Search results

  1. P

    split concentric cable

    stranded copper central core is available
  2. P

    Table lamp idea

    you can get lamp holders with a built in switch so that the pins are only live when there is a lamp in the holder. They have a small plunger under the lamp base which operates the switch. Not fool proof as you can still press the plunger but better than nothing
  3. P

    Strange Grelco adaptor... a question for the 'vintage' sparkies

    Hello, I think these were used at lower voltages and the extra pin was to prevent the plug being inserted in a normal 230V socket (or 240V as it was). I have seen them on old 12/24/36 V electric blankets but not for 40 years !! These used to have a heavy transformer control box and were rated...
  4. P

    Voltage optimisers and lighting

    voltage optimisers wont save any power with HF ltg anyway, nor with much electronic equipment like PCs nor with A/c plant with Variable speed drives such as most modular kit has these days.... I'm struggling to think what might be left. Id set the optimiser up to 400V which is where it should...
  5. P

    Where to find electrical designers

    Google m&e consultants for your area....
  6. P

    sudden increase in electricity consumption

    .... check that the immersion heater t'stat hasn't failed ....
  7. P

    100amp fuse 16mm tails

    The requirements changed starting about 1980 IIRC shortly following the standardisation on 100A main fuse. Before then 40A 60A and 80A fuses were all common (increasing in holders marked 100A) and many meters were only rated for 60A or 80A. 15th Edition followed as did upgrade of bonding and...
  8. P

    Polyphase supply

    They will be worried about the starting current of the motor. at 6kW if single phase this could be 183A (Direct On Line 7 x full load load). The kit may well have soft start but if you haven't told them they will assume DOL. Even with three phase the DOL starting current would be 61A.These...
  9. P

    House supply of 10mm distance from transformer 115m

    If your legal paperwork say 10mm you could argue that this refers to the diameter. If it says 100mm2 or equivalent then you're a bit stuck. A 10mm diameter cable would be 78mm2 (nearest standard sizes 70mm2 or 95mm2). 70mm2 would prob meet your needs over this distance depending on the...
  10. P

    Flourescent light wierdness

    ... probably a poor connection in one of the end caps, as it warms up the flickering starts.....
  11. P

    Whole House Ventilation capacitor replacement

    I think this contains two capacitors as you say one 2uF and one 3.8uF with common conenction to the flying lead. Suggest you try using three of your 2uF Caps - you can parallel two of them to give 4uF to replace the 3.8uF and use the other as is for the 2uF.
  12. P

    Current change in a reactor by altering the frequency

    ..... as no resistance current = voltage/ X from which current is proportional to 1/X if voltage is the same (RMS value) s o current is proportional to 1/f because X is proportional to f. s o 15 = k/50 where k is a constant. so k= 15*50 = 750. so at 45Hz current = 750/45 = 16.7 A and...
  13. P

    Complex motor start cuasing RCBO to trip problem

    Does the pump have a capacitor start? I've seen faulty caps causing excessive earth leakage on start up which goes as the cap switches out as the motor comes up to speed.
  14. P

    110V distribution system advice

    Take more care on the 110 v side too. The elements may take some time to reach temp compared to normal 230v and so initial current may be quite a bit higher than normal full load so you'll need to allow for this dont size things too tightly.... Manufacturers should help or measure cold...
  15. P

    110V distribution system advice

    you need to look at the inrush thing a bit more - if the isolator is used frequently this could well end up quite unreliable and the type d might fail if exposed repeatedly, you might need a higher rating..... And larger cables .... Or you might find fusing a better solution I'd really want to...
  16. P

    PAYE tax releif on tools

    You can set off the costs of tools. Strictly speaking and especially if they are expensive they will probably have to be treated as a capital item. Are you working on a self employed basis, through your own limited co or as an employee?
  17. P

    110V distribution system advice

    If you want single phase 110v then unless you go for a Scott connected transformer three phase won't help as at best you will end up eith L-N or phase - phase. A Scott connected transformer would distribute the load over the phases better but even then it wouldn't be balanced. It would be an...
  18. P

    3 phase motor rating.

    ...... dont forget about power factor. Esp if its a multipole motor. It may physically that big so it has some more inertia given its for a machine tool.
  19. P

    wtf

    Could be spikes from the electronic control causing currents to flow through capacitive filters on for example a washing machine. Have they got a new washing machine etc recently. Best way to test this is to unplug all the appliances and see if fault goes away. Just disconnecting the live...
  20. P

    Electrician Interviews

    Always interesting to ask about what factors affect the rating of a cable - you can develop the question endlessly......

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Green 2 Go Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses Heating 2 Go
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Advert

YOUR Unread Posts

Daily, weekly or monthly email

Receive a daily, weekly, or monthly email containing a digest of new and recently updated threads.

Advert

TrueNAS JBOD Storage Server

Tilers | UK Tiling Forum | Tilers Forums | Find a Tiler
UK Tiling Forum by Tilers Forums UK
Plumbers Forums | Plumbing Advice | Gas Forum
Back
Top