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4400 Series Installation and Operation Manual – 64527-008
Appendix D – Internal XFMR Unit Input/Output Cabling Guide
The 4400 Series UPS can be congured with a variety of Input and Output voltage transformers to accommodate dierent Input/Output voltage combinations.
The following tables and text assist with sizing cable for units with non-native input and output voltages.
Table D.2 – Recommended Minimum Input Cable Size for 3-Phase/4-Wire + G
Table D.3 – Recommended Minimum Output/Bypass Cable Size for 3-Phase/4-Wire + G
Table D.4 – Recommended Minimum Cable Size for 3-Phase/3-Wire + G
Table D.5 – Recommended Minimum Cable Size for 3-Phase/3-Wire + G
Table D.6 – Recommended Battery Cabling
Table D.7 – Input Transformer Current for Given Input Voltage
Table D.8 – Output Transformer Current for Given Output Voltage
Tables D.2 and D.3 list the recommended Power Cable sizing for each of the UPS – Vin/Vout transformers. Ampacity should be determined using Table
310.15(B)(16) of the NEC (National Electrical Code) for 75° copper conductors.
NOTES:
• 3-Phase/4-Wire cable sizing calculations based on 4-6 current carrying conductors per conduit. (NEC Table
310.15(B)(2)(a))
• Neutral cable sizing in Table D.2 and D.3 is based on allowing, when possible, 1.7 x I(line) for current carrying Neutral.
Otherwise, the maximum cable size allowed by the UPS power lug is specied.
80 kVA – For ease of installation, consider the alternative of substituting two (2) line-sized neutral cables in place of a
single larger neutral cable in 3-Phase, 4-Wire 80kVA installations
TABLE D.1 – UPS POWER LUG CABLE CAPACITY AND TORQUE SPECIFICATIONS
UPS POWER LUG CABLE CAPACITY TORQUE
15-30kVA (1) x #12 to #2 87 in-lb (9.8 N∙m)
50kVA (1) x #6 to 250 kcmil 275 in-lb (31 N∙m)
80kVA (2) x 1/0 to 600 kcmil 375 in-lb (42 N∙m)
D.2 – Input Cable Size for 3-Phase/4-Wire + G
TABLE D.2 – RECOMMENDED INPUT CABLE SIZE FOR 3-PHASE/4-WIRE + G
1
Vin, Vout, Vbyp
3P/4W+G
15kVA
(AWG)
20kVA
(AWG)
25kVA
(AWG)
30kVA
(AWG)
50kVA
(AWG)
80kVA
(AWG)
208/120V (no
Xfmr)
Phase #4 #3 #2 #2 4/0 500 kcmil
Neutral #2 #2 #2 #2 250 kcmil 2 x 500 kcmil
220/127V Phase #4 #3 #2 #2 4/0 500 kcmil
Neutral #2 #2 #2 #2 250 kcmil 2 x 350 kcmil
230/133V Phase #6 #4 #3 #2 3/0 500 kcmil
Neutral #3 #2 #2 #2 250 kcmil 2 x 300 kcmil
240/139V Phase #6 #4 #3 #2 4/0 400 kcmil
Neutral #2 #2 #2 #2 250 kcmil 2 x 300 kcmil
380/220V Phase #8 #6 #6 #4 #1 3/0
Neutral #4 #3 #2 1/0 4/0 500 kcmil
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