D
dg2908
I've been asked to put a dozen bulkhead lights in some farm buildings. The board (IP65, TT, all RCBOs) and switches (IP65) are in an adjacent storage building (no livestock). I'm planning the lights to be polycarbonate fittings, all fixed to structural timbers and wired using singles in rodent-proof flexible conduit. All of the wiring in the cattle sheds will be 3-4m from the ground. The cattle sheds are Steel portal frame construction with timber beams between the steel frames.
My queries are regarding bonding - main bonding to every portal frame within the buildings (about 20) will be a substantially bigger job than installing the lighting. Given that the lighting will be at one end of the sheds, is there a need to bond it all? Supplementary bonding seems to be required to absolutely everything in cattle sheds (Section 705) because cattle are more susceptible to shock due to the distance between their legs. This would be very tricky as the fixed steel rails between the stalls were concreted in about 40 years ago. Is the fact the conduit and fittings are a minimum of 3m from the ground and not fixed to metal enough to negate the bonding or do I need to use a different solution? I did wonder about using 110V lighting but it seems this isn't much better.
All suggestions gratefully received! As you can tell this job is outside of my usual repertoire- the farm in question is owned by my family and they have promised tenants lighting before the summer is out.
My queries are regarding bonding - main bonding to every portal frame within the buildings (about 20) will be a substantially bigger job than installing the lighting. Given that the lighting will be at one end of the sheds, is there a need to bond it all? Supplementary bonding seems to be required to absolutely everything in cattle sheds (Section 705) because cattle are more susceptible to shock due to the distance between their legs. This would be very tricky as the fixed steel rails between the stalls were concreted in about 40 years ago. Is the fact the conduit and fittings are a minimum of 3m from the ground and not fixed to metal enough to negate the bonding or do I need to use a different solution? I did wonder about using 110V lighting but it seems this isn't much better.
All suggestions gratefully received! As you can tell this job is outside of my usual repertoire- the farm in question is owned by my family and they have promised tenants lighting before the summer is out.
