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9400016-J0 Rev E
CXPS-E3
User Guide
7.5 Distribution cabling
7.5.1 Load planning and breaker (fuse) spacing
Because breakers and fuses generate most of the heat in a system, care must be taken in the layout of high
current breakers and fuses. Specific guidelines are as follows:
For 400A systems
1. Any single pole Over Current Protection Device (OCPD) rated at 125A can be mounted in pairs, but cannot
have an OCPD installed on either side of the pair.
2. Any single pole OCPD rated at 100A and below can be mounted in any position without spacing.
3. The highest rated bullet fuse that can be used is 125A. The highest rated single pole breakers that can
be used for a load is 100A. The highest rated single pole breaker that can be used for batteries is 125A at
temperatures below 55°C and 100A for temperatures above 55°C.
While these guidelines require some planning, they do not limit achieving the maximum 400A capacity for any
breaker size combination (except if many small breakers are used).
For 600A systems
1. The highest rated single position fuse holder is 125A.
2. The highest rated single pole breaker for a load is 100A.
3. Any single pole breaker rated above 90A must not have any over current protection device (OCPD) installed
in the positions on either side of it.
4. Any single pole breaker rated 90A and below can be mounted in any position without spacing.
5. The single position fuse holder can be mounted without spacing (except in reference to item 2).
7.5.2 Load connections
For wire sizing refer to guidelines supplied with the load equipment.
Terminate distribution cabling with 1/4"–5/8" center lugs for connecting to the CXPS-E3 distribution. Always
make the return connection to the CXPS-E3, and then verify the nut tightening torque before installing the hot
connection as once the hot connection is in place it is difficult to access the return connection.
Always use the supplied hardware (nuts) for attaching the lugs. The supplied nuts have a serrated flange which
eliminates the need for a second lock washer both allowing more threads to show after a completed connection
and avoiding thin hardware which can fall through small gaps in the equipment covers.
Load and battery breaker return connections
1. Secure cables with two hole lugs to the 1/4" studs on 5/8" centers using the supplied hardware.
2. Run cables directly out the back of the distribution center.
Load and battery breaker hot connections
1. Secure cables with two hole lugs to the 1/4" studs on 5/8" centers using the supplied hardware.
2. Run cables directly out the back of the distribution center above the breaker return cables.
CAUTION! and HOT!
For applications when the CXPS-E3 is subjected to ambient temperatures above 55°C it must
be installed inside equipment such that unintentional contact with the area of the side panels
between the mid-mount bracket and the back of the unit is unlikely. For clarity this is the area
marked with a "Caution - Hot" label.
Connect breaker returns before hot connections.
NOTE
