Hi,
I have a query about calculating current in a 3 phase system. So a 22kw load in 3 phase assuming a power factor of 0.8 would be 22000/(1.732x400x0.8) = 39.69A
and say a 7.2kw load on a single phase supply would be 31.30A if you simply use ohms law.
But what happens when you calculate the...
Could someone help me understand what is cable sleeving? Can we sleeve a 3 phase cable to single phase cable? Is this as per any regs? BS 7671? Could you send me some pictures of the same if you have..
hi
does anyone know if there is a product please that i can use to meter a 3 phase supply (not current drawn at the time, but one which will continue to add up the current used on each phase). I am after one which will just simply clamp onto the tails rather than hard wire one in. Even if i get...
Hi
i need some advise on writing out a electrical cert for a control panel,i have only tested distribution boards has anyone done certs for control panels?.
My query is the panel has overloads for motors,ive done my R1 R2 tests etc how do i record these on the schedule as there not circuit 1-12...
Hi All,
A mate of mine recently acquired a rather nice wood turning lathe they'd like to get running out in their workshop. However he admits his workshop is rather old and while he's not bothered, I'm concerned about drawing too much current (I'm trying to convince him to get the wiring...
I am laying pipes and cables (separated in accordance with local regulations) underground between outbuildings, and will then close up various trenches.
Between one pair of outbuildings I want to connect 3-phase power (they are currently linked by 4 overhead wires, but I have disconnected...
I'm a qualified mechanic but always tackled small electrical jobs without incident. wonder if i can get some advice re a 60's potters wheel.
it consists of :
-a 220-250 volt 3 phase, c/s 50, motor
-an largish oval capacitor [with a resistor between the 2 contacts] some distance away from...
Boiler panel controlling a 3 phase grundfos pump. Pump was tripping thermal overload...
Pump replaced for a single phase grundfos by engineer etc...
I was asked to convert the control circuit to single phase which I did.
But still tripping on the thermal overload.
Set it slightly higher for...
Split phase supply L1+L2 on one phase and L3 on another, EB has 3 phase 4 wire incoming but they’ve been out to check and said it’s split phase, what would you put on certificate? 3 phase 4 wire or 2 phase 3 wire?
I went to some holiday cottages today, the main supply in was 3 phase however only 2 of the phases were used. The L1, L2 and Neutral cables were wired into a three phase meter, then coming out was L1 and Neutral, L2 and Neutral to create two single phase supplies which were divided off using...
Hi All,
Have been reading forums for years now,time came to ask for advice.
Have a job to fit main 3 phase isolator for a shop with flats above.About to 2 nd fix the flats now,when the supply is sorted.There was a single phase to the flats,done some years ago,without any isolators.Now the...
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