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  1. S

    3 phase loading question

    Hello all I am working for a company and we are installing supplies to some industrial 3 phase heaters in a factory in Devon. I am questioning the maths used by my boss to arrive at the SWA size to supply these heaters. Seeing as I am not a wiz with 3 phase stuff (only just started working for...
  2. N

    Loading a ring circuit

    I am installing two 2Kw convector heaters in a small flat. The obvious way would be to connect them to the ring, especially since they each have a 13A plug. However 4Kw sounds a lot to me on a ring. Its rather more than an immersion heater! but on the other hand no where near the 7.3Kw for...
  3. C

    Structural Engineers Reports?!

    Hi all, Just wondering what you do regarding Structural engineers reports, seems a bit of a grey area and id be interested to see if you guys get reports and if so are they remote or onsite visits? We only install on domestics and none are very old ie old cottages or farms, to be honest the...
  4. X

    replacing mains fuse box and socket loading

    hi we moved into a house few months ago and had an electrician come out today to fix a problem with bathroom extractor fan. all fixed now. however he looked at the mains box and said that it appears that all sockets in house are in one ring circuit of 30A. thats not a good practice as i...
  5. S

    online solar calculator

    Hi, I recently received an e-mail (and subsequently cannot find anymore!) which indicated that an online software tool was available for solar PV calculations. The bit which I was particularly interested in, was the wind loading, snow loading reports etc. Has anyone else recently seen...
  6. S

    Loading Calculations

    HI Fellas. Just a quick question for a brain box out there :)) Got a classroom that's been refurbished , that im testing. They have a Dorman Smith 3 phase 6 way Db with a 125 Amp main switch. Does anyone know the calculation to work out the total loading on each phase. There are 12 X 10.7KW...
  7. F

    Up loading photos

    How do I get photos from I phone onto this forumn
  8. C

    100A main breaker tripping with low loading?

    Hi all. I have been asked to price up remedial works for a fault which I haven't traced yet........ Our local village hall has two Crabtree C50 3 phase boards on of which controls the ring mains, lighting cooker etc. This board has 3 RCCB's for the 3 ring main circuits. The POC said they...
  9. S

    Wind loading as per BRE489

    I know this has been covered before but is anyone here still doing this themselves? F=qs x Cp net X Ca x A ref 2 x 980 x 1650 panels = 3.3m2 Qs = 1243 (take from key zone chart in bre495) Pp net = -0.7 & 1.0 Ca = 1.0 (as per recommendations) A ref = 3.3m2 uplift = -2871.33N downwards =...
  10. J

    Neutral Loading

    What current does the neutral take on a 3 phase system? For example if each line conductor pulls 100A, what does the neutral pull? Obviously not 300A, Bit confused, don't really work on 3 phase much.
  11. S

    MCS wind/weight loading advice sought

    Hi We have just had an MCS inspection and have been advised that we need to get independent wind/weight load assessments on each roof we install on, even if it is a new roof. The assessor said that this section of MCS was open to interpretation but may be something they insist on in the...
  12. R

    Loading Cantenary wire?

    Hi Guys, I`ve got 2 x 3core 6mm SWA cables to run overhead from a Barn to the chimmney of house and the run is 20m. Never done this before, do you think this can work and how? I`m concerned about the weight
  13. Rockingit

    Loading calculations and diversity - come and have a go!!

    Hello Troops, This follows a thread from last week about SNE supplies, and many thanks to Tony for already having looked at this off forum just to check I'm not going mad!! We get on a weekly basis someone posting about loading and worries, and we politely tell them about diversity and yes...
  14. A

    Electrical loading

    I m designing the electrical loading for an extension with an existing 4 bed hse. The loading of the existing hse is 1 x electric cooker. 3 sockets in every room and no electric shower. The protective device ( supplier) is 60Amps. The proposed extension is a 1 bed hse with an open plan kitchen...
  15. S

    Ring Main loading

    Hiya guys . have recently run a new ring in to a new kitchen . Not yet second fixed it . Done it as per plan.. It is now apparent that the microwave now is a Microwave /oven combo with a total load of kW. Never hard this but the kitchen guy says the new regs state that anything with a load of...
  16. C

    Up loading photos

    Hows it done pls?
  17. P

    Wind loading calculations

    Hi, Has anybody performed wind load calculations on PV panels? We have to quote for a job located very near the sea in an exposed location. Concerned about environment. Paul
  18. 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...
  19. E

    roof loading

    hello everyone. I'm a sole trader pv installer. I am interested to know if any of you have concerns and customer enquiries with regards to the weight being added to the roof. I have approved document A1/2 but does anybody really know how to calculate the weight so as to comply to 15%. I am...
  20. G

    Generators

    Hi, As part of my college project I need to size and choose a suitable generator unit for my building(supermarket). Does anyone know of a good company that supplies Generators and where i could get information about this. Cheers

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