Cnc machine bonding to structural steelwork

[Carl S]

It's the main building structure but it's a 100yr old mill and the space is rented so it's a who is going to pay for it situation. Not good but fairly typical I find.

The incoming is tns. The main transformer / substation is in the building and is the best place imho to bond the structural framework to as there are several boards throughout the building in different units.

Who’s going to pay when there’s a dust explosion and someone is killed?


There’s more to this than BS7671 compliance.

 

[Darkwood]

Ah I'm with it now, well it depends on the contract with the landlord, in all honesty this issue should have been addressed with any electrical work that has been carried out in the building long before this machine arrived, it would seem the suppliers of the machine are just covering their arse here by noting it but its down to who ever installs the supply to note the need for the bonding and include it in the installation costs of the supply cable, whether this an be reclaimed from the landlord is down to the contract the tenent has with them.

Regarding the structural, are they old cast iron rises holding up the wooden roofing frame thus no actual continuity above ground between them?

 

[mort2376]

They are all connected by central beams ( metal ) running length of building. I have as usual inherited this job as they were struggling to find an electrician ( can see why now ) Am thinking of saying you need an eicr carrying out as I think there will be far more problems when you dig down a little. This could've be a walk away job for me as potentially far more problems and hassle than I want to deal with !

 

[Darkwood]

As the machine will have a negative effect on production while it's not running, I would in your position be liasing with your customer for a quick solution and not to be seen as spanner in the works here, I would in your shoes, approach them with your concerns and a price for you to rectify it while expressing you don't want to see this drawn into a --- for tat regarding whose paying as the machine will not be producing anything and will cost more in the long run.. I'm sure they will see your keen approach to get this machine up and running as a positive and probably just tell you to do what is needed - let them worry about reclaiming anything of the landlord here if their contract implies they can

 

[Pat H]

You can also reiterate that the install you have done hasn't reduced the safety of the current non compliant installation as required by the regs. Its however not as safe as current regs would require.

 

[Darkwood]

You can also reiterate that the install you have done hasn't reduced the safety of the current non compliant installation as required by the regs. Its however not as safe as current regs would require.

That would only apply if the structural steelwork aleady had bonding if required but it didn't meet say current sizing of bonding conductor due to changing regulations, where the bonding is absent but is required then no work can be done and signed off until the bonding is installed.