I dont know of any either, hence the reason for this thread, I heard it being discussed again last week.

We install 25mm PVC conduit, from the roof down to the PVC trunking around the inverter and battery, if the panels are 460 watt, generally for domestic, we install 2 x 4 mm sq solaflex double insulated wire (red/black) in the same conduit with the earth wire all in the same pipe per string... 4 strings 4 x 25 mm pvc conduits.

I am starting to think it is such a waste to run 1 earth wire per string, all we are doing is bonding the rails and panel frames.

2 double insulated wires (which dont even need to be in a conduit) in a 25 mm PVC conduit, with 1 x separate 6 mm earth wire for the bonding (not lightning protection) strapped to the pvc conduit should be fine.

Quote Originally Posted by GCE View Post
What regulation states it must be in a metal wire way ? I know of no such reg