PVC Flex Conduit

[FaradayFF]

Greetings,
Have you used a non-conductive flexible conduit in the past where electrical isolation was required for a piece of equipment that conduit connected to? In theory this should work, I'm considering using a non-conductive conduit to connect to a structure that needs to be insulated from ground.
Thanks,
EE

 

[texie]

If the supply system is a grounded system this would be unsafe. What is the application?

 

[Dsg319]

Greetings,
Have you used a non-conductive flexible conduit in the past where electrical isolation was required for a piece of equipment that conduit connected to? In theory this should work, I'm considering using a non-conductive conduit to connect to a structure that needs to be insulated from ground.
Thanks,
EE

I’ve worked on some AOV’s (air operated valves). All 24volt dc. open and close solenoids and limit switches, where that section of pipeline is not isolated from the cathodic protection on the rest of the line.

Most always in a class 1 div1 area for my case so always had to use explosion proof fittings. So no non-metal flex but have used a plastic or some other type material isolation coupling. Looks just like a threaded GRC coupling but black.

Always been told not to land the EGC for obvious reasons. But i still would if it were alternating current than would just have to find a gadget that blocks dc current but allows ac fault current. There out there I just don’t quite know the name.

 

[Frank DuVal]

Capacitor.

 

[paulengr]

Only reason to use an isolator specifically designed for that purpose is that almost all plastics are”compounded”. Fillers and modifiers are added for chemical and sunlight resistance, strength, etc. Many of these are not insulators. So it’s not that what you are suggesting can’t work but if you buy and use an isolator built for the purpose you are assured it will work compared to something that may work. It’s not expensive.

Capacitive isolators are built specifically for breaking the DC current path and passing AC and vice versa. The actual DC blocking device is a capacitor and the AC blocking one is a choke (inductor).