Hi all.
A few years back I helped with putting power into a camp site.
Started small with a 3ph 63A MCB, 25mm² 4C SWA to a hut, from there 3x 32A RCBO & 2C 6mm² SWA to adjacent toilet block and 2 pillars.
It is claimed to be TNC but there is regularly a few volts between N & E. Earth was not exported from the building, 2 earth rods were fitted at each of the 4 locations.
We later added another RCBO to 'the barn', being a timber structure ~4mx6m open on one short side used for a shelter/meeting point/entertainment area.
We have gone back to add another pillar, dug the trench and buried the duct but found a dated note on the 3ph board '25mm earth added from MET' and sure enough a hole has been drilled in the enclosure, paint scrapped off (and rusted) and 25mm² green yellow bent round and fixed with plated steel bolt, washer & nut. All ends of SWA's which had been carefully glanded into insulated plates for isolation have had banjos fitted and bonded to earth bars.
2P MCB's throughout have been replaced with SP RCBO's.
My boss is livid that all that has been done, especially exporting the earth from the building to all locations.
I haven't looked in any books (Then or now) but my understanding is camp sites should be TT and 2P OCPD as we originally fitted. My bosses reaction seems to be the same, he is usually very clued up and has sat on IEE committees in the past.
Am I barking up the wrong tree?
A few years back I helped with putting power into a camp site.
Started small with a 3ph 63A MCB, 25mm² 4C SWA to a hut, from there 3x 32A RCBO & 2C 6mm² SWA to adjacent toilet block and 2 pillars.
It is claimed to be TNC but there is regularly a few volts between N & E. Earth was not exported from the building, 2 earth rods were fitted at each of the 4 locations.
We later added another RCBO to 'the barn', being a timber structure ~4mx6m open on one short side used for a shelter/meeting point/entertainment area.
We have gone back to add another pillar, dug the trench and buried the duct but found a dated note on the 3ph board '25mm earth added from MET' and sure enough a hole has been drilled in the enclosure, paint scrapped off (and rusted) and 25mm² green yellow bent round and fixed with plated steel bolt, washer & nut. All ends of SWA's which had been carefully glanded into insulated plates for isolation have had banjos fitted and bonded to earth bars.
2P MCB's throughout have been replaced with SP RCBO's.
My boss is livid that all that has been done, especially exporting the earth from the building to all locations.
I haven't looked in any books (Then or now) but my understanding is camp sites should be TT and 2P OCPD as we originally fitted. My bosses reaction seems to be the same, he is usually very clued up and has sat on IEE committees in the past.
Am I barking up the wrong tree?
