ECN Forum Forums General Topics of the Trade General Discussion Area Parallel Conductors low voltage DC

Anyone familiar with boat and RV wiring and paralleling conductors? Is there any issue paralleling smaller conductors like #8 or #6 to reduce voltage drop as long as the circuit is fused for the smallest conductor? Info is pretty scarce on this, I have seen it mentioned a lot on solar though.

Thinking about it, many automotive and RV circuits already have parallel negative paths through the frame.

The NEC doesn't apply here so I see no reason why you can't. I would still follow the guidelines in 310.10(H)(2)
(1) Be the same length.
(2) Consist of the same conductor material.
(3) Be the same size in circular mil area.
(4) Have the same insulation type.
(5) Be terminated in the same manner.

Yes, paralleling smaller conductors like #8 or #6 can work to reduce voltage drop, as long as the circuit is properly fused for the smallest conductor. In boats and RVs, this method is less common but still possible. Just ensure connections are secure and protected against corrosion, especially in marine environments. You're right that many automotive and RV systems already use parallel paths through the frame, so it can be similar in concept. Just double-check with any specific regulations for marine or RV wiring.

The "frame" in a car is more like the neutral bus in a panel except car folks don't care about 250.6 so ground is neutral too, including "building steel"
Some would say "electronics" might enter into it but electronics moved past that in the 70s. They are very noise tolerant and ground loops don't bother them. The legend still persists tho.