Service conductor tap/ emergency panel

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RRJ

RRJ

Senior Member
Location
atlanta georgia
Occupation
Electrician
Can someone explain how a subpanel being fed from the line side of a main breaker is an emergency panel? Is this even legal? I’ve seen it twice but now I have to change the main breaker and both service conductors 2/0 and subpanel feeders #6 are terminated in the same main lugs of main breaker.


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That was permitted in the 1993 and earlier codes to supply Article 700 circuits. The two conductors in the same lug, is likely a violation unless the lugs are specifically listed for use with those two conductor sizes.

695.3(A)(1) still permits a line side connection to supply fire pumps.
 
don_resqcapt19 said:
That was permitted in the 1993 and earlier codes to supply Article 700 circuits. The two conductors in the same lug, is likely a violation unless the lugs are specifically listed for use with those two conductor sizes.

695.3(A)(1) still permits a line side connection to supply fire pumps.
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Thank you. I rather make this emergency panel a subpanel but the breakers are $1000 I line square d. I was going to put Polaris lugs but since is a service tap then the lugs have to specify that they are for service...
Im


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RRJ said:
Thank you. I rather make this emergency panel a subpanel but the breakers are $1000 I line square d. I was going to put Polaris lugs but since is a service tap then the lugs have to specify that they are for service...
Im


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I'm not familiar with that requirement. Can you elaborate
 
augie47 said:
I'm not familiar with that requirement. Can you elaborate
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Take a look at 230.46 in the 2020 code.
...
Power distribution blocks, pressure connectors, and devices for splices and taps shall be listed. Power distribution blocks installed on service conductors shall be marked “suitable for use on the line side of the service equipment” or equivalent.

Effective January 1, 2023, pressure connectors and devices for splices and taps installed on service conductors shall be marked “suitable for use on the line side of the service equipment” or equivalent.
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It appears that the Polaris connectors are wire (pressure) connectors and not subject to the rule at this time.

Edited to correct code citation from 250.46 to the 230.46.
 
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electrofelon said:
That is interesting. First I am hearing if this gem. Do I dare ask what be the substantiation is?
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The high available fault currents and the very long clearing time of the upstream utility OCPD. This results in high magnetic forces and conductors have been known to separate from their connectors from these forces. The intent is that the conductors stay in place until the fault is cleared either by the operation of the upstream OCDP or by the conductor acting as a fuse.
don_resqcapt19 said:
Take a look at 230.46 in the 2020 code.

It appears that the Polaris connectors are wire (pressure) connectors and not subject to the rule at this time.
Click to expand...
EDIT...corrected code citation ...I had 250.46....the correct citation is 230.46. Sorry for any confusion.
 
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