Sorry XHHW-2 90 degree. The lugs are rated for 90
Wire Size Using Tap Rule
- Thread starter SteveO28
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Jpflex
Electrician big leagues
- Location
- Victorville
- Occupation
- Electrician commercial and residential
I agree if a 200 ampere breaker is on the line side of the cable while fed from 3 x larger 500 kcmile wires its not a tap.
Im not sure if this is what you meant but a tap has no protection for the smaller wire at its line side other than a breaker for the larger wire it connects to at the line side. Tap terminates at OCP for overload protection at its load side of wire
Jpflex
Electrician big leagues
- Location
- Victorville
- Occupation
- Electrician commercial and residential
Egc needed to bond everything metal
Jpflex
Electrician big leagues
- Location
- Victorville
- Occupation
- Electrician commercial and residential
The pic shows service terminatinr into a 200 ampere breaker neat j box. A breaker upstream of tap doesnt make a tap
Jpflex
Electrician big leagues
- Location
- Victorville
- Occupation
- Electrician commercial and residential
I guess
It depends where the 500 kcmil in and 4/0 out is taking place. Is the 100 fused disconnect upstream on the line side of the smaller 4/0 run? If so its not a tap. If not its a tap
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
Forget the word 'service'. This is a feeder.
There is a 300A breaker supplying a long run of conductor to a distribution block, and then short runs of conductor from the block to 100A and 200A disconnects.
The short conductor runs are less than 300A ampacity. They are taps.
Jonathan
There is a 300A breaker supplying a long run of conductor to a distribution block, and then short runs of conductor from the block to 100A and 200A disconnects.
The short conductor runs are less than 300A ampacity. They are taps.
Jonathan
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
You can't use the 90 degree collum to size conductors even if the lugs are rated 90. You can next size up a 4/0 AL to 200, but a #2 is 90 which is a standard size so no higher.
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
In particular see:
If you actually have equipment where _everything_ has been rated for 90C (not just the lugs), then you can use the 90C ampacity. According to the above document no such equipment is available.
-Jonathan
If you actually have equipment where _everything_ has been rated for 90C (not just the lugs), then you can use the 90C ampacity. According to the above document no such equipment is available.
-Jonathan