Picture of safety and service earthing
Picture of safety and service earthing
(OP)
Hello,
I have put a picture for a small installation on the following address:
http://lndang2.tripod.com/
This picture shows that the neutral bar of the transformer is connected to earth bar, and separately, the neutral of the generator is connected to earth.
Only the earth of the transformer is passed on to the ATS.
The reason is: in case both earths (from the generator and from the transformer) are passed to the ATS, then suppose i am working on normal power from the transformer, in this case i will have electricity flowing into the generator through the unintterrupted earthing line, and consequentlyt putting its (dead) neutral point at the same voltage as the neutral of the transformer which can (?)electrify the generator?
When i run from the generator, the earthing of the neutral and the earthing of the earthing bar in the ATS are not the same.
Is the picture correct or does it have something dangerously wrong?
I have put a picture for a small installation on the following address:
http://lndang2.tripod.com/
This picture shows that the neutral bar of the transformer is connected to earth bar, and separately, the neutral of the generator is connected to earth.
Only the earth of the transformer is passed on to the ATS.
The reason is: in case both earths (from the generator and from the transformer) are passed to the ATS, then suppose i am working on normal power from the transformer, in this case i will have electricity flowing into the generator through the unintterrupted earthing line, and consequentlyt putting its (dead) neutral point at the same voltage as the neutral of the transformer which can (?)electrify the generator?
When i run from the generator, the earthing of the neutral and the earthing of the earthing bar in the ATS are not the same.
Is the picture correct or does it have something dangerously wrong?






RE: Picture of safety and service earthing
RE: Picture of safety and service earthing
In case it is still ok and nothing happens to the operator, is the scheme in the picture litterally wrong (separate earths for each source) or it can work?
RE: Picture of safety and service earthing
If you don't connect the grounds, your service technician will be exposed to one "earth" on the generator frame and a different "earth" in the surrounding electrical system. Those different earth potentials could be enough to cause serious harm. That's why the NEC and other electrical codes require all ground systems to be bonded.
RE: Picture of safety and service earthing
There are at least two acceptable options.
1> Run ground cables from the generator to the ATS and/or the MDB. The neutrals should be switched. Only one connection should be used between ground and neutral at one time.
2> Move the connection between neutral and ground to the ATS or to the MDB. (Remove the neutral/ground jumper from the transformer.) With this scheme the neutrals do not have to be switched.
These recommendations are for a normal installation.
There may be exceptions for installations where very large distances separate the transformer, generator and ATS.
Danger from "Hot" neutrals is not usually present. There are exceptions, and incorrectly connected grounds may at times make an installation more dangerous rather than safer.
respectfully