We use PV Wire which is double insulated on the roof in free air and regular THHN/TNWN for the run from the junction box back to the inverter (using no white or gray wires of course).
Thanks, Will __________________________________________________________________________________________ Will White Regional Field Operations Manager - New England Real Goods Solar 64 Main St. Montpelier, VT 05602 Tel: (802) 223-7804 Cell: (802) 234-3167 www.realgoodssolar.com<http://www.realgoodssolar.com/> From: [email protected] [mailto:[email protected]] On Behalf Of Marco Mangelsdorf Sent: Friday, June 28, 2013 1:10 PM To: 'RE-wrenches' Subject: [RE-wrenches] double insulated wire I'm kinda confused. With more transformerless inverters on the market (e.g., SMA and Power-One), it's not clear to me if double insulated wiring needs to be used all the way from each series string to their respective inverter. We've been installing the P1 3-6 kW TL inverters and there's no apparent mention of needing to use such conductors, yet I remember needing to do so when I installed a number of the 8, 9 and 10 kW SMA TL inverters. Thanks, marco
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