400 amp service grounding and bonding

[electric man 31]

Hi to all!!
I am looking for some help in grounding and bonding a service I am doing.The service in question is a 400 amp 3 phase 4 wire overhead service 120/208volts. My question is where do I tie my grounds into? I am driving 2 ground rods and bonding building steel, also Iam going to hit the main water pipe upon entering the building. I have a main switch with a c.t. cabinet from there I have a main dist. panel that in turn feeds two 200 amp panels. My mainswitch only has one lug in it which says for equiptment grounding elecdrode only, so do I land my driven ground there? If this is correct then do I land my water ground and building steel grounds in the main dist. panel with my sub panel grounds?As you can see I am a little confused on what goes where in this type of application! How about bonding bushings?? where should they go and at what point do I tie them to? Any help in this matter would do me good thanks to all who respond!!!!

 

[tom baker]

Re: 400 amp service grounding and bonding

Hmm, can you take a fellow electricain out for coffee to get some answers?
The grounding electrode conductor can terminate anywhere from the load end of the service drop up to and including the grounded service disconnect enclosure. The Grounding electrode conductor (the code does not use the term ground)is normally terminated in the service disconnect enclosure to a buss bar with the neutral (OK sorry grounded conductor)where the main bonding jumper is installed.
If you've got two service disconnects then you bond in each.
Bonding bushings are only required on metal raceways enclosing unfused service entrance conductors. The bonding jumper goes the buss bar mentioned above.

If the buss bar does not have enough termination lugs then check the mfg catalog for an accessory kit, some times called a solid neutral kit.