Using the steel frame of a buildinig for grounding
- Thread starter gjv44736
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Re: Using the steel frame of a buildinig for grounding
Bonding jumpers would be my answer.
Bonding jumpers would be my answer.
Re: Using the steel frame of a buildinig for grounding
If the building steel is effectively grounded, it must be used as part of the grounding electrode system.
If the joints are not electrically credible, the steel is not effectively grounded, and can not be a grounding electrode.
[ May 06, 2003, 02:35 PM: Message edited by: bennie ]
If the building steel is effectively grounded, it must be used as part of the grounding electrode system.
If the joints are not electrically credible, the steel is not effectively grounded, and can not be a grounding electrode.
[ May 06, 2003, 02:35 PM: Message edited by: bennie ]
arneykaner
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Re: Using the steel frame of a buildinig for grounding
I agree with Tom, but also think that if the steel is divided into few separate parts by expansion joints, then each part has to have at least one connection to a driven electrode. I don't think the building steel by itself is sufficient as grounding, there should be driven electrodes anyway. Also, a counterpoise cable, that goes around the structure and has multiple connections to the building steel would be a good thing to do.
I agree with Tom, but also think that if the steel is divided into few separate parts by expansion joints, then each part has to have at least one connection to a driven electrode. I don't think the building steel by itself is sufficient as grounding, there should be driven electrodes anyway. Also, a counterpoise cable, that goes around the structure and has multiple connections to the building steel would be a good thing to do.
Re: Using the steel frame of a buildinig for grounding
Arney, what would driven rods add to the steel as far as overall grounding if any part of the steel were connected to slab, or footer rebar, or the steel column bolts?
Roger
[ May 08, 2003, 06:15 PM: Message edited by: roger ]
Arney, what would driven rods add to the steel as far as overall grounding if any part of the steel were connected to slab, or footer rebar, or the steel column bolts?
Roger
[ May 08, 2003, 06:15 PM: Message edited by: roger ]
Re: Using the steel frame of a buildinig for grounding
Multiple connections to the building steel, without bonding (shorting) all the steel to form a low impedance ground plane, will create current in the ground plane. The voltage drop across the loose joints will be common mode voltage.
Single point ground is to prevent stray facility current from using the ground plane as a current path.
Multiple connections to the building steel, without bonding (shorting) all the steel to form a low impedance ground plane, will create current in the ground plane. The voltage drop across the loose joints will be common mode voltage.
Single point ground is to prevent stray facility current from using the ground plane as a current path.
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