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Old 04-17-2012, 11:37 AM   #21
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What happened to English?
English who ? I don't recognise that screen name. Is that one of Peter's aliases ?

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Old 04-17-2012, 02:34 PM   #22
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Why would you run 2 #12 wires? Your feed goes to a disconnect, most service receptacles I see are tapped off the top of that disconnect. Rarely do I ever see a service receptacle run seperately to the RTU.
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Old 04-17-2012, 03:06 PM   #23
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Ahhh..... Got it , but Pete isn't considering the #12's ?
Didn't really need to.

250.122 Size of Equipment Grounding Conductors.
(B) Increased in Size.
Where ungrounded conductors are
increased in size, equipment grounding conductors, where
installed, shall be increased in size proportionately according

to the circular mil area of the ungrounded conductors.

This section doesn't care why you increased the size of the ungrounded conductors.

Pete
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Old 04-17-2012, 03:38 PM   #24
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Didn't really need to.

250.122 Size of Equipment Grounding Conductors.

(B) Increased in Size.
Where ungrounded conductors are
increased in size, equipment grounding conductors, where
installed, shall be increased in size proportionately according
to the circular mil area of the ungrounded conductors.

This section doesn't care why you increased the size of the ungrounded conductors.

Pete




310.15 (B) (3)a ?
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Old 04-17-2012, 04:20 PM   #25
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310.15 (B) (3)a ?
[/left]
I'm not seeing how that has a bearing on the EGC? Unless I am mistaken (and I have made more than one) nothing in 310.15(B)(3)(a) would change the requirement of 250.122(B).

Pete
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Old 04-17-2012, 05:06 PM   #26
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I'm not seeing how that has a bearing on the EGC? Unless I am mistaken (and I have made more than one) nothing in 310.15(B)(3)(a) would change the requirement of 250.122(B).

Pete
Using #1 cu gives you 115A using 90c column, 4 or more conductors using 80% per
310.15 (B) (3) (a) gives you only 92A
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Old 04-17-2012, 05:24 PM   #27
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Using #1 cu gives you 115A using 90c column
You sure you arent looking at aluminum conductors?
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Old 04-17-2012, 05:33 PM   #28
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Using #3 cu gives you 115A using 90c column, 4 or more conductors using 80% per
310.15 (B) (3) (a) gives you only 92A
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You sure you arent looking at aluminum conductors?
Sorry #3 cu is what I meant
Last edited by dronai; 04-17-2012 at 05:37 PM.
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Old 04-17-2012, 05:34 PM   #29
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Assuming your terminations are good for 75 degrees #3 copper would have sufficed based on 100 being the MCA.

Pete

This post is what I'm referring to
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Old 04-17-2012, 05:36 PM   #30
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Sorry #3 cu is waht Pete said to use.

[/left]


I rarely listen to what Pete says either.

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