During an Eicr noticed the remote garage got an up & over metallic door.. the garage got its own CU & relevant RCBO’s… No incoming services only the newly installed Garage Door which is controlled by remote… would you consider a MPBC to it
Discuss MPBC is it required in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
English man, English.consider a MPBC to it
Main Protective Bonding Conductor ..everything’s abbreviated these days…SozEnglish man, English.
Ok… it’s a bit different from normal circumstances, being a possible internal & external situation on fault conditionNo, unless it's likely to introduce a potential.
It’s in contact with the ground & the rollers are metal tooIs it in direct contact with the ground?
Then it needs bonding. By definition of an extraneous conductive part.It’s in contact with the ground & the rollers are metal too
It may not be, though. If the controller / motor unit is class 2 (which I'd wager it is) then it's not an extraneous part. No different to the now infamous crittal window scenario. In fact I'd go so far as to suggest that by bonding it you could be introducing a potential hazard where none previously existed.Then it needs bonding. By definition of an extraneous conductive part.
Agree once again this topic always causes concernIt may not be, though. If the controller / motor unit is class 2 (which I'd wager it is) then it's not an extraneous part. No different to the now infamous crittal window scenario. In fact I'd go so far as to suggest that by bonding it you could be introducing a potential hazard where none previously existed.
A bit of testing would be an idea to ascertain if it is indeed extraneous.Agree once again this topic always causes concern
MPBC if required would mean a TT system, it’s a report @ the moment & FI required
The motor is surely irrelevant, if there is a large lump of metal in contact with the ground (the frame of the roller shutter door) then it's most likely an extraneous conductive part (but would only require bonding if it's simultaneously accessible with any exposed conductive parts). There are other circuits in the CU, which may not be connected at the moment, but most likely will be at some point, probably including sockets.It may not be, though. If the controller / motor unit is class 2 (which I'd wager it is) then it's not an extraneous part
Why?For an EICR, I would suggest it's a C2 if it proves to be an ExtConPt.
By that logic so is a garden gate!! My question remains - how, exactly, do you propose that this door is going to become part of an electrical circuit?The motor is surely irrelevant, if there is a large lump of metal in contact with the ground (the frame of the roller shutter door) then it's most likely an extraneous conductive part (but would only require bonding if it's simultaneously accessible with any exposed conductive parts). There are other circuits in the CU, which may not be connected at the moment, but most likely will be at some point, probably including sockets.
It would be prudent to test it in any case.
For an EICR, I would suggest it's a C2 if it proves to be an ExtConPt.
PME is not prohibited on a building site.Why?
That seems a bit severe unless it is a specific situation (building site, marina, etc) where connection to a PME style of supply is prohibited.
I think that’s an ish at best! So whilst 704.411.3.1 does not specifically prohibit it - outright - it does seriously discourage it, though. My view is that this Reg exists to allow PME supplies to be delivered to sites to get them going (with subsequent ‘normal’ deployment once construction is complete) but with the intent to not use the CNE aspect and make a TT instead. I also assume that as soon as the much discussed change to mandate foundation earthing systems comes into play then this Reg will disappear completely as irrelevant. Maybe. Just my take on it.PME is not prohibited on a building site.
Simultaneously accessible parts can be touched by a person, it’s internally & externally that could be the problem.Seeing industrial Roller Doors obviously these are actually attached to the main Metal Structure of the building which have a MPBC connected to it.By that logic so is a garden gate!! My question remains - how, exactly, do you propose that this door is going to become part of an electrical circuit?
Is the main building a metal structure?Simultaneously accessible parts can be touched by a person, it’s internally & externally that could be the problem.Seeing industrial Roller Doors obviously these are actually attached to the main Metal Structure of the building which have a MPBC connected to it.
Regulation 704.411.3.1 of BS 7671, whichPME is not prohibited on a building site.
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