GE Industrial Solutions Micro-BDCBB - Manual (Page 33)

J85568E-1 Secondary DC Mini-Distribution Bay
Issue 6 January 2008 Installation 5 - 5
Connecting
Load and
Distribution
Cabling
List 2 is configured with two load buses. A 300-ampere shunt
and bus bar assembly connects Load Bus A to the top two fuse
or circuit breaker panels and Load Bus B to the bottom two fuse
panels. Panel positions 1 and 3 must be equipped with List C
fuse panels or List D circuit breaker panels. Panel positions 2
and 4 may be equipped with either a List B blank panel, a List C
fuse panel, or a List D circuit breaker panel.
Figure 5-3 shows a rear view of the Mini-Distribution Bay and
the A/B load connections.
Cabling from the battery plant is terminated to each load on a
single set of 3/8-inch studs on 1.00-inch centers that are located
on the top right of the unit. If more than one cable is required due
to voltage drop considerations, terminal lugs may be mounted
back-to-back.
(A minimum of two 350 MCM battery input/return cables is
recommended per 300 ampere load.)
The Mini-Distribution Bay is equipped with a distribution return
bus located along the left and bottom sides of the unit. The bus
bar has a 600-ampere current carrying capacity and is equipped
with 1/4-inch studs on 0.625-inch centers for terminating the
(48) distribution return leads. There is also a set of 3/8-inch studs
on 1.00-inch centers located at the top of this bus bar for
terminating load return cabling from the battery plant and the
central office ground connection (if required). If more than two
cables are required, terminal lugs may be mounted back-to-back.
Hardware for connecting the terminal lugs is furnished with the
Mini-Distribution Bay. Refer to Table 3-B for the list of terminal
lug options for load return cabling. Table 3-C lists the terminal
lug options available for the distribution return cabling. If
voltage drop considerations require distribution cable sizes
larger than 2 gauge, the installer must gutter tap down to 2 gauge
before connection in the unit. Recommended torque values for
terminating distribution cabling is 75 inch/lbs.
Note
All bus bars used in this product are copper with a solder plate
finish. Bus bars do not require buffing or the application of
no-ox before connection of terminal lugs or other bus bars.