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  1. J

    Insulating ceiling - flat roof

    Hi i was wondering could some one help me with my query? I have a ground floor single story extension with a flat felt roof and want to insulate the inside ceiling. I was thinking of installing insluated slabs and plastering , but friends have told me that it is easier to put rolls of...
  2. J

    fireman switch

    Hi i know a fireman switch is usually located outside a building to disconnect high voltage lighting in case of a fire our other situations but could anybody give me other examples of when they are needed and what they are used to disconnect ... main supply for building??? ect.. Thanks
  3. J

    Economy 7

    Hi i was windering is there different types of economy 7.Some places i seen have a seperate board and some dont.Can you get economy 7 to supply all your house , apartment ect.. or is it just for the heating element of the premises or is it a bit of both ...
  4. J

    SWA into a consumer unit

    HI i was wondering what you people on here would find best when terminating an swa at a consumer unit , regarding the armour.
  5. J

    Day Night meters

    Hi i was just wondering could any body shine a light on a query i have regarding the dual rate meters. Ive recently seen a meter room for apartments and was looking at the arrangement. Obviously enough there is the live neutral going through the day night meter but ther is also 3 x 1.5 mm...
  6. J

    Switch Rating

    Hi , i was looking at the back of some plastic roker switches at work and the writing on the switch said 10 ax . It was obviously a 10 amp switch but what did the x represent. I thought it might be for inductive loads. Ive never seen a switch give its inductive rating, ive seen it on an APT...
  7. J

    impedance values

    Hi im a small bit confused about finding the values of the loop impedance of an installation. I fully understand the path of the loop and all that but im stuck on the temperature factors to be applied. If you use a loop impedance tester , is the value displayed the correct value or do you...
  8. J

    Weather Proof Recess Lights

    Hi Does any body have any tips on the installation of those lights that are recessed into the ground. A few friends of mine installed them and had a few snags.Any body install them regularly and have any tips on sealing them etc.. Thanks
  9. J

    Insulation Resistance testing

    I know your meant to disconnect electronic devices from circuit when performing an insulation resistance test. But if you only do a L+N to earth test will this not damage any electronics in the circuit. I am thinking that there is no potential across the live neutral so there will not be damage...
  10. J

    method of wiring lighting circuits

    Hi i read a post which was recently posted about a lighting circuit being wired from the c u as if it was a ring final circuit. Can any one tell me would this have any benefits and any disadvantages. I can think of one myself, if a lable became loose and came out of its terminal it could...
  11. J

    Garage as a TT

    I recently did City and Guilds 2360 and one of the projects is a detached garage.Can any one explain why the garage is converted to a TT system ,as the house is a Pme.We were never told why
  12. J

    Stupid Question

    Ok ill get slated for asking this question but i wanna know some times the small things dont pop up in college If you touch a neutral thats in circuit will you get a shock? Its not open circuit just imagine your touching the terminal of a socket Would a load being connected effect it
  13. J

    exporting earths

    Hi ive been doin a little searching here on exporting earths and need a bit of clearing up. Am i wrong to believe if a house is pme and you supply a shed ,you must not usually connect the earths due to different potentials between the buildings .Drive a rod for shed and make it tt. Can you...
  14. J

    location in 7671

    hi im doing a project for my city and guilds 2360 cousre b think thats the name of it anyway, its a detached garage.Ive found info i need bout conduit spans 3 m, minimum diameter 20 mm and height above ground 3m but cannot locate them in the regs.Im new to 7671 so could aanyone tell me...
  15. J

    Fan switch wire

    Why sometimes can you switch a bathroom extractor fan on with a light switch wire is there a reason or pure laziness,are you still required to use a 3P switch if using this method ,its been annoying me for last few days
  16. J

    Halogen Lamps

    Hi ,today a worker on site came looking for a halogen bulb 500w ,he said two had already blown yesterday first one in about an hour replaced it and second lamp only lasted 5 mins.I asked did he touch the surface with bare hands and he admitted he had (didnt know better) and also he had the...
  17. J

    Street light Wattage

    Hi i dont know if there is a rough answer or a ball park figure here but what wattage would street lights be SOX,SON or even MBI If there is too many variations thanks anyway
  18. J

    Rcd and TT

    Hi just wondering bout a senario that i could be up against soon. Ive to upgrade a fuse board to a new one(needs a rewire but that ll be later) the system is TT i think after the MSF can i just use an rcd 30ma on the sockets or does the whole installation need to be protected by a certain...
  19. J

    Tncs Pme

    Is tncs the same as pme do you need an earth rod driven into the ground as back up for the above This might sound stupid but when we wire houses they are supplied with a concetric cable we put in a neutralising link as usaul,but recently we wired a commercial unit,bein supplied with three...
  20. J

    Generator info

    Hi i was scouring the web for ifoon generators and found this article http://www.deir.qld.gov.au/electricalsafety/livingaroundelectricity/generator/general/index.htm Could a neighbour be supplied (or hurt) from your generator if the power went down,you plugged a genny into your socket...
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