Alpha Technologies AMPS80 HP - Manual (Page 21)

19 Doc. #: 026-069-B0 Rev F
3.2 3-Phase Systems – Recommended AC and DC Breakers
The recommendations in Table A are for reference only. A registered professional engineer
must review and approve or modify these recommendations in compliance with applicable
national and local electrical and building codes.
NOTE:
Table A — 75 kVA, 3-phase systems (AMPS80-3-75 series), single AC feed
Model
AMPS80-3-75
W
ithout rectifiers W
ithout MBS
AMPS80-3-75-H2
W
ith rectifiers
W
ithout MBS
AMPS80-3-75,
MBS
W
ithout rectifiers
W
ith MBS
AMPS80-3-75-H2,
MBS
W
ith rectifiers
W
ith MBS
AC
input
AC input voltage 120/208 V 120/208 V 120/208 V 120/208 V
Full load AC input current per phase 177 A 227 A 223 A 273 A
AC input poles & wiring 4 w + G 4 w + G 4 w + G 4 w + G
Wiring 3Ф Wye 3Ф Wye 3Ф Wye 3Ф Wye
Recommended
AC input breaker/fuse2
225 A 300 A 300 A 350 A
Recommended
AC input wire size
90ºC copper1
NEC 30ºC #3/0 250 kcmil 250 kcmil 350 kcmil
CEC 30ºC #4/0 300 kcmil 300 kcmil See dual feed
NEC 40ºC #4/0 300 kcmil 300 kcmil See dual feed
CEC 40ºC 250 kcmil 350 kcmil 350 kcmil See dual feed
AC
output
Total maximum AC output 75 kVA, 60 kW 75 kVA, 60 kW 75 kVA, 60 kW 75 kVA, 60 kW
AC output voltage 120/208 V 120/208 V 120/208 V 120/208 V
AC output poles & wiring 4 w + G 4 w + G 4 w + G 4 w + G
Wiring 3Ф Wye 3Ф Wye 3Ф Wye 3Ф Wye
AC output current per phase 208 A 208 A 208 A 208 A
Installed inverter input
& output circuit breaker
250 A 250 A 250 A 250 A
Recommended
AC output wire size
90ºC copper1
NEC 30ºC #4/0 #4/0 #4/0 #4/0
CEC 30ºC 250 kcmil 250 kcmil 250 kcmil 250 kcmil
NEC 40ºC 250 kcmil 250 kcmil 250 kcmil 250 kcmil
CEC 40ºC 300 kcmil 300 kcmil 300 kcmil 300 kcmil
AC input & output
connection terminals
Box lugs are rated for either Aluminum or Copper wire, 350 kcmil to #6 AWG. Fasten clamping screw to
42 N-m (375 in-lbs) for #1 AWG to 350 kcmil wire or 23 N-m (200 in-lbs) for #6 to #2 AWG wire.
Note 1
Inverter AC Input & AC Output connections: Calculations based on full load and charging current, 0.8 derating with 5
current carrying conductors, (L1,L2,L3,2XN) due to possible high harmonic content load. Temperature correction factor
applied when needed.
Note 2
Maximum AC utility service protection feeding the AMPS80 HP is 400 A. The actual supply circuit breaker must be sized
appropriately for the supply wire used. Consult your local and national electrical codes. The AC source must be limited to
18 kA short circuit current. Double neutral is strongly recommended for AC output wiring (and AC input wiring to the MBS)
for 3Ф systems with significant non-linear (ie rectified capacitive) loads. Because the AC input to the inverters is power
factor corrected, AC wiring solely to the inverters does not require double neutral wiring.