installing 110v and 240v socket in the same circuit

[Luka]

Hi All
Please advise in regards to wiring my shed/workshop. I need to install 110v plug. At the moment I have only 13A 240v standard sockets. Can I replace one of them with 16A 110v socket and have 240v and 110v sockets in the same radial circuit (please see picture attached)? Is it safe taking that I will not overload the circuit 0r I have to upgrade my consumer unit to have another MCB to run separate 16A circuit only for 110v socket? Also would 2.5mm2 cable will be sufficient or needs upgrade?

 

[Pete999]

Hi All
Please advise in regards to wiring my shed/workshop. I need to install 110v plug. At the moment I have only 13A 240v standard sockets. Can I replace one of them with 16A 110v socket and have 240v and 110v sockets in the same radial circuit (please see picture attached)? Is it safe taking that I will not overload the circuit 0r I have to upgrade my consumer unit to have another MCB to run separate 16A circuit only for 110v socket? Also would 2.5mm2 cable will be sufficient or needs upgrade?

View attachment 45881

In a word NO you can't

 

[chris gray]

Plug a 110v step down transformer into one of the sockets

 

[Luka]

thanks. Is option with adding MCB to feed only 110v socket ok then? this is my CU https://www.screwfix.com/p/british-...FTY9rDQdlErPExO-5JBoC3_0QAvD_BwE&gclsrc=aw.ds

 

[Luka]

Plug a 110v step down transformer into one of the sockets

thanks, I guess it is also good for portability

 

[telectrix]

what load do you expect on the 110V?

 

[Luka]

what load do you expect on the 110V?

band saw ATB single phase 0.45kw motor

 

[Silly Sausage]

Hi All
Please advise in regards to wiring my shed/workshop. I need to install 110v plug. At the moment I have only 13A 240v standard sockets. Can I replace one of them with 16A 110v socket and have 240v and 110v sockets in the same radial circuit (please see picture attached)? Is it safe taking that I will not overload the circuit 0r I have to upgrade my consumer unit to have another MCB to run separate 16A circuit only for 110v socket? Also would 2.5mm2 cable will be sufficient or needs upgrade?

View attachment 45881

You can't have a 32A mcb on a 2.5mm radial, as in your drawing.
Needs to be a 20A.

 

[Luka]

You can't have a 32A mcb on a 2.5mm radial, as in your drawing.
Needs to be a 20A.

fair point, I need to change it at some point. I don't use more power than 3.5kW at once though

 

[telectrix]

what size cable feeds from the house, and what MCB rating?

 

[Luka]

what size cable feeds from the house, and what MCB rating?

its 30a mcb and 2.5mm cable

 

[telectrix]

you're stuffed then @ 3.5kW. that alone is a full load for 2.5mm.. a new cable from house is the only solution. and a 30A MCB is too high a rating for 2.5mm.

 

[Spoon]

Did you do the wiring for the garage?
It looks like the circuit from your house to the garage needs looking at.

 

[Luka]

you're stuffed then @ 3.5kW. that alone is a full load for 2.5mm.. a new cable from house is the only solution. and a 30A MCB is too high a rating for 2.5mm.

I thought that 3.5 kW is about 13.6A, that is using my physics knowledge (P=V x I) but I'm not an electrician so I don't know if it works that way in practice. If it's safe for 2.5mm circuit operate on 20A MCB so 13.6A should not cause the problem. They rate prysmian 2.5mm cable 18.5A so I thought it should be fine. Regarding cable from house maybe it is not 2.5mm then (to be honest that was a guess), it was wired by electrician so I imagine it was done properly (at least I hope so). I won't be able to change cable from the house but I imagine that installing 20A MCB in the shed should give a sufficient barrier

 

[Luka]

Did you do the wiring for the garage?
It looks like the circuit from your house to the garage needs looking at.

It was done by electrician good few years ago so maybe its not 2.5mm, I was guessing, to be honest don't know why