Lucent Technologies Lineage
®
2000 ECS/GPS Battery Plant J85500G-2
3 - 20 Engineering, Planning and Ordering
Issue 6 May 1999
Record Wire And
Breaker/Fuse
Sizes
Determine the lengths of all load and battery conductors before
proceeding with this section. Use the following steps to record
the wire and breaker/fuse 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 theList 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
above under 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 or fuse rating (e.g., 10, 20 or 30
Amps) 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
above under Battery Size Versus Voltage Drop and
Calculating Voltage Drop.
12. List the sizes based on voltage drop in Table 3-G.
13. Indicate the larger size for each load feeder in the final
column, “Selected Wire Gauge.”
