Tri-plex

[dhducati]

Unless that USE was cross rated as RHH or RHW, it's not allowed to be used inside a dwelling.

As far as using USE (Tri-Plex) in a service mast, I've done it in the past, without question....
I've only recently considered the question of the sunlight resistance rating of the cable when used this way, and understand that technically, it's not allowed for this use.

I will say that I've never seen or experienced any problems with this type installation,
I used USE for the service on my own shop.
It's now 20 years old, and looks as good as new, although it's in direct sunlight.
But.....rules being rules....I won't use it for this purpose any more.

steve

The extract from the UL white book posted earlier does say that it is suitable for use when exposed to sun, so it shouldn't degrade in direct sunlight. Perhaps this is to allow underground services that emerge at the pole for hookup to an overhead transformer?

 

[dhducati]

I'm a little confused, now. I've seen this used as feeder to subpanels inside premises. Comments?

Mobile home feeder is a better choice since it is also rated RHW

 

[charlie]

Mobile home feeder is a better choice since it is also rated RHW

Mobile home feeder is a better choice since it may be rated RHW also! :smile:

 

[dhducati]

Mobile home feeder is a better choice since it may be rated RHW also! :smile:

I usually see mobile home feeder running underground from an outdoor meter/disconnect to an indoor panel, so in this application it needs to be rated to allow use inside the premises. Doesn't have to be RHW, but needs to be something other than (or in addition to) USE.