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Old 10-10-2007, 05:40 AM   #1
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Proper splicing thnn/thwn

I'm running a 4 wire circuit to a new spa. The first 25 feet runs above ground in schd 80 pvc conduit from my 200 amp main to a junction box. At this point I plan on going underground in 1-1/2 pvc. How would I splice the #4str cu cable? Are split bolts OK? Compression splices? I have looked over quite a number of posts but have not found the information I need.

Recommendations are appreciated.


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Old 10-10-2007, 06:01 AM   #2
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I use NSI Polaris Insul-Taps for anything over #8. WAY fast & easy and super clean.


Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
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Old 10-10-2007, 07:49 AM   #3
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Speedy showed these to me a few years back and they are the cats meow and worth the cost.

Only question I have is why are you splicing is it length of run and wire too short?
" One nice thing about the NEC articles ... you have lots of choices"

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Old 10-10-2007, 01:23 PM   #4
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I just about used either split bolt or insluated taps but right now i am more on inslusated taps it work much faster than the split bolt methold useally about 1/4 of the time compared to old school methold [ split bolts] and much neater apparince as well

Merci, Marc
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Old 10-10-2007, 05:45 PM   #5
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Polaris taps are the best for the DIYer... Very easy and self explanatory. Split bolts are just as effective and safe IF you know what kind of tape ( thick rubber splicing tape, and regular electrical tape) to buy and are careful making the splices.
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Old 10-11-2007, 05:04 PM   #6
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Don't splice them.

A. Pull from the JB to the panel and from the JB to the spa.

B. If applicable, mount a GFCI disconnect instead of the JB and terminate them.
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Old 10-12-2007, 10:51 AM   #7
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This must be a monster of a spa. 1-1/2" conduit. What size conductors are you pulling?


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