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difference

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  1. H

    SDS thoughts?

    looking for an sds to core drill since mine hasn't got a clutch and I've read that can lead to broken wrists etc. Can anyone spot the difference between these two? http://www.screwfix.com/p/titan-ttb631sds-5kg-sds-plus-hammer-drill-240v/4172g...
  2. Karin

    Potential Difference Between Neutral And Earth

    evening guys, i think i'm gonna need this one spelled out to me a little if anyone can help. everytime i think i've worked it out i just start to doubt myself and go in circles! double pole isolation is required for TT but not TN systems where neutral can be said to be reliably connected to...
  3. M

    Difference between Module type contactor and normal contactor of same amp rating

    hi guys need to know the differnece between a module type contactor and normal contactor. can we use moudle type contactor for power a distribution box with phase fauiler relay to avoid single phasing. the DB box is not the main db box its made to power three machines a vacuum / compressor...
  4. W

    potential difference

    hello im struggling to get my head around potential difference,i understand about bonding but when it comes to say birds on a wire or not getting a shock if your not grounded confuses me. how does the current know we are not grounded and not conduct through us or a bird as normal ?
  5. M

    Quality of solar panels: quantifying the difference between "cheap" and "good" ones

    Hi, do cheap chinese solar panels really perform less well than better constructed panels? (and how would you identify these better constructed panels?) I am curious about whether they lose efficiency quicker over the years. Are there any numbers out there to quantify this loss of power over...
  6. W

    Hrc fuses

    The question is : Is there a difference in the protection characteristcs of a semi-conductor and a high speed hrc fuse can any one help
  7. C

    Recommendations for Weatherproof Socket Makes?

    Got a 2 gang weatherproof socket to fit soon. Wondering what makes people would suggest? The house is quarter of mile from the sea so gets wind rain and everything else thrown at it! Was looking at the MK masterseal- anybody use them much? worth the pennies?! thanks.
  8. uksparks

    Efficacy Insurance

    Hi, Just about to renew my insurance, for PL and PI and Tools. I am currently with Ageas via the NICEIC, and with the above, i also get £100k of Efficacy Cover. The current policy is £690 per year, and the new company, via simply business, works out at £390 a year, so quite a big difference...
  9. HappyHippyDad

    Why the difference in size of Main earth required for a TT compared to TNC-S?

    I am away from the regs book (but who needs it anyhow Lucien!:D) but I think the minimum size for the Main earth conductor for a TT is 2.5mm or perhaps 4mm as opposed to the minimum for a TNC-S being 16mm for new builds. It is very likely that a TNC-S will have a greater PFC ( compared to a TT)...
  10. C

    main Bonding of Water Pipe - supply not unique to property - Potential difference?

    Hi, I understand according to 411.3.1.2, that main metalic services incomming must be bonded to MET. but what if the water pipe is shared from another property? The premises has its own electrical supply, but the incoming water is not individual but shared. I believe i should still Bond. Could...
  11. P

    Full Calculation of Perspective Fault Current - PFC

    I seem not to have access to the professional forums so I post this here: I understand ohm's law and to get a current you use Volts/Resistance (V/R); so if it's Perspective Fault Current (PFC), it's V/R or Volts/Ze; and we divided by 1000 to convert to kA. Yes? Is there a difference when...
  12. dlt27

    High zs on RCD's.

    Hi all. I carried out an EICR yesterday. It was a BG split load consumer unit and when testing I noticed the zs values were coming out high. I noticed on the 1 rcd there was 0.50 Ohms difference between feed and load side of rcd and on rcd 2 there was 0.60 Ohms difference. Just wondered if...
  13. S

    Difference between Drivers and PSUs??

    Whatbos the difference between an LED 'driver' and a 'PSU'? I have been steered towards some divers to power some 3w 3v 900mA Cree LEDs (link below) but they still require the equivalent power input from a PSU. So what does the driver actually do...
  14. P

    correct way to test potential difference?

    elo guys, could someone explain how to test the potential difference between the main earthing and water pipes and what test instrument i should use?
  15. E

    Does 10 volts and 10 heartz make much of a difference

    Speaking hypothetically if I was able to buy battery operated tools from the Us of A and not pay import duty or postage would the charger still work?
  16. D

    Bosch or Hilti

    Upgrading my power tools and not sure wether to go for Bosch or Hilti... I use Bosch at the moment but it's my dads old gear so is getting on a bit and the batteries are a nightmare! But it's done me well. Although i had a go of a Hilti sds at the weekend and it was brilliant... Do i pay more...
  17. B

    PIR Problem

    Hello folks, I have just had a PIR fitted by a qualified electrician but am having problems with it. I'm sure that I don't need to go back to him with the problem, I couldn't anyway as he has gone off on hols now. The problem that I have is, the lights keep being activated even in the very...
  18. A

    Determining CSA of tails and sub mains

    So how do you guys determine the size of existing tails and sub main conductors when carrying out EICR or surveys. The reason I ask is, today I have been looking through some EICR and the conductor size stated of some of tails and sub mains is different to what I thought just by having a quick...
  19. R

    Motor difference - 230v TP or 400v TP.

    I'm building a new head for a milling machine using a three phase motor and VFD. VFD's seem to be much cheaper for 230v rather than 400v, is there any disadvantage to running a motor at 230v TP than 400v TP? I have a 400v three phase supply. Thanks,
  20. S

    What's the difference??

    Hi I'm new to this forum so hello all,i would like to know the answer to this question.i come across this quite often where a radial circuit feeding 1 double socket had been connected to the same mcb as the ring main,now as we know a radial circuit feeding a socket should be protected by a 20amp...

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