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  1. M

    am2 motor overload

    Hi has anyone recently done the am2? I just wanted a basic calculation for setting the overload (they give you motor rating in Kw) for the 3 phase dol motor. I have tried looking this up for last few nights, but keep getting inconsistent or over complicated findings. and people at work say...
  2. 1

    Is this genral knowledge

    Or is it in the book (regs) ? I was helping on a job today and paid particular attention to the fact that when the cutout fuse was 100a and the main switch was 100a we had to upgrade the size of the tails to 25mm When it was 60a we didn't! Now I'm not 100% sure if the main switch was 100a 80a...
  3. Y

    Cable rating

    Hi All. Just a quick question regarding cable rating. What is the twin & earth cable rating if it is clipped directly to wall and covered in plaster. What is installation reference method to look at for cable rating in the table 4D5 ?
  4. N

    PV panels limiting to 15A

    Hi guys, i am not sure if i am posting in the right theme, however, can anyone explain why the pv modules can withstand 15A backfeed current? (for example). What determines these 15 A, what part of the pv module blocks the current to 15 amps?
  5. U

    rating of RCD

    Hello guys Ive got a transportable weather testing station that has mainly electronics in it with two racks of 13amp sockets for the computers to run on. The fuse board in the unit is part of the factory fit and has a 300 ma rcd protection the unit is based in a rural location with a TNS...
  6. timo1

    Does anyone know the rating of this paperclip?

    I think it was from staples if that helps
  7. S

    EICR - 4.4 - fire rating of CU - code rating?

    any advice what code to put here if CU looks ok but unsure if the wall it's mounted on, is fire rated?
  8. S

    Vacuum pump rating for drain sucker

    Evening Gents, I have been tasked with designing an electrical system that will suck water from drains about 3 metres down.does anyone know of a vacuum pump that will do the job, that operates at either 24V DC or 48V DC. Thanks Sparky 63
  9. D

    Question regarding instant water heater fuse and main fuse box question

    Good evening all, I have two questions for you, which I would very much appreciate input on :>) 1: I have a Stiebel Eltron DHC hydraulic instantaneous water heater in my toilet room, next to my bedroom. It has not worked since we moved in two weeks ago. It has a switch spur in close proximity...
  10. Resu

    High Voltage Sign and Transformer Rating

    Hi all, two questions that I am hoping someone can shed some light on. 1. What is a typical rating for a high voltage discharge lighting circuit, i.e. a large sign? Can't seem to find anything online and it's not the type of work we do. 2. I'm struggling to find out how to convert kva to watts...
  11. 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...
  12. B

    Buzzer dimmers.?

    Hi, I've read a few threads about buzzing dimmers on here but still have a query and would like some advice please.; Customer has x4 low voltage downlights with electronic transformers for halogen lamps fitted to each downlight. These transformers are 60VA each (Saxby model ET60T-R 20-60VA...
  13. codger

    Temperature rating of equipment.

    An armoured 90 degrees cable is to be installed between two pieces of equipment. The equipment at either end is rated at the standard 70degrees C. The cable was tested as a 70degrees cable but another organisation has said that the cable must be tested as a 90degree cable regardless of the...
  14. B

    Using rotary isolators for switching loads on and off?

    Hi Can you use rotary isolators to switch resistive loads on and off on a regular basis (talking 18KW load here) I personally thought not, that it should be controlled through a contactor but I have seen another installation that is using isolators thx Bigfoots
  15. C

    fuse rating moulded plug

    I PAT tested a Hotpoint Iced Diamond fridge freezer RFAA52. The CE plate on the back said 150W but the moulded plug said 13Amp. I looked up the instruction book on the Hotpoint web site and it said 13amp. I left the 13 amp fuse in the plug but it just seemed to be wrong. I sent an email to...
  16. C

    PAT Fuse rating

    I am an unpaid volunteer at a charity shop in Llanelli and I do PAT testing for them when I am not needed at work. I tested a Hotpoint Iced diamond RFAA52 fridge freezer, the plate on the back said 150 W but it had a moulded plug which said 13 amp. I went on Hotpoint's web site and found the...
  17. K

    DNO specifies fire-rated enclosure

    The DNO (UK Power Networks) has specified that the duct that will carry the DNO supply to a new SFH has to terminate into a 1-hour fire-rated cupboard. The duct will terminate in the basement, and the supply will be 3P 100A each. Which pre-made cupboards would meet the required specs, or if we...
  18. O

    Light switches, MCB's size and Reg 536.5.1

    536.5.1 A switching device shall be protected against overcurrent...... This is hypothetical situation which has some barring on a condition that I have !! So a 10Amp MCB protects the whole lighting circuit on the ground floor of a small office total load with all lights on 7.5A. The...
  19. F

    nominal current rating of main switch

    hi guys if installing a shower consumer unit with a 63amp rcd main switch and a 100 amp OPD PRIMARY SUPPLY then main switch is of a lesser value than the main over current protective device how do we get around this.
  20. 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...

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