Roof J-box for solar - what splicer?
Need some education. Getting all the pieces. Have a 4*2" waterproof PVC combiner box, will run AWG 12 from panels in box, and AWG 8 out to controller. Will use mechanical splicers, for lack of experience.
I can use either these Ground bus bar
- it can be screwed to the bottom so the screw will puncture another hole in the roof, don't need more holes.
Or these Splicer-reducer
- can't be screwed to bottom.
Q1: which terminal is better? Splicer is - I think - 1.25" long (Home Depot specs are meaningless), so the wire has 1" length inside - good. The box is mere 3.75"x3.75" inside, inserting the wires in the ends will be a tight spot. Bus bar is easier to access, but the wire has mere 0.5" (?) length inside, less contact.
Q2: What if I glue the splicer or bus bar to the bottom? And wedge a wood block between them, to prevent accidental short? Somebody did exactly this, I can't remember who. Initial plan was to wrap the terminal in rubber tape and let it hang in the air, then it would be easier to bend/insert the wire in the ends in case of a splicer.
I can use either these Ground bus bar
- it can be screwed to the bottom so the screw will puncture another hole in the roof, don't need more holes.Or these Splicer-reducer
- can't be screwed to bottom. Q1: which terminal is better? Splicer is - I think - 1.25" long (Home Depot specs are meaningless), so the wire has 1" length inside - good. The box is mere 3.75"x3.75" inside, inserting the wires in the ends will be a tight spot. Bus bar is easier to access, but the wire has mere 0.5" (?) length inside, less contact.
Q2: What if I glue the splicer or bus bar to the bottom? And wedge a wood block between them, to prevent accidental short? Somebody did exactly this, I can't remember who. Initial plan was to wrap the terminal in rubber tape and let it hang in the air, then it would be easier to bend/insert the wire in the ends in case of a splicer.
