63 amp socket Table 41.1

Cookie · Mar 24, 2021

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

[ElectriciansForums.net] 63 amp socket Table 41.1

DPG · Mar 25, 2021

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 · Mar 25, 2021

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. · Mar 25, 2021

Cookie said:
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 · Mar 25, 2021

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 · Mar 26, 2021

Julie. said:
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 · Mar 26, 2021

Final circuit or dis circuit is the question.

Julie. · Mar 26, 2021

Cookie said:
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. · Mar 26, 2021

i=p/u said:
Final circuit or dis circuit is the question.

Socket outlet is a final circuit.

Rockingit · Mar 26, 2021

Julie. said:
Socket outlet is a final circuit.

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

pc1966 · Mar 26, 2021

Rockingit said:
...except when it's plugged into a distribution board

Wow! "Have DB, will travel"

Rockingit · Mar 26, 2021

Pretty much!

Cookie · Mar 26, 2021

Julie. said:
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.

To me that would mandate RCDs instead of reduced disconnection, but what do I know? ?

Julie. · Mar 26, 2021

Cookie said:
To me that would mandate RCDs instead of reduced disconnection, but what do I know? ?

See post 2

Both aspects are being brought in line.

Cookie · Mar 26, 2021

Julie. said:
See post 2

Both aspects are being brought in line.

Alright.

So double checking that would mean a hard wired cooker could get away with 5 seconds, but a flex cooker would require 0.4 seconds? In the US almost all cookers have plugs on them.

63 amp socket Table 41.1

Cookie

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DPG

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Cookie

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Julie.

Rockingit

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Cookie

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i=p/u

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Julie.

Julie.

Rockingit

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pc1966

Rockingit

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Cookie

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Julie.

Cookie

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