Split Bolts vs Wire Nuts on the Roof [RE-wrenches]

[Mark Byington]

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Esteemed Wrenches,
Many thanks for the insolation data for coastal locations.

On another subject, we recently had a call back on a grid tied PV system and found a split bolt in a raintight j-box on the roof that was slightly loose.  I'm thinking the stranded USE-2 had relaxed with all the temperature cycling up on the roof, and loosened the split bolt just enough to cause an intermittent.  I know the drill, tighten and loosen the bolt a few times before the final tightening, to get the strands to compress as much as possible.  But I'm wondering, do you prefer split bolts or wire nuts in this application?  Seems like wire nuts wrapped securely with rubber tape might actually be more reliable than split bolts for this small size wire (10-12AWG).
Thanks
Mark
Cobalt Power Systems

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