Lucent Technologies 1200A 24V ECS Battery Plant J85500E-2
3 - 20 Engineering, Planning, and Ordering
Issue 7 October 1998
The lengths of all load and battery conductors must be known
before proceeding with this section. Use the following steps to
record the wire and breaker sizes for each load feeder in Table
3-F. Use additional sheets as needed.
1. Copy List 2 drains for each load feeder from Table 3-B to
Table 3-F.
2. Calculate the minimum wire size that meets the ampacity
requirement based on the List 2 drain for each load feeder.
3. List the wire sizes based on ampacity in Table 3-F.
4. Calculate the minimum wire size for each load feeder in
Table 3-B to meet the voltage drop requirements outlined
in paragraph “Calculating Voltage Drop.”
5. List the sizes based on voltage drop in Table 3-F.
6. Indicate the larger size for each load feeder in the column
marked “Selected Wire Gauge.”
7. Fill in the circuit breaker rating (10, 20, 30, 45 or 60
amperes) in Table 3-F for each feeder.
8. Record in Table 3-G the wire sizes for each battery feeder.
9. Calculate the minimum wire size that meets the ampacity
requirement based on the total plant List 1 drain divided by
the number of parallel battery strings.
10. Enter that wire size on the first line in Table 3-G.
11. Calculate the minimum wire size for each battery feeder in
Table 3-B to meet the voltage drop requirements outlined
in paragraphs “Battery Size versus Voltage Drop” and
“Calculating Voltage Drop.”
12. List the sizes based on voltage drop in Table 3-G.
