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  1. D

    How to move primary ground at water heater.

    Hello, from North Texas, I am a long time DIYer. I have a question about possibly changing or moving the electrical ground from the electrical load center, breaker box, that is clamped to the cold water copper supply line at the electric water heater. The breaker box is marked "Primary ground...
  2. R

    Does anyone know the BS(EN) for this primary supply overcurrent protective device device

    Can anyone give me the BS no. for this please
  3. UKMeterman

    Wanted supplier 15:5A wound primary Current Transformer

    Hi, I am looking for a 15:5A CT supplier, Farnell don't do them, any others? Thanks
  4. Lou

    CBS Electrical Services

    Prior to establishing CBS Electrical Charles Stewart (owner), was the electrical supervisor for a large plc, in partnership with Cheshire County Council, looking after most Cheshire/ West / East schools and corporate stock with 30 years of experience in the industry. Charles is therefore very...
  5. S

    Advice required on PowerRail 303 kWh & kW Meter

    I have just replaced the PowerRail 300 with the 303, used existing CT's, 3 phase installation in small work shop. This is the first time that I have completed this type of installation The Customer states that the reading is higher than expected, CT set to 100 amp. I am a little stumped to why...
  6. E

    Help with inverter for Motor home.

    Hi I am buying a new Motor home, & want to do away with my generator. I know that running an inverter draws a lot of power from a Leisure Battery. I found this site that recommends connecting a pure sine wave Inverter to the Engine battery, rather than the leisure battery. I only need to use it...
  7. grumpyjohn01

    Electric Underfloor Heating as Primary heat source under Engineered Wood?

    Hi all, Looking for advice, I am an experienced electrician and have been asked by a customer to install electric underfloor heating throughout a converted victorian chapel as a primary heat source. The customer is open to all options. I am intending to have a professional appraisal from a...
  8. telectrix

    110v Site Tx.

    bought a 1KVA tranny from car boot @ weekend. bargain @ £8. reason was to have a lightweight one on the van instaed of lugging my 3.3KVA unit about. anyway, gets it home, plugs it in.. no output. so, top off to find that some donut had fitted in-line fuses to bot L and N into the primary. one of...
  9. i=p/u

    Testing 110 Tx

    Anyone test these before and is there anything you know that I don't. from what I see 110v transformer is supplied from 16A protective device which is a sub main circuit ,Then the 2 x 55v lines are protected by 16A fuses Q. Do I just cables upto primary side?
  10. Y

    Primary design

    Hi all, Don't think I'm duplicating here but if I am feel free to delete, my boss asked me to work out the size of a SWA feeding an extension to a commercial property, basically the contractor wants to get the cable in, before the building design has been finalised, so we're basically playing...
  11. B

    contactor for underfloor heating

    Hi I've installed the electrics for an underfloor heating system. The system has 6 manifolds each with a small pump. There is then a primary pump that pushes hot water through the system from an aerobic digester next door. I have fitted 6 contactor each using a switch wire from the thermostat...
  12. R

    750kva on 200A primary fuses

    11kv/440-750kva 3 phase tx on 200A primary fuses, spotted this at work, whats the max current per phase you can draw on the secondary without rupturing the fuses.
  13. T

    Primary Line Coefficients R,L,G and C

    Can anyone help, how do I calculate Primary Line Coefficients R,L,G and C for a pre determined length of cable, actually the question is asking me to estimate, is there a general rule of thumb to use to do this.
  14. F

    Secondary Switchboard for kitchen from Primary Switchboard

    I am currently working on my kitchen and I am centralising the switches for all appliances (Fridge, 2 Ovens, Induction Hob, Hood, Dishwasher, Washing Machine, boiler and counter sockets) on a secondary switchboard. In order to do that I am running a 6mm multi-thread cable from the main...
  15. M

    primary overcurrent protective device.

    Morning all Eicr asks for characteristics of primary overcurrent protective device which lets be honest sounds straight forward but what if you have 3 phases with 3 separate 300 amp 1361 which supplies a load of other 80 amp 1361 fuses which then supplies your single or 3 phase db which fuse...
  16. T

    Vokera primary thermistor code 71

    I have a wee fault coming up on my wifes grandmothers boiler. Vokera Unica 28He Code 71, there seems to be a problem when heating up the CH or when running DHW it will run for a while then cut out.. Keeps firing up again then refaulting.. I have purchased a new vokera part for it, just...
  17. M

    110v transformers

    again would sincerely appreciate a bitof help have a client who wants a mix of stuff doing all in small numbers not really my normal work but have splashed out on a seward 250 to accomadate him and having a few issues on a coulpe of things namely 110 v transformers could some one please...
  18. U

    Home-made Transformer - Primary Resistance

    Hi all, This is my first post, so forgive me if it is in the wrong section but here goes nothing. I was considering making a transformer myself and basically if I were to power it through a plug socket, would the resistance of the primary have to be high enough to keep the current below 13A...
  19. S

    Form filling primary over current protective device

    On the main over current protective device I'm looking at it states 100 amp 1.3/16 DIA does anyone no what type and Bsen num it is as I can't see it in the regs. Thanks Chris
  20. T

    primary current calculation

    First question from the 2391-20 this week 18 x 24 volt soldering irons to be supplied by a transformer via elv sockets, what is the design current of the primary circuit i said the secondary load was 360va so choose a 400va transformer the primary would be 400/230 = 1.73A, am I wrong or...

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