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Power-Style™ QED-2 Switchboards
Section 4—Installation
26
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Grounding and Bonding
NOTE:
A system is “grounded” if it is grounded at any point ahead of the switchboard,
whether the grounded conductor (neutral) is carried through to the loads, or not.
Service Equipment—
Grounded System
For solidly
grounded
systems used as either service equipment or as a main
switchboard on a separately derived system:
1. Run a grounding electrode conductor from the grounding electrode at the
installation site to the grounding electrode conductor connector (ground lug)
located on the switchboard ground bus (or on the neutral bus, if so indicated on
the equipment drawing) (Figure 17). Select the material and size of this
grounding electrode conductor to comply with Sections 250-62 and 250-66 of
the NEC or Sections 10-204 and 10-206 of the 1998 CEC, and install it as
specified in Section 250-64 of the NEC or Section 10-908 of the 1998 CEC.
2. Install the main bonding jumper between the neutral bus and the
ground bus (Figure 18 or 19 on 27). For torque values, refer to
“Section 9—Torque Values for Electrical Connections” on page 51.
NOTE:
If the switchboard is fed from multiple sources (for example,
double-ended systems), there may be two or more main bonding jumpers to
install.
Figure 17 – Grounding Electrode Connector
Grounding electrode
conductor connector
Ground bus