Taps, Tapping, and Tap rules

[mdprice55]

Does anybody know where I can get some good info (explanation of) taps and tap rules. What is considered tapping and what the rules are. I have never been real clear on this subject.

Also, I am looking for a good explanation of shunts and shunt trips, how they work etc.

Hope I'm not asking for too much here.

[augie47]

The commentary in the NEC Handbook has some interesting info on taps (240)
You might try "search" here for shunts and shunt trips...
(they are two completely different animals)

this thread discusses shunts vs shunt trip:
http://forums.mikeholt.com/showthrea...ighlight=shunt

[mdprice55]

Originally Posted by augie47

The commentary in the NEC Handbook has some interesting info on taps (240)
You might try "search" here for shunts and shunt trips...
(they are two completely different animals)

this thread discusses shunts vs shunt trip:
http://forums.mikeholt.com/showthrea...ighlight=shunt

That was a great thread on shunts, shunt trip breakers and the difference between them. I will be perusing the Handbook. I only have a digital copy of the handbook, and while the search feature is great, I wish I had a hard copy.

[frankgi]

Originally Posted by mdprice55

Does anybody know where I can get some good info (explanation of) taps and tap rules. What is considered tapping and what the rules are. I have never been real clear on this subject.

Also, I am looking for a good explanation of shunts and shunt trips, how they work etc.

Hope I'm not asking for too much here.

Here is a great PDF on Transformer Overcurrent Protection and also explains some of the tap configurations.

http://w3.squared.com/techlib/docdet...008926800e4da5

[fillmorr]

Tap rules were covered in the first section this year in class and looking it back up for a refresher myself but anyways here you go hope this helps

10 ft tap 240.21(B)(1)
25 ft tap 240.21 (B) (2)
100 ft tap 240.21 (B) (4)
Taps supplyinga transformer primary and secondary not over 25 ft 240.21(B)(3)
Outside taps of unlimited length 240.21(B)(5)

[nakulak]

tapping:

http://www.bing.com/videos/search?q=...55&FORM=VIRE7#