night tariff meter change to standard tariff

[westward10]

I totally disagree with this for a domestic installation, can they confirm where in BS7671 this is noted. I suspect they are implying that by doing this you are creating two installations each of which having a single point of isolation making Reg 537.1.4 a farce.

 

[snowhead]

As the installation is now and any other with split off peak, there is no single point of isolation other than the 2 C.Us being adjacent to each other.

 

[westward10]

Use a four pole isolator.

 

[Deleted member 26818]

As the installation is now and any other with split off peak, there is no single point of isolation other than the 2 C.Us being adjacent to each other.

Two installations.
The origin of an installation is and always has been, the customer connection point (usually at the meter).
With split tariffs there is either two meters, each supplying a separate installation or a single meter with two connection points, with each connection point supplying a separate installation.
BS7671 allows for more than one installation in a building.

The NICEIC (despite the fact that the respondent is a member of the IET), loves to make up their own regulations or make their own interpretation.

 

[Colin188]

I totally disagree with this for a domestic installation, can they confirm where in BS7671 this is noted. I suspect they are implying that by doing this you are creating two installations each of which having a single point of isolation making Reg 537.1.4 a farce.

I would assume that the double pole switch disconnections in each consumer unit would satisfy this as both consumer units are next to each other.

 

[westward10]

I would assume that the double pole switch disconnections in each consumer unit would satisfy this as both consumer units are next to each other.

I disagree but that aside how will you provide additional rcd protection.

 

[Deleted member 26818]

I would assume that the double pole switch disconnections in each consumer unit would satisfy this as both consumer units are next to each other.

No.
They comply at present because they are two separate installations, both controlled by a single point of isolation.

 

[Deleted member 26818]

The purpose of the single point of isolation, is so in the event of an emergency, the installation can be switched off easily.

 

[Colin188]

The purpose of the single point of isolation, is so in the event of an emergency, the installation can be switched off easily.

So with correct warning identification on each consumer unit this would meet requirements. If one cu was a shower cu then mark as shower, if next was garage cu then mark as garage, and the final cu would be marked main distribution i.e sockets/lighting making correct for emergency/maintenace isolation for the domestic consumer.

 

[Deleted member 26818]

That would be for you to decide.
In the event of a fire with smoke billowing around, would what you suggest be easy for a fire fighter who doesn't know the property, to isolate?

 

[mattg4321]

Having to switch off at 2 consumer units rather than 1 would be the least of my worries were I said firefighter.

The amount of s*** most people keep in the way of getting to the consumer unit(s) would be worry numero uno.

If firefighters in this situation were of such importance surely regulations should specify that where possible (certainly in new builds) DP isolation to be provided at external meter box.

 

[Colin188]

Having to switch off at 2 consumer units rather than 1 would be the least of my worries were I said firefighter.

The amount of s*** most people keep in the way of getting to the consumer unit(s) would be worry numero uno.

If firefighters in this situation were of such importance surely regulations should specify that where possible (certainly in new builds) DP isolation to be provided at external meter box.

Totally agree . Lets have a Red firemans switch external to each property to overcome this worry. Could be in the 18th edition! Would have solved all this

 

[Deleted member 26818]

Strangely enough, the requirement for a fireman's switch has been discussed.
At present existing devices do not have a sufficiently high enough rating for the majority of installations.
Then there are further considerations.
Can it be tamper proof, can it be installed so as to isolate p.v. systems, how would it work with UPS systems, should it be installed as part of the distributer's equipment, what about buildings with multiple supplies, etc?