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3.4.2 DC Wiring Installation for 121 models
Please read the following instructions for attaching DC terminals (121 models):
• These models are designed to be utilized with external combiner boxes and
are not provisioned with internal DC combining capability.
• Specific size of DC conductors must be determined from NEC or other local
codes.
• The range of conductor sizes accommodated by each DC terminal is 8~2 AWG.
• Ensure the correct conductor is connected to its associated terminal.
• Tighten each terminal block screw to a torque value of 8AWG - 40lbf-in (4.5N.m)
; 6~2 AWG - 110 lbf-in (12.4 N.m).
• The bending space is 160 mm [6.3in] which meets the safety standard.
• For the 121 model, two mounting options for installing the DC connection are
available, bottom or side entry; both options have a 2" chassis access hole
(KO). Side entry is shown in Figure 3-14.
Ensure the DC terminal block screws are tightened to a torque value of
8AWG - 40 lbf-in (4.5 N.m)
6~2AWG - 110 lbf-in (12.4 N.m)
- For aluminum cable :
Min./max. Conductor cross-section 10 / 33.6 mm
Tightening torque 110 lbf-in (12.4 N.m)
AC Switch
DC Terminals
Stripping length: 17mm [0.67in]
Conductor cross-section: 8~2AWG (8~33.6mm²)
Torque: 8AWG - 40 lbf-in (4.5 N.m)
Figure 3-14: Location for DC terminals for 121 models
ATTENTION
6~2AWG - 110 lbf-in (12.4 N.m)
2
IN 1
IN 1
39
Installation
IN 2
IN 2
2" cable gland for
DC with EMT
EMT
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