Electrical Help Needed

[scooby]

Hi
i need some help with a few electrical questions

I want to put a bigger power supply to my garage to run some welding equipment,three phase is out of the question so will have to take power feed directly from property feed,the question is what is the maximum feed i will get and what size cable will i need to make a run of approx 28 metres
garage is at the moment fed by a 20 amp mcb which is feeding a 16 amp fuse in the garage
thanks
Stuart

[NeilB]

I might be wrong but unless you are running bloody big welders 20amp is more than enough.

My hobby 50-250amp ac arc welder only needs a 16amp supply.

[machiavelli]

Most DNOs will supply up to 100A single phase. If you don't know the authorised supply capacity of the installation they should be able to tell you. The cable you need depends on the current, length, acceptable voltage drop and whether it is enclosed or clipped to a surface or cable tray and I'm sure there will be an electrician along shortly with the numbers at their fingertips.

If the garage is seperate from the house you need to consider the protection of the cable run - armoured cable is expensive but would you bury anything else? - and earthing - you may have a PME installation and I think the wiring regs have something to say about exporting the DNO's earth.

[Paul Evans]

Our MMA's at work run from a domestic 13amp socket without any problems.

Circuit at 16 amps. !!

Unless you are building bridge's you should be OK

[deepbull]

stick 10mm2 3core a/c in you will be ok
the rest are talking b*locks

have fun

13a x 230v = 2990w if its 3000w lets hope you have a supply of more than 240v ;}

and the beer has been flowing ;}

[dry suit diver]

Originally Posted by machiavelli

Most DNOs will supply up to 100A single phase. If you don't know the authorised supply capacity of the installation they should be able to tell you. The cable you need depends on the current, length, acceptable voltage drop and whether it is enclosed or clipped to a surface or cable tray and I'm sure there will be an electrician along shortly with the numbers at their fingertips.

If the garage is seperate from the house you need to consider the protection of the cable run - armoured cable is expensive but would you bury anything else? - and earthing - you may have a PME installation and I think the wiring regs have something to say about exporting the DNO's earth.

Originally Posted by deepbull

stick 10mm2 3core a/c in you will be ok
the rest are talking b*locks

have fun

13a x 230v = 2990w if its 3000w lets hope you have a supply of more than 240v ;}

and the beer has been flowing ;}

garage is outside the equipotential zone so will require an earth rod at the Consumer unit you will need to fit inside the garage.( ESQC regs will come into force and the REC are starting to get a bit touchy about the use of the earth they provide, which they are not obligated to supply to your property)

easiest and safest way is get a proper spark in.

next best way henly blocks on the meter tails new tails to a 60A fused switch, 16mmsq 3c SWA to the garage new 4way consumer unit on the end, 32A ring main, 6A lighting circuit, and a 20A radial for the welder if the thing wont plug into the ring main.

Hevacomp and Amtech bothcame up with the same answers and if works bloody firewall would let me paste the screenshots I would.

10mm2 just makes it on the volt drop but fails on the adiabatic equations

minimal voltdrop and proper sze CPC PM me if you need more details or putting into laymans English.


the unsafe way is just run a pice of 1.0mm flex on a 13a plugtop like my dad did to his garage, welders have run from that before

[Charley]

piggy back off the street lamps at the back of your house!

Only problem you can only weld at night!

[G man]

Originally Posted by Charley

piggy back off the street lamps at the back of your house!

Only problem you can only weld at night!

Charley, You need to stop winding that chap Dry suit diver up. wasn't he the chap who was going to report you for offering advise on how to fiddle your meter.

Now you let the cat out of the bag about the street light scam.

Next youll be telling everyone about the tropical greenhouse that you have connected via a contactor so when they pull the main fuse it goes off ( woops )

Oh and your pool on the Tee joint from the RAF base next door.

You'll never learn.

I was going to offer Scooby the cable but Its worth so much I'll scrap it, can I borrow your works van to drop it at the scrappy.

G.

[stevechesh]

Originally Posted by Charley

piggy back off the street lamps at the back of your house!

Only problem you can only weld at night!

If you accidentaly on purpose, cover up the light sensor on the top, it might just work

[turbanator]

Originally Posted by dry suit diver

garage is outside the equipotential zone so will require an earth rod at the Consumer unit you will need to fit inside the garage.( ESQC regs will come into force and the REC are starting to get a bit touchy about the use of the earth they provide, which they are not obligated to supply to your property)

C&G part 1 assignment 1 IIRC