Liebert NXL installation manual Current ratings-battery, Recommended conduit and cable sizes

Electrical Installation

Table 4	Current ratings—battery
UPS Rating				Maximum Battery	External Breaker
kVA		kW	Nominal VDC	Current at EOD	Trip, Amps
250		225	480	615	700
300		270	480	737	800
400		360	480	981	1000

Notes on Tables

1.Nominal input current (considered continuous) is based on full-rated output load. Maximum current includes nominal input current and maximum battery recharge current (considered noncontinuous). Continuous and noncontinuous current are defined in NEC 100. Maximum input current is controlled by the current limit setting which is adjustable. Values shown are for maximum setting of 125%. Standard factory setting is 125%.

2.Recommended bypass external overcurrent protection is based on 125% overload capacity for 10 minutes.

3.All recommended external overcurrent protections are based on 80% rated breakers.

4.Nominal battery voltage is shown at 2.0 volts / cell.

Table 5 Recommended conduit and cable sizes

Rectifier Input

				Voltage		Nominal Selection		Alternate Selection
UPS Rating
				(VAC)		Top Cable Entry Input	Bottom Cable Entry	Top Cable Entry Input	Bottom Cable Entry
						Wire & Conduit	Input Wire & Conduit	Wire & Conduit	Input Wire & Conduit
kVA	kW	Input		Bypass	Output	Ph, G THW / FMC	Ph, G THW / RNC	Ph, G THW / FMC	Ph, G THW / RNC
250	225	480		480	480	(2) 2.5C 3-250kcmil,	(2) 2.5C 3-250kcmil,	(3) 2C 3-#2/0AWG,	(3) 2C 3-#2/0AWG,
						#1/0AWG	#1/0AWG	#1/0AWG	#1/0AWG
300	270	480		480	480	(2) 3C 3-350kcmil,	(2) 3C 3-350kcmil,	(3) 2.5C 3-#4/0AWG,	(3) 2.5C 3-#4/0AWG,
						#1/0AWG	#1/0AWG	#1/0AWG	#1/0AWG
400	360	480		480	480	(2) 3C 3-500kcmil,	(2) 3.5C 3-500kcmil,	(3) 2.5C 3-250kcmil,	(3) 2.5C 3-250kcmil,
						#1/0AWG	#1/0AWG	#1/0AWG	#1/0AWG
Bypass Input
						Nominal Selection		Alternate Selection
UPS Rating			Voltage (VAC)
						Top Cable Entry Input	Bottom Cable Entry	Top Cable Entry Input	Bottom Cable Entry
						Wire & Conduit	Input Wire & Conduit	Wire & Conduit	Input Wire & Conduit
kVA	kW	Input		Bypass	Output	Ph, N, G THW / FMC	Ph, N, G THW / RNC	Ph, N, G THW / FMC	Ph, N, G THW / RNC
250	225	480		480	480	(3) 2.5C 3-#2/0AWG,	(3) 3C 3-#2/0AWG,	(2) 3C 3-250kcmil,	(2) 3C 3-250kcmil,
						2-#1/0AWG, #1/0AWG	2-#1/0AWG, #1/0AWG	2-#4/0AWG, #1/0AWG	2-#4/0AWG, #1/0AWG
300	270	480		480	480	(3) 2.5C 3-#4/0AWG,	(3) 3C 3-#4/0AWG,	(2) 3C 3-350kcmil,	(2) 3.5C 3-350kcmil,
						2-#1/0AWG, #1/0AWG	2-#1/0AWG, #1/0AWG	2-#4/0AWG, #1/0AWG	2-#4/0AWG, #1/0AWG
400	360	480		480	480	(3) 3C 3-250kcmil,	(3) 3C 3-250kcmil,	(2) 3.5C 3-500kcmil,	(2) 4C 3-500kcmil,
						2-#4/0AWG, #1/0AWG	2-#4/0AWG, #1/0AWG	2-350kcmil, #1/0AWG	2-350kcmil, #1/0AWG
Output
						Nominal Selection		Alternate Selection
UPS Rating			Voltage (VAC)
						Top Cable Entry Input	Bottom Cable Entry Input	Top Cable Entry Input	Bottom Cable Entry
						Wire & Conduit	Wire & Conduit	Wire & Conduit	Input Wire & Conduit
kVA	kW	Input		Bypass	Output	Ph, N, G THW / FMC	Ph, N, G THW / RNC	Ph, N, G THW / FMC	Ph, N, G THW / RNC
250	225	480		480	480	(3) 2.5C 3-#2/0AWG,	(3) 3C 3-#2/0AWG,	(3) 2.5C 3-#2/0AWG,	(3) 3C 3-#2/0AWG,
						2-#1/0AWG, #1/0AWG	2-#1/0AWG, #1/0AWG	2-#1/0AWG, #1/0AWG	2-#1/0AWG, #1/0AWG
300	270	480		480	480	(3) 2.5C 3-#4/0AWG,	(3) 3C 3-#4/0AWG,	(3) 2.5C 3-#4/0AWG,	(3) 3C 3-#4/0AWG,
						2-#1/0AWG, #1/0AWG	2-#1/0AWG, #1/0AWG	2-#1/0AWG, #1/0AWG	2-#1/0AWG, #1/0AWG
400	360	480		480	480	(3) 3C 3-250kcmil,	(3) 3C 3-250kcmil,	(3) 3C 3-250kcmil,	(3) 3C 3-250kcmil,
						2-#4/0AWG, #1/0AWG	2-#4/0AWG, #1/0AWG	2-#4/0AWG, #1/0AWG	2-#4/0AWG, #1/0AWG
Battery
						Nominal Selection		Alternate Selection
UPS Rating			Voltage (VAC)
						Top Cable Entry Input	Bottom Cable Entry Input	Top Cable Entry Input	Bottom Cable Entry Input
						Wire & Conduit	Wire & Conduit	Wire & Conduit	Wire & Conduit
kVA	kW	Input		Bypass	Output	Wires, G THW / FMC	Wires, G THW / RNC	Wires, G THW / FMC	Wires, G THW / RNC
250	225	480		480	480	(2) 2.5C 2-350kcmil,	(2) 2.5C 2-350kcmil,	(3) 2C 2-#4/0AWG,	(3) 2C 2-#4/0AWG,
						#1/0AWG	#1/0AWG	#1/0AWG	#1/0AWG
300	270	480		480	480	(2) 2.5C 2-500kcmil,	(2) 3C 2-500kcmil,	(3) 2C 2-250kcmil,	(3) 2C 2-250kcmil,
						#1/0AWG	#1/0AWG	#1/0AWG	#1/0AWG
400	360	480		480	480	(3) 2.5C 2-500kcmil,	(3) 3C 2-500kcmil,	(4) 2C 2-250kcmil,	(4) 2.5C 2-250kcmil,
						#4/0AWG	#4/0AWG	#4/0AWG	#4/0AWG

If the UPS is used in a four-wire system, the neutral ground jumper must be removed.

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