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  1. mrloy99

    What trips an RCD????

    Hi Barry what about 3 phase rcds? whats the deal with them?
  2. mrloy99

    rcbo's for comercial kitchen

    Hi, if you are doing any alterations or additions it is quite likely that you will be issueing an EIC or a MWC, and "the contractor shall record any defects found in the existing installation" and all your aforementioned rcd absenses sound like worth bringing to the owners attention,and I...
  3. mrloy99

    Testing 480v system

    Must be very close to supply transformer,normally you would expect 240/460volts.But I don't see any reason why you couldn't treat it as 3 phase provided you have it suitably labled up.You should try and balance your load as much as possable.It's unlikely that you would have many loads using...
  4. mrloy99

    Cordless Circular Saw

    Ryobi do a great range of about 30 odd cordless power tools --all useing the same 18volt battery--I've just invested in their radio which seems very robust--they also sell a lot of kit bare--ie,power tool only so you don't end up with a load of duplicated chargers and batteries.--My only gripe...
  5. mrloy99

    rcd query

    Thanks doomed,,but I am more concerned with their useage/lack of usage/ -----and the lack of knowledge by us"experts" in the electrical community :rolleyes:
  6. mrloy99

    Fire alarm window push and pull

    Yep ,I've come accross an odd one like that too. smoke is the biggest killer
  7. mrloy99

    cable routing / perscribed zones

    I worked for a while in Ireland and found standars there rather low, above suspended ceilings it was like a spiders web, cables on the ceiling etc etc, and as for the distribution boards, they were a fire hazard in the making Seen some rough stuff myself alright--At least we make the effort...
  8. mrloy99

    rcd query

    Thanks wotsit THATS wot I said I think maybe you are confused I wasn't talking about under fault condition
  9. mrloy99

    Fire alarm window push and pull

    Hi sparky dan ,you dont mention if you want the window to close again automatically after the fire condition has cleared or if this is to be done manually.? But if you want it to be totally automatic open on fire and close when it clears you will need to install an additional changeover relay...
  10. mrloy99

    18th edition update

    In Canada (& us) their rcd sockets are rated at 6 or 10ma rather than our requirement for 30ma. They call them GFCI's over there....ground fault circuit interupters. Maybe we'll have to go to 10ma as well;) in the 18th
  11. mrloy99

    rcd query

    Hi all, I remember when the use of rcd socketsfirst became widespread(before they were generally being incorporated in consumer units) We were told then that there were two types "latching" and "non-latching" . The first type would re energize after a power failure --usefull for a...
  12. mrloy99

    Insulation Resistance

    Yes..but you might also wish to get the condition checked with respect to insulation breakdown occuring between live and neutral,which WILL require the disconnection of current useing equipment.Its your house thats getting renovated and now is the time to check for potentially looming problems...
  13. mrloy99

    TT Systems

    Hi Daisy just a few pointers 1--your time delayed one would be closest to the origin. 2--you would have structural steelwork supplementry bonding efectively lowering your ohmic values 3--have a look at table 41.5-----30ma Zs1553ohms 4--if each sub board is supplied TT they could be treated as...
  14. mrloy99

    cable routing / perscribed zones

    Yous boys get away with some shoddy workmanship over there.I've yet to see capping in use over here (N.Ireland) We ALWAYS use conduit tracked into the walls.. I couldn't believe the stuff I saw in London---just like the o.p.'s photo.
  15. mrloy99

    3 bar electric fires?

    Dunno about being illegal!! bit of a fire risk maybe if used for drying clothing or maybe a newspaper could blow against it.They should be used with a guard same as an open fire.
  16. mrloy99

    6 Kw pond heater

    sounds like it will cost a bomb to run this 6kw heater! I doubt very much that you would need anything so powerfull. How much is electric nowadays 15p a kw/hr ? times 6 =90p an hour you might find it a lot cheaper to run a small bore loop of plastic pipe off the central heating system...
  17. mrloy99

    How big must the earth conductor be ???

    fault current withstand yes but what about earth loop impedence?
  18. mrloy99

    has any one got an idea

    Transient overvoltages spring to mind.mov--metal oxide varister might cure it.If your friends house is very close to the supply transformer you could try upgrading his mcb to one rated at 6 or even 10ka
  19. mrloy99

    Flicking MR11 & 16 halogen lamps

    I thought it might be something to do with the pins oxidizing or some coating forming over them,and the lampholder socket being of disimilar metals.And the slight movement was enough to scratch through this coating and establish contact again. I would be interested in finding the real answer...
  20. mrloy99

    Water heaters

    Hmmm---Ideally they of course should be on their own circuit--but I dunno if i'd agree with the 15litre bit though.some of these instantaneous heaters and showers only would hold a couple of litres.

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