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Bonding concrete rebar do you need too?

SW1
We have a new building containing 3 machines that wash / clean food in the early stage of a process all equipment is stainless steel.

The building is steel frame, there is an incoming 3phase distribution my question is do you need to earth the concrete slab rebar, also there appears to be no lightning rods to bond the building is this mandatory?

And do you need to bond the concrete rebar to the main earth bar for this installation?


Any guidance greatly appreciated 7671 is not clear on this with respect to the rebar?
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    If it is already there, and you can do a Ze test on the building and separate the effects of any earthing via the mains supply, to not need electrodes for augmenting for LPS I'd want to see less than 10 ohms for a shed size building down to less than an ohm for aircraft hanger sized.

    This is based on expecting about 10 ohms an electrode and an array electrodes a no more than 10m apart if you were looking at adding LPS to an insulated building. Not a hard and fast rule, more of an investigation threshold.
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  • 0
    If it is already there, and you can do a Ze test on the building and separate the effects of any earthing via the mains supply, to not need electrodes for augmenting for LPS I'd want to see less than 10 ohms for a shed size building down to less than an ohm for aircraft hanger sized.

    This is based on expecting about 10 ohms an electrode and an array electrodes a no more than 10m apart if you were looking at adding LPS to an insulated building. Not a hard and fast rule, more of an investigation threshold.
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