service
equipment. The grounded conductor may be used to ground the noncurrent-carrying metal parts
of equipment on the supply side of the service disconnecting means per NEC 250.142. The
grounded conductor can also serve as the ground-fault current return path from the service
equipment to the transformer that supplies the service.
The grounded conductor shall not be used to ground the metal parts of enclosures enclosing
conductors and components on the load side of the service per NEC 250.142. See NEC
250.182, 250.130 and 250.140 for exceptions to this basic rule. NEC 250.24 requires the
grounded conductor to be connected as follows:
1. The grounded conductor shall be connected to the grounded (neutral) service conductor.
2. The connection shall be at an accessible point.
3. That accessible point can be anywhere from the load end of the service drop or service
lateral to and including the neutral bar in the service disconnecting means or service
switchboard.
The NEC allows the grounded conductor to be terminated and connected to ground at a
multitude of locations on the supply side of the service equipment. These locations are as
follows:
1. Service equipment
2. Meter base
3. Current transformer (CT) can
4. Metal gutter or wire way containing service entrance conductors.
See Figure 4-6 for the rules concerning the use of the grounded conductor.
4-10


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