2.5mm on a 32a radial or not?

[sam400]

Hi I recently ripped out a ring final circuit out of an old Proteus 3ph board. Customer only wanted a single 2G socket replaced. The MCBs are obsolete so I had to re use the C32 used originally supplied the ring.
can I use 2.5mm cable?
32A radial but with 2.5mm cable- not something you would see in appendix 15, but then thats only a guide and I ve only got one socket on the end, so does 433.3.1 ii apply?
Also no different to spurring off a ring?

This is just for discussion's sake as I ended up putting 4mm in, incase it was added too at a later date.

just interested to see what other thought?

 

[HandySparks]

On a recent EICR I found one double socket on a 2.5mm² radial protected by a B32 MCB.

I didn't code it.

 

[amlu]

in theory 27 amps is max what clipped direct 2.5 can take...
13A maximum load with single socket, 26A with double socket connected.

 

[gnselectricals]

in theory 27 amps is max what clipped direct 2.5 can take...
13A maximum load with single socket, 26A with double socket connected.

Don't think that there's a double socket on the market rates at 26a only 20a as far as I know ?
I wouldn't code it on a periodic but would make a note of it to cover my ---

 

[amlu]

Don't think that there's a double socket on the market rates at 26a only 20a as far as I know ?
I wouldn't code it on a periodic but would make a note of it to cover my ---

With two plugs connected, each fitted with 13A fuse?

 

[gnselectricals]

Doesn't make socket rated at 26a tho mate

 

[snowhead]

Doesn't make socket rated at 26a tho mate

What he's trying to say is the max current (without there being a fault) likely to be on the cable with only a double 13amp socket is 26amp,, below the cable rating.

 

[gnselectricals]

What he's trying to say is the max current (without there being a fault) likely to be on the cable with only a double 13amp socket is 26amp,, below the cable rating.

Fair enough, but that situation should never technically arise as a double socket is not rated to carry 26a for any period of time whether people use it for that purpose or not so in my opinion the OP's situation is fine technically as there is no risk of overloading the cable anyway. Although I would never install to this method

 

[jase]

Hi I recently ripped out a ring final circuit out of an old Proteus 3ph board. Customer only wanted a single 2G socket replaced.

What do you do for an encore?

 

[sam400]

What do you do for an encore?

Eh? Don't follow?

 

[Pete999]

Eh? Don't follow?

You said the customer "only wanted a twin socket changed" yet you ripped out a RFC from the CU? I think that's what he is trying to say.

 

[DPG]

Yeah, I was also confused by the opening line of the original post! Daz

 

[richy3333]

Hi I recently ripped out a ring final circuit out of an old Proteus 3ph board. Customer only wanted a single 2G socket replaced. The MCBs are obsolete so I had to re use the C32 used originally supplied the ring.
can I use 2.5mm cable?
32A radial but with 2.5mm cable- not something you would see in appendix 15, but then thats only a guide and I ve only got one socket on the end, so does 433.3.1 ii apply?
Also no different to spurring off a ring?

This is just for discussion's sake as I ended up putting 4mm in, incase it was added too at a later date.

just interested to see what other thought?

proteus are a UK company. Did you check that you couldn't get a £5 MCB?

 

[Deleted member 26818]

Don't think that there's a double socket on the market rates at 26a only 20a as far as I know ?
I wouldn't code it on a periodic but would make a note of it to cover my ---

MK Logic and Logic Plus double sockets are rated at 26A.
BS1361 requires a minimum rating of 20A, though many exceed this.

 

[7029 dave]

I can not get my head round that op, why rip out RFC for radial.?

 

[SJD]

I'm curious too as to what happened to the ring final circuit? Hopefully it wasn't needed for anything!
On the RFC, you are allowed a spur at the origin, and thus keep the ring.

 

[7029 dave]

I'm curious too as to what happened to the ring final circuit? Hopefully it wasn't needed for anything!
On the RFC, you are allowed a spur at the origin, and thus keep the ring.

Yes indeed.

 

[sam400]

You said the customer "only wanted a twin socket changed" yet you ripped out a RFC from the CU? I think that's what he is trying to say.

Apologies I didn't explain that very well, the builders on site ripped all the existing conduit out and with it the existing ring final, leaving it broken on the floor and live, so I dissed it all and put it in the skip, customer just needed one 2g putting back.

Thanks for the replies, I think despite the rating of the socket you should allow for 26A maximum, as you could in theory plug 2 x 3kw loads into it. The 2.5 cable would have been sufficient I feel and is protected from overload by the plug top fuses.

No I didn't look into getting a £5 MCB - my regular wholesaler does not stock proteus 3871 MCBs i dunno whats up with them??