System Application Guide
SAG582127000
Spec. No. 582127000 (Model 721
NPBB
)
Issue AF, February 26, 2014
Page 101 of 125
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Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
Load Distribution
Load Distribution Wire Sizes and Lugs Selection
The rating of the distribution device determines the load lead wire size requirement. The distribution panel
ordered determines the lug hole size and spacing requirements. For wire size and lug selection; refer to the
following.
•
When Distribution Panels using Bullet Nose Type Devices (TPS/TLS Fuses and/or Bullet Nose
Type Circuit Breakers) are Provided:
Lug-terminated load leads are connected to the individual load
busbars and load return busbar (if equipped) located on the distribution panel. If the distribution panel is
not equipped with a load return busbar, load return connections are made to a separate return busbar.
The distribution panel’s individual load busbars and load return busbar (if equipped) provide 1/4-20
studs for installation of customer-provided two-hole lugs that have 5/8 inch centers and 1/4 inch bolt
clearance holes. Customer must provide (or order) lug mounting hardware. The distribution panel’s
individual load busbars and return busbar (if equipped) are designed to accommodate the lugs listed
and
to select recommended load distribution wire sizes and lugs for
various loop lengths per fuse/circuit breaker ampere rating. Maximum size of wire to be connected to
a single fuseholder/circuit breaker position is 2 AWG. For wiring up to 350 kcmil, see
the following part numbers in ACCESSORY DESCRIPTIONS for available lug adapter busbars:
and
The separate return busbar (if furnished) provides 3/8-16 captive nuts for installation of customer-
provided two-hole lugs that have 1 inch centers and 3/8 inch bolt clearance holes. Customer must
provide (or order) lug mounting bolts and hardware. The separate return busbar (if furnished) are
designed to accommodate the lugs listed in
distribution wire sizes and lugs for various loop lengths per fuse/circuit breaker ampere rating.
•
When Distribution Panels using GJ/218 Circuit Breakers, TPH Fuses, or TPL-B Fuses are
Provided:
Lug-terminated load leads are connected to the individual load busbars and load return
busbar (if equipped) located on the distribution panel. If the distribution panel is not equipped with a load
return busbar, load return connections are made to a separate return busbar.
The distribution panel’s individual load busbars and load return busbar (if equipped) provide 3/8-16
captive nuts or studs for installation of customer-provided two-hole lugs that have 1 inch centers and
3/8 inch bolt clearance holes. Customer must provide (or order) lug mounting bolts (if required) and
hardware. The distribution panel’s individual load busbars and return busbar (if equipped) are
designed to accommodate the lugs listed in
distribution wire sizes and lugs for various loop lengths per fuse/circuit breaker ampere rating.
The separate return busbar (if furnished) provides 3/8-16 captive nuts for installation of customer-
provided two-hole lugs that have 1 inch centers and 3/8 inch bolt clearance holes. Customer must
provide (or order) lug mounting bolts and hardware. The separate return busbar (if furnished) are
designed to accommodate the lugs listed in
distribution wire sizes and lugs for various loop lengths per fuse/circuit breaker ampere rating.
•
For other available lugs and hardware, refer to drawings 031110100 through 031110300.
