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As an electrician, what can I do but follow BS7671. The technical staff at the IET are a bit reactive, yes when it comes to surge, (and possibly RCDs) just look at all that nonsense in chapter 44 with the risk assessment calculations in the initial 18th edition. That was all soon dropped. Is...

Surge is pretty much a requirement on all new installs. The company Surge devices have some good content and advice, which may help in you decision, and they are very helpful. You have the space in the board. The actual surge kit would be about £60, with Labour £200 would be a ball park amount...

A few motor plates the all suggest the delta is the 230 and Star 400? Whilst Im on it, can I ask another couple of basic questions If we were to connect a single phase motor we could us either a 230v or 400 V coil, as the 230v could pull in the contacts, with a neutral to the coil? and a...

https://www.plantengineering.com/articles/decoding-your-motors-nameplate/ Where there is more than one voltage figure listed, the delta (△) connection is the lo-voltage connection, while the star (Ｙ) configuration is for a high-voltage connection. The wiring diagram for both delta and star...

Thank you, I think I understand that but it brings me back to the U220-240 D / 380-415 Y (simplified) U 230 D / 400 Y What you say suggests to me that D should be 400 and Y 230

Don't think I've explained myself very well. So if we had voltages of 230V and 400V Ive basically got no understanding of motors We have L1 L2 and L3 coming into the motor all at 230 V Each phase is 230V and if we go between them its 400 We have U1 V1 W1 And W2 U2 V2 Star...

Been reading up on DOL starters, as needed for AM2. I have a couple of questions please. For motors less than 4kW Can a DOL starter be used for a star connected motor and a Delta connected motor? Why would you chose one over the other. ( I know a little about the start up currents, and the...

Thank you for the comments Bernard you mention an auxiliary item that could be causing the 200Ω resistance when hot. I left the meter connected as it cooled down and it very slowly started to go down back to the 30Ω range. At JohnW2 Yes it took about 2:30 minutes to warm up , then off for...

Thank you, Re the voltage. Yes its 239V PF of 1

Curious about the cost of running appliances. I understand the basic kWh rating to get an idea But have been playing around with a plug in small oven. Its rated at 1300 watts, but uses 1400w according to my plug in energy monitor It draws about 5.8 Amps I measured the resistance between live and...

Hard to say I understand. But....3 bed house, gas heating and water. four people. LED lighting throughout. No EV or large loads. 'Normal use' Average Electric use is 500kWh per month. Would that seem a typical usage?

I have some basic three phase question, if someone could help with please. I have left power factor a 1 for simplicity. If I have a 63A three phase and neutral BS 60390 socket - I presume that means it can carry 63A per phase so 189A.? But because of the displacement of the windings, you would...

Hello. What is the best way to control an immersion that has two elements with an economy 7 tarriff The bottom element is on the off peak supply The top element is on the peak supply. Both are controlled by a simple switch. Is it just best to leave the off peak switched on all the time, and...