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Gotcha now I think. 3 Phase Current - I=P/V root 3 Thus I= 3000/400 X 1.732 I= 12.99/3 = 4.33A per Phase

I'm sorry KME, your reply was helpful and for that I'm grateful, I just don't see the need for the unhelpful comments, whether tongue in cheek or not. Sometimes you can stare at a book and re-read things many times over before the penny finally drops, but I will go back and try to make sense of...

Your reply was fine without the FFS, there's really no need. Silly me for thinking the forum was a place where knowledge could be gained by those wishing to gain it, given by those willing to share it. Cheers!

Now that's really put the cat in! Tell me more.

Just a little confused about the power distribution in the 3 phases. I may have this all a..e about face but isn't there only 2 of the 3 phases supplying power at any one time due to the 120 Degree differance in wave? Please enlighten as this does confuse me.

Here goes, 1000w / 400v = 2.5A three or four core SWA Ref. Method C (Clipped Direct) 1.5mm csa carries 18A All protected by a 6A triple pole MCB

Hi All, The Question..... We have a water/immersion heater tank, Rating 3Kw Phase : 1/3 Voltage : 230/400 Now I take it from this the tank can be connected to either a single or 3 phase supply. Now if we assume a cable run of 10m from the board what would be the cable size and breaker...

My assesor (Elecsa) was happy to accept Cal Card readings for my Multi-Function tester, as long as I use the same socket for RCD & Zs checks.

Told them I will give them a couple of hours in the morning as they've looked after me, tea, sarnies etc. After that the meters running! I did make it clear at the outset there may be faults highlighted, and that it would incur extra cost.

This is what leads me to believe it's a crossed/borrowed neutral. R1 + R2 not affected IR not affected I'm thinking that when I go back in the morning, disconnecting the sockets neutral in the board will clear the tripping, then I can set to work on some floorboards!

Cu change today, nice and straight forward, posh new tails, new 16mm earth, Bonds to gas and water, 10 way dual RCD MK for an old Wylex rewirables jobby. Easy, NOT! Did all the usual dead tests with no traumas, popped it all together and energised, hey presto, downstairs lights tripping RCD...

Reckon you are probably right there Specs! I coudn't tie some of the knots they get into!

I like my Megger, only critisism being the tangly leads!

Hi, Didn't say there was a problem, just the fact that a 40A Type B RCBO will happily carry 50A all day without tripping, and 6mm cable is rated at 47A at the very best, makes me err on the side of caution. A 32A breaker would be more than enough for an 8500w load, just me I guess ----------...

Does it trip on switching the pullcord, or when the shower is turned on? Did you check connections?

Would also have used a 32A. 40A sailing a bit close to the wind for me with 6mm

Interest Rates Go up Less money around to play with (unless you're a banker!) Less money around = less spending so goods get cheaper (in theory) Inflation comes down.

Are those live busbars attached to the DIN rail? :Applaud

Hello Danielle, and welcome to the forum. Only advice I can give is to put pen to paper to all your local contractors. Offer a couple of weeks free help so they can see your work ethic and hopefully one will take you on. Good luck.

Hello Danielle, and welcome to the forum. Only advice I can give is to put pen to paper to all your local contractors. Offer a couple of weeks free help so they can see your work ethic and hopefully one will take you on. Good luck.