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  1. 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...
  2. 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.
  3. 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...
  4. R

    fuse rating or setting

    Ive searched but cant find any info on the following- On the certs forms under main switch or circuit breaker it asks Fuse /device rating or setting??:santa_cheesy:
  5. T

    IP rating for hand driers in toilets

    At the Church I attend, two hand driers need replacing in the toilets. One is a sensible distance away from the nearest water - about 1.5m - while the other one is very close to a basin. I understand that a toilet - no bath or shower - is not subject to any special regulations. Nevertheless...
  6. S

    hot shower swtch

    Hi , the switch to my shower gets very hot after the shower has been running for around 3 minutes .The shower was fitted about a year ago and has been fine up to now, the wires in the swutc are all in place and tight.. thanks
  7. joel89

    Contactor Coil Current Rating?

    Just out of interest what current does an AC Contactor coil take? I keep using 300va transformers in my panel builds but never take coil currents into account mainly only have up to 8 contactors. Cheers
  8. S

    shed lighting and cable rating

    Hey guys, studying to be a sparky and stuck on a question. The question is to install 2x65W fluorescent lights (single unit) in a garden shed which is attached to the side of the...
  9. D

    Different cable rating on circuit

    Hi first post here, if during a rewire customer decides they want to keep existing 6mm cable from isolator point to shower so as not to rip up their bathroom wall (& of course keep same shower), but wants a new 10mm cable to isolator point for future use, is a fcu required between the different...
  10. Mark.W

    AC cable rating for a 1MW PV install

    Hi Chaps Just as a matter of interest really, can I use derating factors when designing the ac cable size? eg PVWatts gives a derating factor of 0.77. PVWATTS: Changing System Parameters So for a 1kW install the actual ac power would only be 770W, could I then design my cable on 770W...
  11. M

    New Zealand ka rating

    Aye ups forumers Where can I find ka ratings for 1361 type 2 100, 80, 60 Bs 88- 100,80,60 Lost
  12. B

    2P 63A mcb Rating help?

    Hi Everyone, I have two guys telling me different things on a 2P 63A mcb. 1 guy says it's rated to 125A (effective 2x63) 1 guy says it's 80% of this (100A) Anybody know who's right and why? Cheers.
  13. W

    Changing main switch on CU

    Hi all Just looking for some advice pls. I've been told that I need a new CU as the existing main switch has the wrong rating. Isn't possible to just change the main switch. Existing CU is Marbo. Many thanks
  14. R

    160A breaker question?

    Can somebody tell me why on the 3 phase circuit breaker in question has a 160A rating on the supply side and on the bus bar side it says 100A. The breaker is an old GE RECORD, it also has a red button on the bus bar side of breaker. Is anybody familiar with the breaker I am explaining. Cheers
  15. G

    Watt Rating

    Hello guys!! I am new to this forum. I have this query. I am planning to buy ceiling fan. Now I want to figure out how much fan will cost me on per hour basis. Its say following specifications. Now it costs me Rs.7 per unit. Can anyone help me figure my hourly cost? Also when it says 74 W...
  16. R

    3 phase motor rating.

    Firstly, I'm not doing this, I'm getting someone else to. I'm just interested. I have a machine arriving which has a largish motor, the plate on it is the one below. The horsepower is 0.6 but the current stated is 2.4A. This to me doesn't work out, is this the in-rush current? The motor is...
  17. S

    bad workmanship??!

    Hi lads, just had a look at some wiring done in a friends bathroom. All looks good apart from elec rad..... Feed to flex output for rad in 1.5mm t@e but the feed to the rcd fuse spur (outside of bathroom next to skt)is 0.75 flex. Not seen this before, is it ok? Rad is 400w Cheers
  18. A

    Amp rating on crocodile clips

    I have a 12V leisure battery and a 1000W power inverter. I want to find out what suitable crocodile clips I need (which will be connected on to the battery terminals, from a cable running to the back of the inverter). I notice that crocodile clips have an amperage rating (e.g. 50amp or 500amp)...
  19. O

    Dimmer overload

    I'm part qualified so you'll have to forgive my tiny brain... 12 x 50w Gu10s that have munched a couple of dimmers.(a silly load for a room that's abut 8 Msq) I understand that with these halogens I may have to de rate the dimmer which would mean a 1200 watt dimmer (a bit pricy by the looks...
  20. T

    What IP rating is this?

    Hi guys, Thought id share a recent eicr find with you. An outside board controlling lamposts/flood lights, and yes the door is shut as fully as it will. Copper is meant to be this colour right? Who needs blanks? Who needs armoured glands anyway? The cable hanging down is live Tim

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