RMC + concrete = rust

[electricalperson]

another thing to add to my earlier post..i only do that if i have to come up in a place where it might get bumped. like on the wall or something like that. if i go up inside of a piece of switchgear or large panel thats close to the ground i dont bother doing that just if i have too

 

[daleuger]

Could you imagine Al and Barry in the same ditch?

 

[RUWired]

Bitumastic is often speced to this day. Years ago you could catch a wicked case of cancer if you used it in California. Not sure if that is still the case.

When specified we use bituminous asphalt sealer and roof pitch. It sticks real good to rigid or imc.

 

[chris kennedy]

When specified we use bituminous asphalt sealer and roof pitch. It sticks real good to rigid or imc.

Never seen it speced other than penetrating a slab, but I have done very few service drops.

 

[glene77is]

Guess I was beaten to the punch!!!

I know a lot of electricians who have never had a chance to work with it or even seen Rob Roy before, thanks for providing the link

Thanks for the definition and the link to "Plasti-Bond Red Hot" coatings.

There have been things that I've read about in these forums
which I will never encounter on the job. Good Forums!

By the same token, there are things that I have worked with
which 'electricians' will never encounter. The world is bigger than life!

Thanks for the definition.

 

[benaround]

In Arizona we use 20 mil tape on all rmc in the ground and up to when it passes grade or

slab.

note: This is the tape you have been talking about, it is equivilent to other spec. coatings.

 

[arossi]

The biggest reason I would suggest the rob roy over anything else - In my part of PA I've seen rigid rot out in plain dirt, concrete, and under a building slab which should typically be dry. So if I can't run PVC that is what I push for. Not saying I always win the argument though.

 

[weressl]

Where rigid comes through the floor do you tape it or coat or protect it in some way to prevent it from rusting at that point?

We have been using stainless for rigindity at the floor level and converting to PVC in the duct bank.