Fitting an isolator between meter and consumer unit.

[SUNRAY]

No.




It does.

That's passed me by, when did that change?

It's all you'll get if a meter fitter adds it.

 

[morqthana]

That's passed me by, when did that change?

Whenever the regulation requiring non-flammable CUs came in.

It's all you'll get if a meter fitter adds it.

If it's the DNOs property they are not bound by the wiring regs, AIUI.

 

[pcaouolte]

When did an isolation switch become a CU?

 

[Collectors]

When you get the new fuse board & if there is room, ask for a board fitted with RCBO's & at least 2 spare fuse ways for any later date.

 

[SUNRAY]

Whenever the regulation requiring non-flammable CUs came in.




If it's the DNOs property they are not bound by the wiring regs, AIUI.

The DNO's property has to conform to a selection of regulations, that's legally conform, in fact they are legally obliged to conform with aspects of BS7671 regs (although not in every respect) whereas what happens after their property there is no legal obligation to conform. An isolator switch is not a CU (nor is it a CU if a distribution board has no main switch), the non flammable regulation you so accurately refer to, IE:

Whenever the regulation requiring non-flammable CUs came in...

Does not in any way refer to any other product than a consumer unit. and an isolator switch on it's own can not in anyway be considered to be a consumer unit.



Changes to the regulations and the definitions therein can be made in the future but for now the above stands unless you have any documentation to the contrary.

 

[morqthana]

Does not in any way refer to any other product than a consumer unit.

and similar switchgear assemblies.

I'd say that a 2P isolator just like the one used as a main switch in a CU was a similar item of switchgear.

 

[flameport]

An isolator in an enclosure is not a consumer unit, distribution board or switchgear assembly as defined in BS EN 61439-3, as there are no protective devices in it, and a single device cannot be used for the distribution of electrical energy.

 

[SUNRAY]

An isolator in an enclosure is not a consumer unit, distribution board or switchgear assembly as defined in BS EN 61439-3, as there are no protective devices in it, and a single device cannot be used for the distribution of electrical energy.


View attachment 419339

Thank you

 

[morqthana]

An isolator in an enclosure is not a consumer unit, distribution board or switchgear assembly as defined in BS EN 61439-3, as there are no protective devices in it, and a single device cannot be used for the distribution of electrical energy.


View attachment 419339

1) How do we know that BS7671 is using the definitions in BS EN 61439-3 when it talks about "similar switchgear assemblies"?

2) The text you quoted does not contain the word 'switchgear'.

3) The BS EN 61439-3 definition of 'DBO' does not preclude it having other definitions of other terms elsewhere.

4) BS7671 defines "switchgear" as "An assembly of main and auxiliary switching equipment for operation, regulation, protection or other control of an electrical installation."

The "or" means that "protection" is not a required characteristic. Basic English grammar 101 - replace the commas with 'or' or 'and' according to the explicit conjunction.

Switchgear. An assembly of main and auxiliary switching equipment for operation or regulation or protection or other control of an electrical installation.


Now tell me that an isolator after the meter is not involved in the operation or control of an electrical installation.

 

[morqthana]

Thank you

Maybe brush up on your language skills.

 

[flameport]

1) How do we know that BS7671 is using the definitions in BS EN 61439-3 when it talks about "similar switchgear assemblies"?

421.1.201 states so.
Within domestic (household) premises, consumer units and similar switchgear assemblies shall comply with BS EN 61439-3

I will not be arguing about the rest. You can interpret, twist and contrive whatever meanings you want.