This question concerns a domestic installation and the possible need for an isolator. It is answered by SELECT (Theme – Installation Tips):
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| An isolator if the CU is further than 2m away? |
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This Q & A is one of thousands posted in our Technical Expertise area, and answered on a daily basis by our Voltimum Experts.
Question: In a domestic installation, where the supply meter is located in an external meter box, and the consumer unit is further away than 2m, firstly - is it a mandatory requirement to install an isolator?
Secondly, can the supply authority insist that the isolator is not installed within their meter box?
Answer: Generally, the distributor will allow meter tails to be protected against fault current by their cut-out fuse, providing that the meter tails do not exceed 3m in length.
If the tails do exceed 3m, then you must install a suitable switch-fuse or fuse-switch to provide adequate fault protection. The distributor may not allow you to install this main switch in its meter box. If not, you will need to install the fuse-switch within the 3m length of tails.
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