Emerson FPC user manual Main input circuit breaker interrupting rating

								Installation Instructions
Table 4	Suggested minimum input wire size data (continued)
			Units with Transformers				Transformerless Units
kVA	Input	Input		Input	Suggested Feeder	Full Load	MIB Trip	Suggested Feeder
	Voltage	FLA		OPD	Wire Size (AWG)	Amps	Amps	Wire Size (AWG)
	208	427		600	(2) 350 kcmil *	416	600	(2) 350 kcmil *
	240	370		500	(2) 250 kcmil *	-	-	-
	380	234		300	350 kcmil	228	300	350 kcmil
150
	400	223		300	350 kcmil	217	300	350 kcmil
	415	215		300	350 kcmil	209	300	350 kcmil
	480	185		250	250 kcmil	-	-	-
	600	148		200	#3/0 AWG	-	-	-
	380	312		400	(2) #3/0 AWG *	304	400	(2) #3/0 AWG *
	400	297		400	(2) #3/0 AWG *	289	400	(2) #3/0 AWG *
200
	415	286		400	(2) #3/0 AWG *	278	350	(2) #2/0 AWG *
	480	247		350	(2) #2/0 AWG *	-	-	-
	600	197		250	250 kcmil	-	-	-
	380	352		450	(2) #4/0 AWG *	342	450	(2) #4/0 AWG *
	400	334		450	(2) #4/0 AWG *	325	450	(2) #4/0 AWG *
225
	415	322		450	(2) #4/0 AWG *	313	400	(2) #3/0 AWG *
	480	278		350	(2) #2/0 AWG *	-	-	-
	600	222		300	350 kcmil	-	-	-
	380	469		600	(2) 350 kcmil *	456	600	(2) 350 kcmil *
	400	446		600	(2) 350 kcmil *	433	600	(2) 350 kcmil *
300
	415	430		600	(2) 350 kcmil *	417	600	(2) 350 kcmil *
	480	372		500	(2) 250 kcmil *	-	-	-
	600	297		400	(2) #3/0 AWG *	-	-	-

*Parallel feeders per NEC 300-20 and 310-4 FLA = Full Load Amps of Power Center

OPD = Overcurrent Protection Device inside FPC

Wire sizes based on NEC 2005, Table 310-16, using 75°C copper conductor

1.Main input power feeder should be a dedicated feeder direct from service entrance or other power source possible

2.Ground conductors recommended to be insulated conductors run with power conductors for increased system performance. Ground conductor minimum size per NEC Table 250-66. Input power feeder conduit may be used as the safety ground conductor. When conduit is used, adequate electrical continuity must be maintained at conduit connections to enclosures and throughout conduit run.

3.Input feeder wire size listed in this table is the minimum feeder size recommended. Larger wire size may be required because of voltage drop or supply overcurrent protection device.

4.For transformerless units with 3-phase 4W + G input feeder larger wire size may be required because of excessive neutral current (see NEC Table 310-15 note 4: For best performance, the unit should be located as close to load as practical.

Table 5 Main input circuit breaker interrupting rating

Standard interrupting rating*

208V	480V	380-415V	600V
65 kA	35 kA	35 kA	18 kA

*Refer to unit specification sheet for units equipped with non-standard main input breakers.

13