Existing residential range circuit

[dm9289]

I was in 110.14 and was a little confused about a situation I seen in an existing installation of a Range (range not present).

150amp service. Range breaker 50amp rated 75c. Aluminum cable rated 90c. Range receptacle rated 75c.

I think the installer was correct to use the wire at 75c -50amp rating instead of 60c- 40amp because panel, breaker and receptacle are rated for 75c.


Your input always appreciated

 

[Jake@01]

I don't do much residential work so I may be wrong. I thought u were supposed 2 use the 60% column when using NM cable.

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[Seven-Delta-FortyOne]

Since you said aluminum, I’m guessing it’s not NM, but rather SER?

 

[dm9289]

Since you said aluminum, I’m guessing it’s not NM, but rather SER?

yes it is SE cable 3338.10(A)4 has seemed to change from 2014 to 2017 but i, a little confused by language.

In 2014 it looks like 60c only but in 2017 it looks like for over 10awg OK

 

[dm9289]

I don't do much residential work so I may be wrong. I thought u were supposed 2 use the 60% column when using NM cable.

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Its SE cable

 

[Jake@01]

So 338.10(B) 4 says 60% for type SE cable in 2017 nec. There may be exceptions however I didn't look much further.

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[JetStream]

Starting with 2017 I believe the 60C limit only applies to 10 AWG and smaller and even then, only when in contact with insulation, whatever that means.

 

[wwhitney]

So 338.10(B) 4 says 60% for type SE cable in 2017 nec. There may be exceptions however I didn't look much further.

The 2017 added the qualification "For Type SE cable with ungrounded conductor sizes 10 AWG and smaller" to that limitation. So #8 and larger SE cable can use the 75C ampacity.

Cheers, Wayne

 

[dm9289]

The 2017 added the qualification "For Type SE cable with ungrounded conductor sizes 10 AWG and smaller" to that limitation. So #8 and larger SE cable can use the 75C ampacity.

Cheers, Wayne

Thats how i seen it also

 

[dm9289]

Starting with 2017 I believe the 60C limit only applies to 10 AWG and smaller and even then, only when in contact with insulation, whatever that means.

Yes that part of the sentence was odd to me also

 

[LarryFine]

There's always the option of using a 40a breaker if you have to.

I noticed the OP never mentioned the conductor size.

 

[James L]

Starting with 2017 I believe the 60C limit only applies to 10 AWG and smaller and even then, only when in contact with insulation, whatever that means.

When you wire a 20 amp circuit, such as kitchens, dining rooms, bathroom receptacles, etc...there is always the possibility that your circuits will run through an attic or outside wall - thus insulation

In those cases, the heat from the cable cannot dissipate easily. So the ampacity should be lowered to account for hotter conductors

 

[dm9289]

There's always the option of using a 40a breaker if you have to.

I noticed the OP never mentioned the conductor size.

it was #6 aluminum

 

[LarryFine]

it was #6 aluminum

I would use a 40a breaker if there's still any concern.