Square QED-2 - Grounding and Bonding

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Power-Style™ QED-2 Switchboards Section 4—Installation

ENGLISH

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