63 amp socket Table 41.1

[Cookie]

Does anyone know why 0.4 seconds was extended to 63 amp socket circuits? Is this because supply sources are getting stronger?

 

[DPG]

I think they are trying to bring protection for 63A sockets in line with the requirements for socket outlets of lower current ratings. Same with the RCD requirements changing.

Unless there's another reason anyone else is aware of.

 

[Cookie]

Guess so, but I can't see the danger being more or less for a fixed 63 amp device vs one on a plug.

 

[Julie.]

Guess so, but I can't see the danger being more or less for a fixed 63 amp device vs one on a plug.

Danger is more for plugged devices due to the flex used.

Fixed loads are usually installed via flexi conduit, armoured cable or similar heavy duty cables.

Plugged in devices usually end up with fairly unprotected trailing leads.

 

[Rockingit]

In my world there's lots of things that are a final circuit (device) on a 63A ceeform, both 1ph and 3ph, so in that sense it makes, er, sense. But then that exact same cable can plug into and power a submain (rubber box distro's) and become a 5s circuit, so it's all about having a thought-through approach.

 

[Cookie]

Danger is more for plugged devices due to the flex used.

Fixed loads are usually installed via flexi conduit, armoured cable or similar heavy duty cables.

Plugged in devices usually end up with fairly unprotected trailing leads.

I guess that means added impedance increasing disconnection times?

 

[i=p/u]

Final circuit or dis circuit is the question.

 

[Julie.]

I guess that means added impedance increasing disconnection times?

No,

Likelihood of damage to cables.

Rcd are for the protection of persons, not equipment.

Trailing leads, associated generally with plugged in equipment tend to get damaged exposing cores, or potential short circuits.

An example may be a 63A welding set, loads of steel plate being moved around, and potential for dropping plate sharp edge-on to the welder supply cable.

Fixed equipment tends not to be like this.

 

[Julie.]

Final circuit or dis circuit is the question.

Socket outlet is a final circuit.

 

[Rockingit]

Socket outlet is a final circuit.

...except when it's plugged into a distribution board