Sparkingchip:
Okay. I went and had a shower and stood there thinking about this (I know that is not a pretty image, but remember Archimedes had his eureka moment soaking in the bath.).
I can knock the idea that you cannot use a SCRD such as those made by BG as an isolator on the head.
Here is one I have fetched in from my van lying on top of table J1 in the IET Onsite Guide giving guidance on the selection of protective, isolation and switching devices, reproduced from BS7671.
The BG SCRD connection unit is complies with both BS7288:1990 and BS1363-4:1995
Although BS8277 does not approve it as an isolator BS1363-4 does.
If push comes to shove you can take the fuse out of it.
Andy Betteridge
NOTE 4 For SRCDs intended to provide isolation or fault protection, or to be used in IT systems, BS EN 61008-1 or BS EN 61009-1 should be used, as applicable, in conjunction with the requirements of BS 1363-2 for socket-outlets.
It's also worth noting that the 1990 version of BS 7288 had requirements for 3 mm isolation, the 2016 version of the standard does not.
Hence, as I said, guidance will need to change, and BS 7671:2018 is correct to not include BS 7288 in the list of acceptable RCDs.
Sparkingchip:
Okay. I went and had a shower and stood there thinking about this (I know that is not a pretty image, but remember Archimedes had his eureka moment soaking in the bath.).
I can knock the idea that you cannot use a SCRD such as those made by BG as an isolator on the head.
Here is one I have fetched in from my van lying on top of table J1 in the IET Onsite Guide giving guidance on the selection of protective, isolation and switching devices, reproduced from BS7671.
The BG SCRD connection unit is complies with both BS7288:1990 and BS1363-4:1995
Although BS8277 does not approve it as an isolator BS1363-4 does.
If push comes to shove you can take the fuse out of it.
Andy Betteridge
NOTE 4 For SRCDs intended to provide isolation or fault protection, or to be used in IT systems, BS EN 61008-1 or BS EN 61009-1 should be used, as applicable, in conjunction with the requirements of BS 1363-2 for socket-outlets.
It's also worth noting that the 1990 version of BS 7288 had requirements for 3 mm isolation, the 2016 version of the standard does not.
Hence, as I said, guidance will need to change, and BS 7671:2018 is correct to not include BS 7288 in the list of acceptable RCDs.
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