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  1. gazdkw82

    Single phase load 3 phase supply

    been helping out at a local industrial unit today and something got me thinking. There was an old 3 phase isolation switch that was still live from 3 phase DB2 however there was no load from the switch. The owner wants some power sockets and lighting on the upstairs mezzanine area so the 3...
  2. M

    LED lights from dimmer flickering. Load is below dimmers minimum rating.

    Hello. So I've learned a lot about dimmers on this last job. The customer wanted everything downstairs on dimmers and boy has it been a learning curve. I've split a lighting circuit and the customer has asked for 2 x st64 led bulbs on pendants to be put on a dimmer. The problem is they're...
  3. A

    Load Balancing

    how do i balance the three phase system wire into 5 floors?... give me examples plz plz help
  4. Davisonp

    Voltage Drop When Load Is Applied Question

    Hi, I came across a situation recently while investigating a problem where measuring voltage at a set of 4 sockets read 243 Volts with no load, and when a 21 Amp load is applied, the voltage then reads 230 Volts. Is it normal to have such a large voltage drop under load? Or does it imply the...
  5. A

    Demand load

    Could any one please tell me what I'm missing and how did they calculate that ....
  6. M

    DICR - Split load boards in HMOs

    How would you code for circuits not protected by RCD in HMOs, the circuits being, lighting, water heaters and storage heating? I'm thinking code 3, my main concern is the switch drops having no protection, just wondered if others agree.
  7. A

    Connecting load to a live FSU - Legal?

    I work with fire alarm panels and have recently come across a situation where my customer could not isolate the FSU recently installed for me as the FSU was fed from a breaker than would have caused major disruption if knocked off. Now when I did my City&guilds 2330 & BS7671 they taught me no...
  8. M

    Inverter connected on the "Load" of an MTTP controller, is that alright?

    Hi, I have a client whose inverter is connected on the "Load" of his MTTP controller. I am wondering whether that's alright in terms of maximal draw: could the MPPT controller be damaged if the inverter draws too much current? (the cables are big enough to carry the current, but I'm not sure...
  9. E

    EICR code - potential load on lighting circuit more than MCB rating

    I'm writing up an EICR. On one of the lighting circuits the potential load is theoretically about 1300W on a 5A BS3871 breaker. In reality, the arrangement has been in place for at least 8 years there are no signs of thermal damage, it is difficult to find lamps these days that would max out all...
  10. K

    Earth leakage current issue (no load connected)

    I've come across a problem today that has completely stumped me. I used my clamp meter on the main protective conductor and found there was over 4A flowing. Checking the line and neutral conductors, they each had exactly 2A. Obviously these numbers do not add up as if there was leakage to earth...
  11. P

    Monitors providing insufficient load for insulation test

    We have hit a snag with PAT testing of some computer monitors in our school (class I). We have a basic battery powered Seamark PrimeTest 50 PAT tester. Earth test passes fine, but then the insulation test gets stuck on "Check Connections", which means the monitor is not providing sufficient...
  12. D

    Not an electrician, need advice re: load on mains power

    Hi all, I have no knowledge in your field and would really appreciate some advice. I am setting up a temporary sound-installation in the corner of a park. There is a school approximately 100m from the installation site. The installation requires 8 powered speakers and a laptop. I am hoping to...
  13. K

    Is 20A double pole switch sufficient for total load rating of two ovens?

    Hi there, I'm installing two ovens, each with a total load rating of 3.5kW. (see details of oven here). The kitchen already has a 20A double pole switch and a 45A dual outlet plate. Is the switch sufficient because I've calculated that the current is likely to exceed 20A? However, I'm not sure...
  14. F

    Total load on distribution board

    Hi im looking for someone to help me understand the total load that can be pull from a dis board. Ie: I have 3phase dis board on a 250amp breaker. The board is filled with mcbs of mixed ratings. However if I add the rating of each MCB together it far exceeds the 250amp breaker on the board...
  15. linuxthefish

    Maximum load for shaver socket in bathroom?

    Hi, what's the maximum load I can run from a shaver socket in a bathroom? Can I run speakers in the bathroom from this point? If that load is maximum, can I put extension cable into the bathroom and how long does it need to be away from the shower?
  16. A

    Load Calculations

    When calculating load calculation for sub-DBs and Main DBs breakers, as well as the final load at the end (let's say in Amps). how do you do it? Do you include a safety factor (to account for spikes) and a diversity factor (to account for the design factors - e.g. lights are only going to be...
  17. Joe S

    Opinions on the load of this cooker circuit???

    I have been to look at a job tonight for a new oven to be installed. The circuit is a 6mm T&E with 32a MCB. The appliance end of the circuit has the Electric hob (5.7kw) wired into a Cooker connection point and it also has a spur in 2.5mm for the old oven which has been binned. They have bought...
  18. D

    Electrical Load or Amps

    I have a small building to design. The main supply is from another building (existing) which is 3 phase and 63A protection (not sure about it). It is 7 way and 3 are spare. L1 is 96A, L2 is 54A and L3 is 84A. I am looking forward to use L2. But the new building have a load of 82.1A and...
  19. C

    LED 'Dummy Load'

    I'm having no end of issues with a current install. What I've got is two 3gang dimmer switches from Lightwave RF. Gang 1 - Auraled 240v 5w Warm White LED Dimmable Lamp x4 Gang 2 - Auraled 240v 5w Warm White LED Dimmable Lamp x6 Gang 3 - Auraled 240v 5w Warm White LED Dimmable Lamp x2 Gang 4 -...
  20. P

    Mains networking on split load board

    I am trying to use a pair of TP-LINK mains adaptors for extending the Wi-Fi in my 3 storey house. I cannot get the two units to communicate so I am wondering if it they would be affected by being on different RCD's of a split load board or would this not matter. Does anyone know which...

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