Please read the following instructions for DC wiring (M80/60U_121) :
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.
•
Ensure the correct conductor is connected to its associated terminal with ring lug
(max width ≤ 25mm).
•
The range of conductor sizes accommodated by each DC terminal is 1~3/0AWG.
Tighten each terminal with screw (M6) with a torque value of 52 lbf-in (5.9 N•m).
• For aluminum cable :
Min./max. Conductor cross-section 35 / 70 mm
2
Tightening torque 52 lbf-in (5.9 N•m)
• For the 121 model, two mounting options for installing the DC connection are
available, bottom (2" chassis access hole (KO)) or side entry (2½" chassis access
hole (KO)). If side entry is required, remove the bus bar with torque value 159.3
lbf-in (18 N•m) as shown in Figure 3-30. After removing the bus bar, if the bottom
entry is again required, install the bus bar back with torque value 159.3 lbf-in (18 N•m).
3.4.2 DC Wiring Installation for M80/60U_121 models
- Please follow the following guideline for cabling if you use aluminum cables.
Guideline for aluminum conductor :
- The oxide layer must be removed from the surface of the stripped aluminum
conductor.
- The stripped aluminum conductor is greased with Vaseline or contact grease
with comparable properties after oxide layer removed.
- Tightened with the maximum tightening torque for the modular terminal block.
- The installation location must be kept free from humidity or aggressive
atmospheres.
ATTENTION
IN1 +
IN2 +
IN1
-
IN2
-
PE
Conductor cross-section: 1 ~ 3/0 AWG (35 ~ 70mm²)
Allowable PE conductor size 6 ~ 4 AWG (14 ~ 22mm²)
Torque terminal screw to 26 lbf-in (3 N•m)
EMT
Figure 3-27: Size for DC conductors for M80/60U_121
50
Installation
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