XP-6341 6/1010 Section 1 General
1.7.4 Ground and Neutral Connections
Ground the generator set. The grounding method must
comply with NEC and local codes. Connect the
grounding strap to the generator set ground lug. See
Figure 1-2 for the ground lug location inside the junction
box.
1. Ground (GRD) connection
1
GM69195
Figure 1-2 Generator Set Equipment Ground
Connection
Various regulations and site configurations including the
National Electrical Code (NEC), local codes, and the
type of transfer switch used in the application determine
the grounding of the neutral at the generator. NEC 2002
Section 250.20 is one example that has a very good
explanation of the neutral grounding requirements for
generators.
Generator sets are shipped with the generator neutral
attached to the generator in the junction box. At
installation, the neutral can be grounded at the
generator set or lifted from the ground stud and isolated
if the installation requires an ungrounded neutral
connection at the generator. The generator set will
operate properly with the neutral either bonded to
ground or isolated from ground at the generator.
1.7.5 Terminal Connector Torque
Use the torque values shown in Figure 1-3 or Figure 1-4
for terminal connectors. Refer to UL-486A, UL-486B,
and UL-486E for information on terminal connectors for
aluminum and/or copper conductors. Comply with
applicable national and local codes when installing a
wiring system.
Note: If a connector has a c lamp screw such as a
slotted, hexagonal head screw with more than
one means of tightening, test the connector using
both applicable torque values provided in
Figure 1-4.
Socket Size Across
Flats, mm (in.)
Tightening Torque,
Nm (in. lb.)
3.2 (1/8) 5.1 (45)
4.0 (5/32) 11.4 (100)
4.8 (3/16) 13.8 (120)
5.6 (7/32) 17.0 (150)
6.4 (1/4) 22.6 (200)
7.9 (5/16) 31.1 (275)
9.5 (3/8) 42.4 (375)
12.7 (1/2) 56.5 (500)
14.3 (9/16) 67.8 (600)
Note: For values of slot width or length not corresponding to
those specified, select the largest torque value
associated with the conductor size. Slot width is the
nominal design value. Slot length is to be measured at
the bottom of the slot.
Figure 1-3 Tightening Torque for Pressure Wire
Connectors with Internal-Drive
Socket-Head Screws
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