UF #10 ok for dryer circuit ?

[Stevenfyeager]

My customer has some UF 10-3 to use for a dryer circuit, 70 ft. run. UF rates lower in table 310.60. It says 30 amps, but it is this ok ? Thank you.

 

[infinity]

Yes you can use UF indoors. 310.60 is for Conductors Rated 2001 to 35,000 Volts. The table you need is 310.15(B)(16).

 

[Dennis Alwon]

Is it 10/3 with ground? If so not an issue. Years ago they sold 10/3 without a ground and as I don't know how long your customer had the cable I just thought I'd mention it

 

[Stevenfyeager]

Yes you can use UF indoors. 310.60 is for Conductors Rated 2001 to 35,000 Volts. The table you need is 310.15(B)(16).

yes, sorry, a typo, I had the wrong table number, I meant 310.16 (now 310.15 B 16) And thank you.

 

[Stevenfyeager]

Is it 10/3 with ground? If so not an issue. Years ago they sold 10/3 without a ground and as I don't know how long your customer had the cable I just thought I'd mention it

It's a recent purchase, with a ground. Why is is rated lower ? Because of extra thick insulation, heat build up ? Thank you

 

[electrofelon]

It's a recent purchase, with a ground. Why is is rated lower ? Because of extra thick insulation, heat build up ? Thank you

UF is rated the same as Romex, ampacity is based on the 60 degree collum.

 

[infinity]

It's a recent purchase, with a ground. Why is is rated lower ? Because of extra thick insulation, heat build up ? Thank you

It has the same temperature rating as NM cable 60° C.

334.80 Ampacity. The ampacity of Types NM, NMC, and NMS cable shall be determined in accordance with 310.15.
The allowable ampacity shall not exceed that of a 60°C(140°F) rated conductor. The 90°C (194°F) rating shall be
permitted to be used for ampacity adjustment and correction calculations, provided the final derated ampacity does not ex-
ceed that of a 60°C (140°F) rated conductor. The ampacity of Types NM, NMC, and NMS cable installed in cable tray shall
be determined in accordance with 392.80(A).

 

[kwired]

Chances are your UF cable has 90C conductors, which you can use 90C ampacity for any necessary ampacity adjustments or temperature corrections if needed, but the section Infinity mentioned still limits you to 60C ampacity for termination temp rating purposes, and does for NM cable also.

 

[Stevenfyeager]

It has the same temperature rating as NM cable 60° C.

What about fire rating ? Is UF insulation fire rated, and ok for indoors ?

 

[romex jockey]

fire rating? i'm drawing a blank Steve...... ~RJ~

 

[kwired]

What about fire rating ? Is UF insulation fire rated, and ok for indoors ?

It may have better smoke and flame resistance than other common plastics, but isn't "fire proof or fire resistant". Is probably roughly equal to NM cable. Individual conductor insulation is very likely the same thing.

 

[MAC702]

Don't confuse jacket/sheathing material to insulation material. That said, your question is still valid about the sheathing difference. That said, UF has to be fine indoors, because it's what you use when you start indoors and go outdoors/underground without splicing.

 

[Jraef]

Personally I don't like using UF indoors simply because it's a PITA to strip compared to NM, but that's just me... There is no legal prohibition from using it the same as NM.

 

[Chamuit]

Personally I don't like using UF indoors simply because it's a PITA to strip compared to NM, but that's just me...

Amen, Brother!

:lol::lol:

 

[LarryFine]

Personally I don't like using UF indoors simply because it's a PITA to strip compared to NM, but that's just me...

The Klein NM stripper works surprisingly well on UF.