System Application Guide
SAG582127000
Spec. No. 582127000 (Model 721
NPBB
)
Issue AF, February 26, 2014
Page 81 of 125
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AC Input Branch Circuit Protection and Wire Size Selection
for AC Input Termination Assembly List 40, 41, 42
when used with 588705300 Module Mounting Shelves with Rectifiers
(Nominal 208/240 Volts AC)
Refer to the following tables for recommended wire sizes and branch circuit protection.
AC INPUT TO LIST 40 AC INPUT TERMINATION ASSEMBLY
(Nominal 208/240 Volts AC, Single Phase, 50/60 Hz)
Provides “1 AC Feed per 1 Rectifier” Single Phase Input Terminations
(System with Spec. No. 588705300 Rectifier Shelves)
Input
Voltage
Input
Current
(7)
Overcurrent
Protection
(1)
40°C Ambient
Temperature
Wire
(2) (3) (4)
Conduit
Size
(5) (6)
208 VAC
10A
15A
14 AWG
3/4”
240 VAC
8.8A
15A
14 AWG
3/4”
1
The AC input branch circuit protective device should be of the time-delay or high inrush type.
2
Wire sizes based on recommendations of the American National Standards Institute (ANSI) approved National
Fire Protection Association's (NFPA) National Electrical Code (NEC). Table 310.15 (B) (16) for copper wire at
90°C conductor temperature. For operation in countries where the NEC is not recognized, follow applicable
codes.
3
Equipment grounding conductors must be provided with the AC input conductors supplied to the shelf. Frame
ground terminals must be connected to earth ground, not power system neutral. Equipment grounding
conductor size based on recommendations of the NEC Table 250-122 for copper wire. If aluminum or copper
clad aluminum grounding conductor is used, refer to Table 250-122 for increased conductor size. For operation
in countries where the NEC is not recognized, follow applicable codes.
4
THHN 90
°
C Wire.
5
System with Four (4) Spec. No. 588705300 Rectifier Shelves: Conduit sized for twelve (12) current carrying
conductors and one (1) ground conductor per conduit (based on NEC recommendations), for six (6) PCUs. For
operation in countries where the NEC is not recognized, follow applicable codes.
6
System with Five (5) Spec. No. 588705300 Rectifier Shelves / Shelf #6 is Expansion Shelf: Conduit sized for six
(6) current carrying conductors and one (1) ground conductor per conduit (based on NEC recommendations), for
six (6) PCUs. For operation in countries where the NEC is not recognized, follow applicable codes.
7
Input current based on R48-2000e3 rectifier module.
Table 21
Recommended AC Input Branch Circuit Protection and Wire Size when Using
List 40 “1 AC Feed per 1 Rectifier – Single Phase” AC Input Termination Assembly,
System with Spec. No. 588705300 Rectifier Shelves
