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  1. I

    Cable calc confirmation required!

    Well I calculate both for obvious reasons but have been calculating them both in the same way and ending at the voltage and not calculating the percentage. For example (mVAm x L x Ib) ÷ 1000 = X volts Then as long as its been below 11.5V, all OK But now figured that 11.5V as a percentage of...
  2. I

    Cable calc confirmation required!

    Think I may have been oversizing cables for some three phase circuits... For example, when ive calculated a 11.5V volt drop on a general circuit I've took this as being the 5% allowed but I've just come to realise that maybes this is actually a 2.875% volt drop at 400V Can someone confirm...
  3. I

    Best torque/electric torque screwdriver set?

    Looking to purchase one of the above. Preferably an electric torque if there's such a thing? One I found on the Web said it only tightened to 0.2nM and then had to be manually tightened after that. Any recommendations? Thanks.
  4. I

    Passing another circuit through back box

    Whats not required?
  5. I

    Passing another circuit through back box

    More of an issue if it's a 3phase system and the 2 circuits were on different phases allowing 400V at the box
  6. I

    Niceic new app love it or hate it

    Which app is it? Any links?
  7. I

    Volt drop calculations

    Just curious as to when people are calculating volt drop, how close you allow your calculations to get to the 3% and 5% values before you decide to up the cable size? For example, if your calculations brought you to 11V for a general circuit would you be OK with that?
  8. I

    Cpc connection wylex

    I'm assuming you're working with a 3core or 5core swa and you're using 1 core as the earth?
  9. I

    Surge - Commercial - When is an SPD required?

    Can anyone advise when SPDs are required to be installed on commercial properties? I'll always install them on a full rewire of a commercial property or if I need to install a new DB, I'll make sure to fit one with an SPD installed. What about if its a large store, 36 to 72 way existing board...
  10. I

    Amendment 2 new circuit SPD?

    How many spare ways are in the board?
  11. I

    Cellar cooling fuse rating

    I'll have to check regarding the overload relay but thinking about it I'd imagine there is, yes. I'd still have thought the smaller the fuse size, the safer it would be though. Obviously ensuring its not too small that it would be tripping for no reason.
  12. I

    Cellar cooling fuse rating

    I was thinking more for overload protection. If the motor is only supposed to be running at 12.3A, surely letting it continuously run at say 25-30A as a 32A breaker would can't be good for it?
  13. I

    Cellar cooling fuse rating

    So in this case, the manufacturer has recommend "fuse rating 32A". Would you personally still fit a C32 as they've recommended 32amps or would you ever be tempted to downgrade the fuse rating knowing a C-curve will stop tripping on start?
  14. I

    Cellar cooling fuse rating

    Thanks for the info. I figured a C32 would be too big and a C16 would be better considering the normal running current of 12.1A and a C16 would cope with the 65A start-up current due to the 5-10x tripping characteristics
  15. I

    Cellar cooling fuse rating

    A cellar cooling system with the main supply going to the indoor unit. Spec sheet gives the following figures... 12.1amps FLA 65amps LRA 32amp fuse recommended My question: Why a 32amp fuse? Have they based this on HRC fuses perhaps and not advised that? Wouldnt a C-curve 16amp 60898 be...
  16. I

    Eddy

    Back to my post then, will the use of brass bushes prevent them with brass not being ferrous?
  17. I

    Eddy

    No mention of that as a solution in the regs either? Is there any clarification on that? Thanks!
  18. I

    Eddy

    Is that correct? I've done some research and never heard anyone mention that yet? If so, that means there was never an issue to start with which is the best result.
  19. I

    Eddy

    Hello to all, Rather than start another eddy current thread, thought I'd just tag onto this one. Cables contained in metal trunking which is bushed to the side of a 12TP dis board. Lives and neutrals go through one 50mm brass Bush into RCBOs. The earths go through another 50mm hole which is in...
  20. I

    Amendment 2 and AFDD's

    Ive never seen them put into practice so wasn't sure how sensitive they are. I was just thinking it would make things a lot cheaper until the prices came down. Much like when dual split boards were much cheaper than full RCBO boards but now the prices have dropped.

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