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#89759 - 10/18/04 02:19 PM Tap existing service  
nojkj  Offline
Junior Member
Joined: Oct 2004
Posts: 6
Hi I got this question on test

Tap existing service to new location
1 special permission
2 used approved material for connection I put only no 2 but what do you think.
a) only no 1
b) only no 2
c) both 1 and 2
d) neither 1 or 2 ( I put b but my feeling it is c but I do not find anything in the code that support than
Thanks Jon


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#89760 - 10/19/04 04:32 PM Re: Tap existing service  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 822
Michigan
230.46 is all I can think Of? 2002 N.E.C.


#89761 - 10/19/04 05:47 PM Re: Tap existing service  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
No. See 230.40 exception 2.
This is kind of a trick question though. A service conductor can never really be "tapped", since there is no way to meet the definition of a tap with a service conductor in 240.2. The only true "taps" allowed in the NEC are for feeders and (under rare circumstance) branch circuits.

If you are asking if you can install a second set of service entrance conductors on one service, the answer is yes, using the above cited reference. Be careful to satisfy the requirement of conductor per terminal in 110.14, as I have not seen a meter enclosure that has provisions for two condutors per leg and per nuetral.

I would answer "D" and then I would jot down the question number to use as a challenge in case you get it wrong, citing 240.2, definition.

[This message has been edited by Ryan_J (edited 10-19-2004).]


Ryan Jackson,
Salt Lake City

#89762 - 10/19/04 07:37 PM Re: Tap existing service  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 822
Michigan
Definitions. Service conductors(Service Point to service Disconnecting means)
Say you Run 500s to a Wireway Then (TAP) 4 100 amp SERVICE disconnecting means off The 500s (allowed up to six same location(230.71)
By code that IS allowed and commomly used .


#89763 - 10/19/04 08:10 PM Re: Tap existing service  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 822
Michigan
Point of Info See N.E.C. 2002 Analysis of Changes put out by I.A.E.I. Page 90 in reference to 230.46 Shows an Example of what I said in the pervious post.


#89764 - 10/19/04 09:20 PM Re: Tap existing service  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
I do it a lot, and require no special permission, and yep more than six would require a fused main disco. In some areas special permission may be required. So I say #2 is a viable answer.

Quote
230.46 Spliced Conductors.
Service-entrance conductors shall be permitted to be spliced or tapped in accordance with 110.14, 300.5(E), 300.13, and 300.15.
Splices are permitted in service-entrance conductors if the splice meets the requirements of 230.46. Splices must be in an enclosure or be direct buried using a listed underground splice kit. It is common to have an underground service lateral terminate at a terminal box either inside or outside the building. At this point, service conductors may be spliced or run directly to the service equipment.
Splices are permitted where, for example, the cable enters a terminal box and a different wiring method, such as conduit, continues to the service equipment. Splices are most common where metering equipment is located on the line side of service equipment, service busways, and taps for supplying up to six disconnecting means.


Mark Heller
"Well - I oughta....." -Jackie Gleason

#89765 - 10/19/04 09:23 PM Re: Tap existing service  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
I usually do it in a gutter, or can, prior to multiple meter/main panels. Our utility only requires provision for a wire seal.


Mark Heller
"Well - I oughta....." -Jackie Gleason

#89766 - 10/19/04 10:09 PM Re: Tap existing service  
nojkj  Offline
Junior Member
Joined: Oct 2004
Posts: 6
Thanks Its litle confusing but the answer are either b or d but its hard to tell because there is nowhere talked about existing service in the code but 230 33 and 230 46 talk about tapped and after reading 240 2 b.


#89767 - 10/20/04 09:19 AM Re: Tap existing service  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
It is impossible to meet the definition of tap with a service conductor since it is specifically addressed in the definition of tap.

If the question is can I splice, the answer is yes. If the question is can I tap, the answer is no.


Ryan Jackson,
Salt Lake City

#89768 - 10/20/04 09:47 AM Re: Tap existing service  
nojkj  Offline
Junior Member
Joined: Oct 2004
Posts: 6
Hi and thanks for your response you would say No to tap even after reading 230 33 230 46 where is talk about both spliced or tapped??
Thanks Jon


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