Portable generator grounding

[guschash]

Would the generator be consider grounded from if you use a four wire twist 30A plug from the generator to your panel or would you still have to ground the generator to your ground rod?

gus

 

[raider1]

Check out 250.34 for the grounding requirements of portable generators.

Chris

 

[guschash]

Does 250.34 still apply if I am backfeeding my panel.

gus

 

[Pokesomi]

yes. Check 250.34 (A)(1) and (B)(2)

Since you are supplying a backfeed to your panel it must be grounded.

250.34 Portable and Vehicle-Mounted Generators.

(A) Portable Generators. The frame of a portable generator
shall not be required to be connected to a grounding
electrode as defined in 250.52 for a system supplied by the
generator under the following conditions:

(1) The generator supplies only equipment mounted on the
generator, cord-and-plug-connected equipment through
receptacles mounted on the generator, or both

(B) Vehicle-Mounted Generators. The frame of a vehicle
shall not be required to be connected to a grounding
electrode as defined in 250.52 for a system supplied by a
generator located on this vehicle under the following
conditions:

(2) The generator supplies only equipment located on the
vehicle or cord-and-plug-connected equipment through
receptacles mounted on the vehicle, or both equipment
located on the vehicle and cord-and-plug-connected
equipment through receptacles mounted on the vehicle
or on the generator,

 

[suemarkp]

But wouldn't the 4th wire in the cord (EGC) connect you to the building ground electrode system, thereby grounding that generator?

 

[ceb58]

http://forums.mikeholt.com/showthread.php/130061-Portable-Genny-used-as-SDS
This is something that has been discussed before. I think the consensus was that there was not a requirement for a G. rod at the generator in a setup like this. But There would be the requirement for the ground - neutral to be seperated in the generator. Also look at 250.20 D and FPN1