16 amp commando sockets. 20 amp mcb on site guide as maximum value mcb

[David Rann]

16 amp commando and the osg.

 

[Simlec]

lol, I was expecting to see lots of pic's online of earth rod explosions and like but nothing yet (that I have seen) but I feel its coming.

 

[David Rann]

lol, I was expecting to see lots of pic's online of earth rod explosions and like but nothing yet (that I have seen) but I feel its coming.

I need to make sure my public liability covers it!

 

[davesparks]

Because it's an ev charger and like I said in the original post charges for 16 amps constant. Over time I have had them wear the bi metallic strip and start to trip. 20 amps takes the stress off and complies with IET on site guide.

This suggests it is either a poor choice of MCB or actually pulling more than 16A.

A single 16A socket shouldn't need to have an ocpd of more than 16A supplying it, if it does then it is most likely overloaded.

 

[David Rann]

This suggests it is either a poor choice of MCB or actually pulling more than 16A.

A single 16A socket shouldn't need to have an ocpd of more than 16A supplying it, if it does then it is most likely overloaded.

Would you C2 it though?

 

[Ian1981]

Stick a clamp meter on the circuit to see how many amps it's pulling

 

[David Rann]

No point...this is about someone coding a c2 contradicting the IET

 

[Ian1981]

delete

 

[Simlec]

What does he need to clamp it for? He has designed it correctly and no parts are in danger .
No code and I don’t see how you can code it.

 

[Deleted account]

An EICR is only to test and inspect the electrical installation. Not the equipment/ appliances plugged into it. If an appliance is over loading the 16a commando socket then that is an issue with the appliance, not the installation.

 

[Ian1981]

The clamp meter was out of interest but thanks for clearing up the scope of what an eicr covers because really I had no clue!

 

[David Rann]

An eicr is a report on the condition of an installation. It's your opinions backed up by regulations. If you C1 or C2 it then you have to have a reg number to back it up. You can't just go in and say in my opinion....

 

[Ian1981]

You do not need to state the regulation number on a eicr but yes the code does have to relate to something meaningful in the regulations that gives rise to possible danger and safety issues of the existing installation

 

[David Rann]

You do not need to state the regulation number on a eicr but yes the code does have to relate to something meaningful in the regulations that gives rise to possible danger and safety issues of the existing installation

Yes you don't need to write the reg next to it but if somebody questions it you need to be able to back it up.

 

[Ian1981]

It would seam he has fallen into the trap of Ib<In<Iz which is really only applicable if overload is a factor.
As this is a fixed load then he can't code it based on this alone.

 

[telectrix]

It would seam he has fallen into the trap of Ib<In<Iz which is really only applicable if overload is a factor.
As this is a fixed load then he can't code it based on this alone.

but Iz is the current capacity of the cable, not related to the socket.

 

[David Rann]

Exactly 433.3.1 (ii) since the car can pull no more than 16amps then overload protection need not apply only fault protection.

 

[Ian1981]

but Iz is the current capacity of the cable, not related to the socket.

Yeah but perhaps he's thinking of the flex that plugs into the socket if it's only 1.5mm2
Just trying to understand why it's coded
Nothing to do with the fixed wiring but it's maybes why?

 

[telectrix]

the flex on an appliance does not come within the remit of BS7671.

 

[Wilko]

From afar, I feel I would not have coded it at all. Can it be less than safe, given it's the OSG advice on p184 ?
Good discussion of design