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  1. CG_Sparks

    BRE 489 wind Loads equation

    Hi. I'm having a bit of trouble trying to do the calculation in BRE 489 for solar pv wind loads. I understand the equation; F = qs x Cp, net x Ca x Aref But what i don't understand, is what to do with the number at the end. Do i look in say a schuco mounting rail...
  2. R

    Kitchen Ring earth fault?

    Hi guys, Customer woke up this morning with the Main switch/RCD tripped. He narrowed the problem down to the kitcken ring so He unplugged all the counter top appliances and switched all the big under counter appliances off at the switches. I got there and turned the mcb on then plugged the...
  3. W

    crabtree starbreaker

    hi,im after a little advice.a 5+5 consumer unit(star breaker),5 protected and 5 unprotected.the board has 3 un protected circuits ie 2 spare ways and 5 rcd protected circuits no spare ways.my problem is i need to add a new protected circuit.is it possible to move the rcd unit to allow an extra...
  4. R

    Ring and Radial Sockets

    Sometime ago I had my 15yr old, wanting to know the advantages and disadvantages of a ring to a radial sockets, and all I could think of was, you dont have to worry about volt drop in a ring and how much costly it could be, then I realised :banghead: I had been in the trade for while and felt...
  5. P

    Schletter Roof Hook/Wind loadings etc

    Hi does anyone have any information about where I can get technical data on the Schletter roof hooks and rails? I'm trying to determine number of roof hooks etc based on calculated wind loads and want something similar to the Shuco user manual where they specify the roof hook spacings for...
  6. O

    shower loads

    Got a job this morning having to change a shower switch job was only 3 years old and the 40A switch was u/s so I changed it for a 50A rated switch that was ok but the problem was trying to get the 10mm cables terminated and the faceplate pushed back to the wall. Me thinks that because showers...
  7. E

    RCD tripping at half current

    Hi all, Wondering if anyone could throw a few suggestions my way. Was testing a few circuits last week in preparation for additions (extension of house). All going fine until i tested the RCD that the customer currently has installed, it tripped on half current test? I am planning to go back...
  8. F

    Loads of electrical equipment

    hi people everything listed below is brand new boxed and unused. need to make room in my shed, bits ive over ordered and collected in the past couple of months. i would prefer someone to buy the lot and pick up. Make me an offer (no silly offers please) will be going on ebay in the next few days...
  9. J

    FOR SALE - misc mcb's / mccb's

    Hi again, still got loads of mcb's and mccb's for sale still on ebay. please click on this link and then view other items MEM Memshield 2 MCH132 C32 MCB MEM EATON on eBay (end time 05-Jul-11 12:33:48 BST) also have loads of belimo and electro controls actuators and dampers and a few pipe...
  10. E

    Student House PIR

    Here's a few snaps from a PIR I did last week. You might be surprised to know that I concluded that it was "unsatisfactory" and recommended a complete re wire. I could have put another 20 photos on here as it was one of the worst installations I have ever seen. There were mouse droppings all...
  11. 1capybara

    Diversity factor for calculating loads ???

    I am a Yank electrician, I cant find where in 16th or 17th edition you have the diversity factor for calculating loads. Example: 1. In one office or sleeping room I put 4 power sockets on a 32 amp ring circuit. We have 100 identical sleeping rooms or offices. What is the total load that we...
  12. B

    Loads on an FCU on a spur

    A friend of mine has recently asked me to help him do some work in his house, data cabling etc. and wants to put up a small data cabinet in the cupboard... The cupboard already has a double socket on a ring mains, and he is looking to connect this to a FCU which leads onto 2x 6-gang extension...
  13. L

    Wind load calculations

    Hi, Does anyone use any software for wind load calculations. If so how do you use the information to ensure the additional wind load is ok for the structure. I have seen other people use structural engineers but does anyone do it themselves and how. It is ok to say a building (domestic) of...
  14. E

    3 CV's & no jobs.

    So I set up my company this week, starting advertiseing today. As the title of this thread says 3 CV's already!!!!!
  15. J

    FOR SALE - Clean out of stores

    Hi guys, got aload of MCB's / MCCB's / Fuse links for sale- all on the flea bay. Please click on the link below and then view more items. MEM / Merlin / Square D MEM Memshield 2 MCH132 C32 MCB MEM EATON on eBay (end time 17-Apr-11 16:24:30 BST) Also got a range of Damper / Actuators 2 and 3...
  16. S

    RCD Problem

    Hi all Anyone got any thoughts on this.... TNS arrangement ZE = 0.65 ohms ZS on tested circuit 0.85ohms RCD >1999 on 0.5 x 28 & 32 ish ms on 1 x > 40 ms on 0 & 180 degs although the unit did pass on 0 degrees once or twice before failing the 180 Tested my Megger against a known...
  17. C

    ZS testing

    Hi, I,ve got my City and Guilds 2391 but have done little "hands on" testing till now. When ZS testing, eg a fluorescent lighting circuit, and testing at furthermost light fitting, is it OK if fluorescent light fittings are switched on when the test is being carried out ? I don,t think the...
  18. L

    Roof loads and fixings

    Hi, Can anyone suggest software preferably free, that can calculate roof loading and wind loads. Many thanks.
  19. R

    32a 3 phase extension lead.

    My dad wants me to make him an extension lead. Currently a 32A 3 phases soscket on a genrator. He has severral different loads ( all motors) but there total loads are about 20A Use some braided SY cable. 4mm 4core or 5 core? I guess its better to have a seprate earth core so 5 core.I need...
  20. T

    diversity of main supply for distribution board

    i need to wire in a 200a distribution board from a 400a board in an ind factory. Do i take diversity into account. The on-site guide says no but the Bs 7671 says yes but doesnt state if its for distribution boards or single circuits

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