SIS wire type permitted in conduit runs?

[emiller233]

Need some help, not sure where to look to see if SIS wire type permitted in RMC conduit runs? It could be in some nema 4 wire way as well?

The customer specs out the SIS wire type (nuclear installation) but also is asking for confirmation that it is permitted to use in the conduit.

wire
https://www.awcwire.com/part.aspx?partname=sis-12-65t

 

[augie47]

iN 310.104 it's listed for "SWITCHBOARD AND SWITCHGEAR WIRING ONLY" which would seem to preclude conduit wiring.
however
If it's a nuclear installation it may be under guidelines (Federal) other than the NEC

 

[rbalex]

See Table 310.104(A). It is possible the wire is multi-labeled, but if it is SIS only, it is for switchboards and switchgear only.

 

[emiller233]

I will have to wait till I get to work in the morning to get my hands on the code book.
But does the [FONT=&quot]XLPE insulation means it’s dual rated?[/FONT]

 

[rbalex]

I will have to wait till I get to work in the morning to get my hands on the code book.
But does the XLPE insulation means it’s dual rated?

Not in and of itself. That is a determination of the NRTL.

 

[kwired]

I will have to wait till I get to work in the morning to get my hands on the code book.
But does the XLPE insulation means it’s dual rated?

XLPE means cross link polyethylene, which is different base material than PVC based types. There are still several possible ratings it could be in the XLPE family.

 

[rbalex]

SIS is very flexible - and soft - and not generally suitable for pulling through a raceway.

 

[emiller233]

i've never seen it or heard of it before this. makes sense whys its not rated for conduit use then...

anyone know what i could use for an alternative wire that is PVC free (and preferably halogen free)

 

[rbalex]

As kwired mentioned XLPE is available in several constructions, so is EPR (ethylene propylene rubber). I personally prefer XHHW-2.

 

[emiller233]

ok, great! I'lll start looking into this. thanks for all of the help guys!

 

[SparkEnuke]

Late posting

Late posting

I may be a little late posting this, but the nuke plants that I've worked at only used SIS in short runs (like in flex for the last few feet) or within panels. They typically have specs or drawings with their approved wire and cables (all non-PVC) that you can choose from for use in raceway. Adding a new cable typically requires a change to that spec or drawing as part of the engineering change process, so it's a lot easier to use one they've already approved.

Just an FYI from my experience, nuke plants love that they are exempt from NEC (being a generating facility). Many even in the design departments know very little about it.