This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Smart relays on ring mains

Hi, 

I have installed plenty of these devices, as well as their dimmer range. 

https://shelly.cloud/products/shelly-1pm-smart-home-automation-relay/

What I am seeing however, is a number of people within online forums, installing these smart relays on ring mains. What they are doing is spurring from a ring, in 2.5mm and then switching this spur with the relay (without any form of fusing down, via means of an FCU). 

I do not believe this is compliant, for the following reason: 

  • The relay is rated at 16A, and although it has overload protection, this is electronic and if the contact welds, the overload would not be broken by the relay itself.

If installed after a 13A fused connection unit, the device is not only protected by a 13A fuse (less than the contact rating) it is also then seen as some sort of appliance. 

Is there anything else to add to this? 

Would anyone here actually install these relays in-line with a ring main and if so, why/how does this comply with BS7671? 

A few people have stated that the likes of Click Smart have a similar setup in a double socket: 

https://click-smart.com/products/mode-smart-sockets

However these are covered by a product standard and not BS7671, so the application is very different. 

Thoughts? 

Parents
  • A customer had a rant at me, because I installed double pole switches upfront of the Smart switches he had bought for his immersion heaters, I explained they were there for safety to allow plumbers and electricians to work on his hot water tank and immersion heaters safely and refused to remove them, despite him saying they were not required and he didn’t want them.

    Bear in mind all of these switches are out of sight in his airing cupboard and I had to run two supplies through off-peak smart switches to get it to work, making it clear to anyone working on it in future what I had done.

Reply
  • A customer had a rant at me, because I installed double pole switches upfront of the Smart switches he had bought for his immersion heaters, I explained they were there for safety to allow plumbers and electricians to work on his hot water tank and immersion heaters safely and refused to remove them, despite him saying they were not required and he didn’t want them.

    Bear in mind all of these switches are out of sight in his airing cupboard and I had to run two supplies through off-peak smart switches to get it to work, making it clear to anyone working on it in future what I had done.

Children
No Data