System Application Guide
SAG582120600
Spec. No. 582120600 (Model 801DB
NVGB
)
Revision BK, September 27, 2017
Page 47 of 75
DC Input Cable Sizes and Lugs Selection
Features
♦
DC input (-48V) leads terminated in the appropriate lug are connected to the
Bay Input Feed and Shunt
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
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
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.
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. Lugs should be crimped per lug manufacturer’s
specifications.
Table 10
Recommended DC Input
Wire Size and Lug Selection
