SER&UF in same conduit

[eljefetaco]

I have a question I cannot find the answer.

100amp SER and two 14/3 UF in a 1 1/4” PVC conduit from a ATS to attic with expansion coupling. No LB just a 90.

inspector informs us he will fail it if we do it again. Doesn’t make sense. It’s either a code violation or not. Why pass it this time? Was not on site to ask for reference. What am I missing?

 

[infinity]

Sounds like a few possibilities. One your raceway is too small and two you did not derate for more than 3 CCC's in a raceway? What size SER?

 

[LarryFine]

inspector informs us he will fail it if we do it again. Doesn’t make sense. It’s either a code violation or not. Why pass it this time? Was not on site to ask for reference. What am I missing?

Ask for the code reference, even on the phone. You can't correct what you don't know is wrong.

 

[GoldDigger]

If the SER carries POCO service conductors and the UF originates on the load side of the service disconnect OCPD , that is a clear violation that should never be "excused" as it is a safety hazard.

Sent from my Pixel 4a using Tapatalk

 

[Dennis Alwon]

If the SER carries POCO service conductors and the UF originates on the load side of the service disconnect OCPD , that is a clear violation that should never be "excused" as it is a safety hazard.

Sent from my Pixel 4a using Tapatalk

It sounds like the ser is a feeder from the transfer switch-- SER is 4 wires so that is my thinking. I am trying to understand why there is 2- 14/3UF cables in a transfer switch....

 

[infinity]

It sounds like the ser is a feeder from the transfer switch-- SER is 4 wires so that is my thinking. I am trying to understand why there is 2- 14/3UF cables in a transfer switch....

Until the OP comes back with some more information we're just here guessing.

 

[LarryFine]

It sounds like the ser is a feeder from the transfer switch-- SER is 4 wires so that is my thinking. I am trying to understand why there is 2- 14/3UF cables in a transfer switch....

I believe that's what was chosen for control wires.

 

[qcroanoke]

It sounds like the ser is a feeder from the transfer switch-- SER is 4 wires so that is my thinking. I am trying to understand why there is 2- 14/3UF cables in a transfer switch....

Controls? Battery charger/heater?

 

[eljefetaco]

Not service entrance. The SER is the feed from generator (residential) the (2) 14/3 uf are control wiring for a Generac generator. Pretty simple. And yes 14/3 uf is over sized. Why can you hit put ser and UF in a pipe? Pvc

 

[eljefetaco]

Controls? Battery charger/heater?

Yes. The basic generator wiring for Generac.

 

[infinity]

Not service entrance. The SER is the feed from generator (residential) the (2) 14/3 uf are control wiring for a Generac generator. Pretty simple. And yes 14/3 uf is over sized. Why can you hit put ser and UF in a pipe? Pvc

You can (unless the controls are Class2 only) but you're saying that you're being told that it's a violation but no one knows what code section is being violated.

 

[eljefetaco]

If the SER carries POCO service conductors and the UF originates on the load side of the service disconnect OCPD , that is a clear violation that should never be "excused" as it is a safety hazard.

Sent from my Pixel 4a using Tapatalk

Ser is nor SE.

 

[eljefetaco]

Sounds like a few possibilities. One your raceway is too small and two you did not derate for more than 3 CCC's in a raceway? What size SER?

It’s the true 100amp think 3 #1AL and I #6Al
Was thinking conduit fill but you can derate the 14/3 all day.

 

[sw_ross]

Let us know what the violation is when you contact the AHJ I’ll be interested to hear

 

[infinity]

It’s the true 100amp think 3 #1AL and I #6Al
Was thinking conduit fill but you can derate the 14/3 all day.

You need to find the diameter of the SE cable add to that the diameter of the 2 UF cables (as if they were round) and see if you have exceeded 40% raceway fill.

 

[electrofelon]

You need to find the diameter of the SE cable add to that the diameter of the 2 UF cables (as if they were round) and see if you have exceeded 40% raceway fill.

Im going to say its way over.

 

[Strombea]

338.12(2)
I have never and don't think it's ok to use SER underground. Why wouldnt you use thhn

but yes UF can go in same conduit as feeders but not with service conductors as previously mentioned.

we use a 18-7 landscape type wire for controls if under 120 ft

 

[Strombea]

338.12(2)
I have never and don't think it's ok to use SER underground. Why wouldnt you use thhn

but yes UF can go in same conduit as feeders but not with service conductors as previously mentioned.

we use a 18-7 landscape type wire for controls if under 120 ft

Sorry I just realized it wasn't underground...

I guess there is no violation.

 

[LarryFine]

we use a 18-7 landscape type wire for controls if under 120 ft

Uh, oh. You might want to reconsider if you're talking about sprinkler-system cable.

"Southwire Sprinkler System Wire is suitable for direct burial on applications up to 30 volts"

From: https://images.homedepot-static.com/catalog/pdfImages/02/028a5a27-5b71-4482-8d8d-b4f1aa1e6738.pdf

 

[Eddie702]

Aside from the conduit fill issue and derating i think your ok. OP said "100amp SER" what size is that? If it's #2 that may not be allowed unless it supplies the entire load of the house