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Power Supply Load Calculations
Battery Power
Siemens Industry, Inc.
Building Technologies Division
Wire in accordance with local codes and Article 760 of the NEC, NFPA latest edition.
In compliance with NEC, all power limited fire protective signaling conductors must
be separated a minimum of a 1/4" from all of the following wiring located within a
control panel:
•
Electric light
•
Power
•
Class 1 or non-power limited fire protective signaling conductor
Refer to the CAB2-BB Installation Instructions, P/N 315-033009 for wiring require-
ments to comply with NEC codes and Figure 6 for battery and AC power connections.
To ensure that the PSX-12 power supply is not overloaded, use the form and follow
the procedure listed below.
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1.
Enter the quantity of each card/module in the enclosure.
2.
Calculate both the 24VDC and 6.2VDC loads for each row.
3.
Total the Active 24VDC and Active 6.2VDC columns.
4.
Ensure that both totals are within the power supply output ratings.
Make sure that the battery circuit breaker is in the OFF position.
Use either 14 or 12 AWG for battery connection.
Battery backup is required for compliance to UL864. (15 amp hours is the minimum
size and 100 amp hours is the maximum size of the battery for the PSX-12).
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P/N 315-048553-5
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