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Old 02-06-2009, 11:15 PM   #61
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Installing Service In Shed.


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Originally Posted by Stubbie View Post
Or a sub-feed tap at the service equipment (if outside) and then the appropriate main breaker disconnect at the sub panel.
In this scenario where you have an un-fused disconnect at the source (the service equipment) and then feeding a main panel with the appropriate sized main breaker the wire feeding that main breaker must be sized to the service, not what ever load you plan to put on the panel.

In other words; the above mentioned method would NOT work with 6 gauge wire feeding a main panel off a 100 amp service with a non-fused disconnecting means at the source/service equipment.

I am sure you know this, just pointing it out for anyone that may stumble upon this.

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Old 02-06-2009, 11:46 PM   #62
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Installing Service In Shed.


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Originally Posted by theatretch85 View Post
In this scenario where you have an un-fused disconnect at the source (the service equipment) and then feeding a main panel with the appropriate sized main breaker the wire feeding that main breaker must be sized to the service, not what ever load you plan to put on the panel.

In other words; the above mentioned method would NOT work with 6 gauge wire feeding a main panel off a 100 amp service with a non-fused disconnecting means at the source/service equipment.

I am sure you know this, just pointing it out for anyone that may stumble upon this.
Not quite correct. This would be true if you were feeding thru to an mlo panel in the same structure load side of the service equipment or tapping at the meter base line side of the service equipment. The unlimited tap rule NEC 240.41(B)(5) allows you to tap the load side of the service disconnecting means if located outside and run conductors as far as you want as long as they are protected from physical damage and they terminate on a single overcurrent device that limits the ampacity to that of the tap conductors. The overcurrent device can then supply any number of overcurrent devices on its load side. So I could use a sub-feed plug or a lug tap kit use #6's and land on a 60 amp breaker using thwn in conduit 75C terminations. If i were to use UF I'd land on a 50 amp breaker. You cannot use the next size up rule with taps.
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Last edited by Stubbie; 02-07-2009 at 12:24 AM.
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