87GTA
Member
- Messages
- 17
Hi Folks,
been a member of this excellent forum since the beginning of the year and have learned a lot from it in that short time, this is my first post as so far I have always found the answers I needed somewhere in the forum but although I found quite a lot of info about the garage wiring for a welder I just thought I'd run my plan past the experts before I start.
Ive just built a new workshop at home 28ft x 14ft in place of a standard size garage that was there before and now its time for wiring it up, I know there are few very knowledgeable sparky's on here so any advise would be very welcome.
Firstly a friend of my next door neighbour is a sparky & has agreed to check the installation over after it is installed & will also do any work I dont feel capable of but I should be ok for most of the donkey work & this will hopefully keep the costs to a minimum.
Anyway the original wiring to the old garage was all 2.5 from CU to outside wall then 2.5 SWA underground & into the garage CU, it was only for a couple of sockets and 2 strip lights. This has all been removed and now the plan is to install much beefier cable to be able to use a mig & compressor etc.
Dont know if this is a bit of overkill but plan to use 16mm T&E to run from a spare way in the non RCD side of the house CU to the outside wall (9m max) into a weatherproof box mounted on the outside wall & connected to 16mm SWA (4core but only using 3, got it cheap) to run from outside house wall underground to outside garage wall & into another weatherproof box (8m max), then 16mm T&E into garage CU (1m).
Inside the garage there will be 8 x 4ft flourescent lights, 4 will be fed from a 6mcb & the other 4 fed from a second 6amp mcb on the non rcd side through a double switch or seperate switches. Reason for this is that if something goes wrong with one circuit I dont get plunged into darkness.
Want to put in either 4 or 6 double sockets on a ring from a 32amp mcb on the rcd side of the CU and also 2x 16amp blue sockets fed from two seperate 16amp mcbs on the rcd side using 4mm T&E, these are both for the welders, only one welder will ever be used at a time (Clarke 230TE, Sealey Supermig 195 & Lincoln 210).
One of the 16amp sockets will be approx 1m from the CU the other is approx an 8m cable run
The compressor is 3hp Sealey but this runs off a 13amp plug as its soft start
house & garage CU's are both Crabtree Starbreaker split load with 100amp main & 63amp 30mA RCD
Main thing I want to know is what size MCB do I need to use in the non RCD side of the house CU.
And will the 16amp sockets be enough for the welders mentioned above or would it need to be 32amp & is 4mm T&E ok or should I use 6mm
also all the mcbs being used are B type but if there is a problem later with the ones for the welders I guess I can just change them to C type.
I mainly use the Clarke 230 and its on a 13amp plug just now and has only ever blown the fuse at the higher settings so hoping the 16amp type B will be ok.
Other main power tools in the garage include 1/2HP piller drill, bench grinder (not a big industrial one) Rocket heater (not sure what that draws but can find out) and also the usual hand drills & grinders etc, Im the only one in there so these will never all be getting used at once.
I know all this work has to be notified etc as its going to be a completely new installation but any advise on the planned installation or anything else that it would be worthwhile considering adding would be appreciated.
Sorry for the huge post
Thanks in advance
been a member of this excellent forum since the beginning of the year and have learned a lot from it in that short time, this is my first post as so far I have always found the answers I needed somewhere in the forum but although I found quite a lot of info about the garage wiring for a welder I just thought I'd run my plan past the experts before I start.
Ive just built a new workshop at home 28ft x 14ft in place of a standard size garage that was there before and now its time for wiring it up, I know there are few very knowledgeable sparky's on here so any advise would be very welcome.
Firstly a friend of my next door neighbour is a sparky & has agreed to check the installation over after it is installed & will also do any work I dont feel capable of but I should be ok for most of the donkey work & this will hopefully keep the costs to a minimum.
Anyway the original wiring to the old garage was all 2.5 from CU to outside wall then 2.5 SWA underground & into the garage CU, it was only for a couple of sockets and 2 strip lights. This has all been removed and now the plan is to install much beefier cable to be able to use a mig & compressor etc.
Dont know if this is a bit of overkill but plan to use 16mm T&E to run from a spare way in the non RCD side of the house CU to the outside wall (9m max) into a weatherproof box mounted on the outside wall & connected to 16mm SWA (4core but only using 3, got it cheap) to run from outside house wall underground to outside garage wall & into another weatherproof box (8m max), then 16mm T&E into garage CU (1m).
Inside the garage there will be 8 x 4ft flourescent lights, 4 will be fed from a 6mcb & the other 4 fed from a second 6amp mcb on the non rcd side through a double switch or seperate switches. Reason for this is that if something goes wrong with one circuit I dont get plunged into darkness.
Want to put in either 4 or 6 double sockets on a ring from a 32amp mcb on the rcd side of the CU and also 2x 16amp blue sockets fed from two seperate 16amp mcbs on the rcd side using 4mm T&E, these are both for the welders, only one welder will ever be used at a time (Clarke 230TE, Sealey Supermig 195 & Lincoln 210).
One of the 16amp sockets will be approx 1m from the CU the other is approx an 8m cable run
The compressor is 3hp Sealey but this runs off a 13amp plug as its soft start
house & garage CU's are both Crabtree Starbreaker split load with 100amp main & 63amp 30mA RCD
Main thing I want to know is what size MCB do I need to use in the non RCD side of the house CU.
And will the 16amp sockets be enough for the welders mentioned above or would it need to be 32amp & is 4mm T&E ok or should I use 6mm
also all the mcbs being used are B type but if there is a problem later with the ones for the welders I guess I can just change them to C type.
I mainly use the Clarke 230 and its on a 13amp plug just now and has only ever blown the fuse at the higher settings so hoping the 16amp type B will be ok.
Other main power tools in the garage include 1/2HP piller drill, bench grinder (not a big industrial one) Rocket heater (not sure what that draws but can find out) and also the usual hand drills & grinders etc, Im the only one in there so these will never all be getting used at once.
I know all this work has to be notified etc as its going to be a completely new installation but any advise on the planned installation or anything else that it would be worthwhile considering adding would be appreciated.
Sorry for the huge post
Thanks in advance