Existing raceway and strapping

[don_resqcapt19]

I’ll have to remember that. Neve attached to metal corrugated roof before.
Makes sense though

Never did that, but we often ran the EMT on top of the bar joists that supported the corrugated roof deck before they changed the code to require that the EMT be at least 1.5" below the lower part of the corrugations.

 

[hillbilly1]

I think if it was installed before the code change, as long as you install the new conduits as the other inspectors you talked to, it would be legal. You go over his head, and if you win, then be ready for him to nit pick the rest of your installation. Choose your battles wisely.

 

[ActionDave]

My question still remains. The emt conduit raceway is existing and strapped to corrugated ceiling and then drops down to junction box on wall that is 10’ below corrugated ceiling. Can we tap into junction box with existing wires without having to lower the existing raceway to comply with 300.4? Inspector is says that if we tap into junction box we are adding on to circuit (which isn’t even being used) and need to bring entire taceway that is strapped to ceiling up to code. I have asked other electrical inspectors in neighboring cities and the said it is perfectly fine to tap into an existing junction box whose raceway is strapped to corrugated ceiling as long as the new line coming out of junction box complies to 300.4. Does anyone know intent of code for conduit raceways that already exist?

My answer remains. If the install was made before the code changed then the inspector has nothing to say about it.