ET Solar ET-P660250AC, Installation Manual

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power. Proper safety procedures must be followed when installing or accessing the dedicated 
branch circuit wiring, which includes unplugging the AC Modules from the dedicated branch 
circuit. 

•

The AC module interconnecting cable system includes an internal equipment grounding 
conductor (EGC) connected to each module through pluggable connectors with a longer 
ground pin. 

•

The AC module does NOT require a DC or AC grounding electrode conductor (neutral) at 
the inverter, and the neutral within the AC module is isolated from ground.   

•

The AC module must be connected to a dedicated branch circuit from an AC supply 
system with the neutral referenced to ground at the building or structure electrical 
service entrance. 

•

  The connector on the AC interconnecting cables is rated for disconnect under load and 
can be used as an NEC disconnect device. Some AHJs might require a separate 
disconnect next to the AC module system as well as a readily accessible disconnect.   

•

The AC cables and connectors are listed for outdoor use, are rated for 20A, and have 
insulation rated to a minimum temperature of 90C. These cables are listed for use with 
AC modules.   

•

The AC dedicated branch circuit wiring from the readily accessible disconnect to the AC 
module array must include an equipment grounding conductor (EGC) run in the same 
raceway or cable as the AC circuit conductors. This EGC must be connected to the green 
colored conductor of the transition cable, which is part of the AC module interconnecting 
cable system. 

•

The AC module interconnecting cable system provides an internal EGC for grounding the 
AC modules only. Other metal structures, such as mounting systems, must be grounded 
per code.   

•

If a module is removed from within the string, it is recommended that you bridge the 
gap in the string using an AC extension cable. Inserting an extension cable maintains 
ground continuity to subsequent modules in the string. See "AC Wiring Accessories" on 
page 27 for a list of available extension cables. Other auxiliary grounding methods may 
be used. 

•

The metal components of the AC module, including frame and microinverter, can reach 
temperatures of approximately 80C or more under extreme environmental conditions. 
To reduce risk of burns, use appropriate safety procedures when handling.   

CAUTION: To reduce the risk of fire, connect only to a circuit that has a dedicated 20 amperes 
maximum overcurrent protection in accordance with the National Electrical Code, ANSI/NFPA 
70.