Does "concrete-tight" include "direct burial"?

[renosteinke]

"Concrete tight" is acceptable for 'direct burial.' All they're concerned about in 'concrete tight' is keeping the cement fines out, lest the pipe be filled with cement. Water can enter.

I'd say anything that will keep cement fines out will also keep out ordinary dirt.

The pipe's not there to keep electricity and water apart; that's what the insulation is for.

Water-tightness (or rain-tightness) of fittings was never an issue as for the pipe; the concern was where the fitting might attach to a panel, or other place where there are exposed electrical components.

Note that the use of RMC, as with ANY conduit or cable, is limited to 'where suitable.' If the conditions are too corrosive for steel then steel conduit is not acceptable. At this point the electrician and the AHJ simply MUST look at past local experience for guidance. (Even Chicago will allow PVC in specific industrial settings). In the case of direct burial, it's very possible that the addition of pipe-wrap tape to any conduit within a foot of the surface is all that is required.

Referencing another thread, inside a sewage pit is another location where steel has a very limited life.

 

[steve66]

So it sounds like "concrete tight" does not necessarily include "direct burial".

But it also sounds like you can install your ericson underground just like you can install a RMC coupling underground because of 344.10 which Bob quoted.

Does that sound right?

Steve

 

[iwire]

If the fitting is listed for use with RMC and is Galvanized Steel, Stainless Steel or Red Brass it is automatically OK for DB.

See 344.10(B).

 

[sparkyguy545]

Sounds like iwire found the "magic text".
At least, it sums it up as best as I can see it.

 

[Pierre C Belarge]

If the fitting is listed for use with RMC and is Galvanized Steel, Stainless Steel or Red Brass it is automatically OK for DB.

See 344.10(B).

Except on the West Coast, there is a 15 second delay...

Ya know, those laid back boys.

 

[kwired]

"Concrete tight" is acceptable for 'direct burial.' All they're concerned about in 'concrete tight' is keeping the cement fines out, lest the pipe be filled with cement. Water can enter.

I'd say anything that will keep cement fines out will also keep out ordinary dirt.

..

so a fitting listed as concrete type when taped is also acceptable for direct burial if taped??

Cement fines only need to be kept out long enough for the concrete to cure. Ordinary dirt will need to be kept out for a much longer time.

Water-tightness (or rain-tightness) of fittings was never an issue as for the pipe; the concern was where the fitting might attach to a panel, or other place where there are exposed electrical components.

That is why 225.22 and 230.53 state that raceways shall be arranged to drain.