Proposal - 6mm T&E clipped direct, 9m from CU protected by 40A MCB supplying an 8.5kW shower.
BC has informed me that table 4D5 shows cable not compliant, but I cannot see how this is the case.
I have it that the design current would be 37A and the CCC of the clipped cable would be 47A from Table 4D5 and 46A from Table 4D2A and my voltage drops are fine.
I cannot see what is wrong with this design?
Still at design stage, so things are flexible at the moment - As a secondary question, the cable will be clipped to joists, by itself, and when it comes down from the above joists, I have created a non-insulated stud wall (the thickness of CLS) away from a concrete wall, and plan to clip the cable to the CLS.
1. Can I still assume that this will still suffice as clipped direct.
Further, I am providing some design documentation to BC for radials - this cable will be clipped to joists from above, but in this instance some of the cable will come down from the ceiling into an insulated stud wall. I plan to also clip this cable to the CLS.
2. As the cable is in an insulated stud wall for some of its run, but clipped for all of it, how would this normally be classified - "In wall, in thermal insulation" or "clipped direct", and if it's a grey area, what method might I adpot to keep the CCC higher, e.g. keeping the thermal insulation away from the cable by nails, ... using more CLS to prevent contact ... as when I get the BC visit, I want to be sure of my position.
Any help would be appreciated.
BC has informed me that table 4D5 shows cable not compliant, but I cannot see how this is the case.
I have it that the design current would be 37A and the CCC of the clipped cable would be 47A from Table 4D5 and 46A from Table 4D2A and my voltage drops are fine.
I cannot see what is wrong with this design?
Still at design stage, so things are flexible at the moment - As a secondary question, the cable will be clipped to joists, by itself, and when it comes down from the above joists, I have created a non-insulated stud wall (the thickness of CLS) away from a concrete wall, and plan to clip the cable to the CLS.
1. Can I still assume that this will still suffice as clipped direct.
Further, I am providing some design documentation to BC for radials - this cable will be clipped to joists from above, but in this instance some of the cable will come down from the ceiling into an insulated stud wall. I plan to also clip this cable to the CLS.
2. As the cable is in an insulated stud wall for some of its run, but clipped for all of it, how would this normally be classified - "In wall, in thermal insulation" or "clipped direct", and if it's a grey area, what method might I adpot to keep the CCC higher, e.g. keeping the thermal insulation away from the cable by nails, ... using more CLS to prevent contact ... as when I get the BC visit, I want to be sure of my position.
Any help would be appreciated.