RGS Per Code

[mstrlucky74]

Do these conduits from the CT/switch down to the switchgear(feeder tag 3000) have to be RGS by code? Thanks

 

[infinity]

Which conduits?

 

[don_resqcapt19]

There are very few code rules that require rigid conduit, but that is often required by the project specs.

 

[GoldDigger]

There are very few code rules that require rigid conduit, but that is often required by the project specs.

One possibility is for masts supporting a service weatherhead. But that may also be just a POCO policy.
Possibly fire pump wiring?

 

[mstrlucky74]

Which conduits?

The one tagged 3000...from cellar level CT, down. My engineer sad no although he didn't seem all that positive.

 

[mstrlucky74]

There are very few code rules that require rigid conduit, but that is often required by the project specs.

Very true regarding specs. Good tidbit to know about NEC and rigid. Thanks

 

[gadfly56]

One possibility is for masts supporting a service weatherhead. But that may also be just a POCO policy.
Possibly fire pump wiring?

Fire pump wiring inside the electrical room or inside the fire pump room can be MC. Outside those two spaces, GRC alone won't be sufficient to meet the 2-hour survivability requirement.

 

[infinity]

The one tagged 3000...from cellar level CT, down. My engineer sad no although he didn't seem all that positive.

Unless it's a spec for RMC, EMT should be fine.

 

[cpinetree]

Check your POCO manual, ours requires RGS between meter and CT cabinet.

 

[Dennis Alwon]

I still don't understand why PVC isn't used. Rigid gives a parallel neutral so it would seem like it is better to have pvc. I guess there have never been bad effects from the rigid so they still require and , no doubt it is stronger

 

[don_resqcapt19]

I still don't understand why PVC isn't used. Rigid gives a parallel neutral so it would seem like it is better to have pvc. I guess there have never been bad effects from the rigid so they still require and , no doubt it is stronger

There are any number of parallel paths for the grounded conductor current on the line side of the service disconnect. I don't see the path created by the use of metallic service raceways as an issue. I have seen issues with the code required parallel path via the TV cable shield and via metal underground water piping systems.

In my opinion. PVC has two uses. Where there are very serve corrosive conditions or underground. I have never seen an exposed PVC installation that looked good after a year or two. Even with supports as required by the code, it sags.

In this area, the local codes only permit rigid for service conductors.