enphase IQ System Controller 3M - Addendum A: Wire Sizes and Tightening Torque

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IQ System Controller 3M quick install guide
Addendum A: Wire sizes and tightening torque
CIRCUIT
TIGHTENING TORQUE
N*MIN*LB
WIRE SIZE
AWGKCMILMCM
WIRE TYPE
WIRE MINIMUM
TEMP RATING
Main lugs 31.1/275 300 kcmil-6 Cu/Al 75°C
Main/backup lugs hex nut 5.4/48 — — 75°C
CSR breakers’ bottom wiring lugs 28.2/250 300 kcmil-2 Cu/Al 75°C
BR breakers (pre-installed wires) 3.1/27 6 AWG Cu 75°C
IQ Combiner lugs
2.8/25
3.4/30
3.9/35
4.5/40
10–14 AWG
8 AWG
4–6 AWG
2–3 AWG
— 75°C
IQ Battery lugs
2.8/25
3.4/30
3.9/35
4.5/40
10–14 AWG
8 AWG
4–6 AWG
2–3 AWG
— 75°C
DER lugs
2.8/25
3.4/30
3.9/35
4.5/40
10–14 AWG
8 AWG
4–6 AWG
2–3 AWG
— 75°C
Neutral (large lugs) 31.1/275 300 kcmil-6 AWG Cu/Al 75°C
Neutral and ground bars/
large holes (5/16–24 UNF)
5.6/50
5.1/45
4.5/40
4.0/35
1/0–3 AWG
4–6 AWG
8 AWG
10–14 AWG
Cu 75°C
Neutral and ground bars
small holes (10–32 UNF)
2.8/25
1.7/15
6–8 AWG
10–14 AWG
Cu 75°C
CTRL cable 0.2/1.77 18 AWG — 75°C
NOTE: Use copper wire only except where indicated.