hardworkingstiff
Senior Member
- Location
- Wilmington, NC
OK, everyone knows I use W cable at marinas and I've been using table 400.5(B) for ampacities. Now I understand that I'm limited to table 310.16 ampacities because of 110.14(C)(1). I believe it has been presented that splicing a piece of THWN (with 310.16 ampacity selection) onto the W cable (400.5(B) ampacities) before the termination (breaker) will bring the termination into compliance with 110.14(C)(1) for the breaker. {If I've misunderstood what was posted on this site, please correct me}.
At the marine power center it's just not pratical to make this same splice at the busbar of the power center. Another thought came to mind. The busbar is rated for 250-amps (I believe) and 75C (maybe 90C) connections. If we are wiring a piece of #4 W cable with OCP of 100-amps (allowed by table 400.5(B)) and landing it (with proper ring terminals) on the 250-amp rated busbar, are we OK since the busbar won't heat up at 100-amps (being it's rated 250-amps), the cable is rated for 100-amps (at 75C), the ring terminals are rated 90C+?
I don't see this as a problem, but I don't know if will comply with the "letter of the law".
Comments please/thanks,
At the marine power center it's just not pratical to make this same splice at the busbar of the power center. Another thought came to mind. The busbar is rated for 250-amps (I believe) and 75C (maybe 90C) connections. If we are wiring a piece of #4 W cable with OCP of 100-amps (allowed by table 400.5(B)) and landing it (with proper ring terminals) on the 250-amp rated busbar, are we OK since the busbar won't heat up at 100-amps (being it's rated 250-amps), the cable is rated for 100-amps (at 75C), the ring terminals are rated 90C+?
I don't see this as a problem, but I don't know if will comply with the "letter of the law".
Comments please/thanks,