Application Guide

System Application Guide SAG582120600
Spec. No. 582120600 (Model 801DB
NVGB) Issue BF, February 21, 2014
Page 47 of 72
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DC Input Cable Sizes and Lugs Selection
Features
♦ DC input (-48V) leads terminated in the appropriate lug are connected to the List 145 Bay Input Feed and
Shunt Assembly. See DC Input Connections under Wiring Illustrations in ACCESSORY
DESCRIPTIONS.
♦ DC input return leads terminated in the appropriate lug are connected to the optional internal
ground/return bars or to external ground/return bars. See DC Input Connections under Wiring
Illustrations in ACCESSORY DESCRIPTIONS.
Restrictions
All lugs for customer connections must be ordered separately.
Customer needs to supply lug mounting bolts and hardware.
Maximum size of wire to be connected to a single lug position and maximum lug width are as shown in the
Wiring Illustrations.
Ordering Notes
1) DC input cable size varies depending on power requirements, therefore no specific information is
provided for cable size. Refer to Table 10 for recommended cable sizes and lugs at rated maximum bay
load (640A per Distribution Panel, 1800A per Side 6-Panel Bay, 2400A per Side 8-Panel Bay). Note that
loads typically should not exceed 80% of capacity; therefore, input cables have been sized for an
overcurrent protection device rated at 800A. When making connections, observe correct polarity.
2) For other available lugs, refer to drawings 031110100 through 031110300.
External
Overcurrent
Protection
Device Rating
Ambient
Operating
Temperature
(1)
Loop
Length (Ft)
1.0 Voltage
Drop
(2)
Loop
Length (Ft)
0.25 Voltage
Drop
(2)
Recm 90
°
C
Wire Size
(AWG)
(1)
Recommended
Crimp Lug
(3)
800A 40°C
84.5 21.1 750 kcmil
245348100
168.9
42.2
(2) 750 kcmil
1
Wire sizes are based on recommendations of the American National Standards Institute (ANSI)
approved National Fire Protection Association's (NFPA) National Electrical Code (NEC). Table
310-17 for copper wire rated at 90
°
C conductor temperature operating in ambient temperature of
40
°
C was used. For other operating ambient temperatures, refer to the NEC. For operation in
countries where the NEC is not recognized, follow applicable codes.
2
Recommended wire sizes are sufficient to restrict voltage drop to the voltage shown in the column
heading, or less, at rated full load output current of the system for the loop lengths shown in this
column. Loop length is the sum of the lengths of the positive and negative leads.
3
Two-hole lug, 3/8 bolt clearance hole, 1.00" centers. Refer to drawing 031110100 for lug crimping
information.
Table 10
Recommended DC Input
Wire Size and Lug Selection
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