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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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    Doing a little more research, as long as the concrete rebar is not exposed it does not need bonding unless the floor/slab is discovered to be less the 50kOhms, or the exposed rebar falls in the previously stated.  Then it becomes an extraneous conductive part which would need bonding to the main earth bar.

    BSEN7671 [418.1.5]



    I suspect a little confusion here. BS (not EN) 7671 regulation 418.1.5 only applies to installations where the means of protection from electric shock is a non-conducting location. That's an extremely unusual approach for modern installation - where it's much more usual for the chosen protective measure to be ADS (section 411) or Double/reinforced insulation (412) (or a combination of the two).

       - Andy.
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  • 0

    Doing a little more research, as long as the concrete rebar is not exposed it does not need bonding unless the floor/slab is discovered to be less the 50kOhms, or the exposed rebar falls in the previously stated.  Then it becomes an extraneous conductive part which would need bonding to the main earth bar.

    BSEN7671 [418.1.5]



    I suspect a little confusion here. BS (not EN) 7671 regulation 418.1.5 only applies to installations where the means of protection from electric shock is a non-conducting location. That's an extremely unusual approach for modern installation - where it's much more usual for the chosen protective measure to be ADS (section 411) or Double/reinforced insulation (412) (or a combination of the two).

       - Andy.
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