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overload

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  1. O

    Waterfall & Motor Overload!!

    As part of a large waterfall installation I'm installing a single phase 0.75kW motor with time clock and need advice on the overload setting please! I was told anything above 0.5hp/0.37kW required a contactor with thermal overload?! I'm aware the 3 phase calculation would be... kW/ Vl x sqrt 3...
  2. ebow72

    Am2 2015

    Hello folks, not posted in a while, been busy. However this week I have been slightly busier than usual. I completed my AM2, results due tomorrow morning 8 AM... I did the PRE AM2, I did find it a big help. Glad I did it. AM2 consisted of the following - Risk Assessment, Safe Isolation. There...
  3. edexlab

    Overload tripping

    At work there has been a problem I've been told about, small 1.8 Kw 3 phase fans tripping the overloads I'm not really involved in this but I am interested...... The fans are run off Inverters and the OL's for any circuit are usually within the control panels, length of run is upto 35 metres...
  4. S

    injection testing of crompton thermal overload

    Evening All, Is there anyone that knows what tests are required when carrying out injection tests on a Crompton Thermal motor overload type CR 12 /13 model. Thanks Sparky 63
  5. F

    will x2 2400w plinth heaters overload my ring circuit?

    Hi I'm due to get my kitchen replaced and will be installing x2 2400w plinth heaters so will I require a seperate circuit or can I connect them to my ring circuit ?
  6. 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...
  7. M

    More overload fusebox!!

    Holiday let sleeping 8+. Gas ch (combi) and cooking. 2 x Wylex rewireable cu's, pme (6mm earthing conductor!), no rcd protection. 16mm dno supply, prob 100A dno fuse, no rating on meter but likely to be 80A 1 x cu for normal (lights, rfc's) etc. 2nd cu 60A rating with 3 x 45A fuses feeding 3 x...
  8. T

    Overload fusebox

    Wylex bs5486 4 way 60 amp max?
  9. A

    Motor overload issues

    I have an issue with a three phase submersible pump. The pump is controlled via a 55v control panel. The panel consists of the mains isolator, the 240 - 55v transformer for the control circuit, relay, contactor and overload. The pump works off three floats, one start one stop and one high level...
  10. F

    dasy chaining boards ?

    a big hotel group has asked us that they want 2 way dbs in each bedroom feeding one socket and 5 lights all led fittings, but they want the supplies to boards daisy chained from 10mm t&e or swa feeding 4 rooms per circuit. the only way ive ever done this is sub per board, but cant find anything...
  11. J

    KVa and ka and overload.

    Hi, I'm an apprentice electrican. Please could someone give me some guidance on this as I am confused? Thanks. What is the difference between overload rating ie 6amp on a circuit breaker and breaking capacity on a circuit breaker ie 10ka? I'm confused. Thanks :)
  12. O

    D.O.L With Timer Circuit

    Hi. I am new to D.O.L but have sussed them out except I have one scenario I still need help with. There is a single phase pool pump which is set to come on with a honeywell single channel 7 day time clock. I have wired the D.O.L as single phase with a 230V coil. The problem is I need the...
  13. M

    Choosing MCB for cable overload protection

    Hello. I need advice about choosing MCB for cable overload protection. I'm using BS7671:2008 Requirements for Electrical Installations. Reg 433.1.1 has 3 requirements: 1. Ib <= In 2. In <= Iz 3. 1.45Iz >= I2 I don't understand reason of 1.45Iz >= I2. And I think this requirements are...
  14. I

    protecting cable inside a distribution panel.

    Hi, Just came across something earlier that made the have a think. Distribution panel fed by 25mm cable. This goes directly in to a D50 breaker. The D50 feeds 4 6mm cables squeezed in top of the MCB that feeds small 3 phase bus bars, these in turn feed 1.5mm circuits. I have fitted MCBs to...
  15. A

    3 phase contactor with overload

    Hi all, Could some one explain the correct way in connecting a 3phase contactor with overload protection. I have the supply going into l1, l2, l3 and motor connected to the load terminals, t1, t2, t3. I also have the 230v connected to the a1 coil and neutral on a2. Just a bit confused...
  16. 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.
  17. T

    Overload?

    Right following on from my last post. i rewired a pizza oven circuit as the oven was being moved.its done in 16mm twin and earth.protected by a 50 a mcb. guynfoned tonight saying after half an hour the circuit tripped so went up the oven is 13 kw can this be an overload?should I put a 63a mcb...
  18. D

    Rcd- mcb

    Hi guys in installing a 16mm submain with a 10mm earth and I'm going to install a 80amp time delay RCD with a 63amp MCB to protect it. Some one said I could just use a 63amp RCD to protect it? Never done this before and wouldn't think you could. Also should I just use a 63amp RCD with a 63amp MCB
  19. A

    Dual Wall Socket Overload?

    Hello, I am an IT Tech and not an Electrician so please excuse my ignorance... I have three monitors, one 860W computer and multiple other devices including printers etc.. plugged into 2 x 7 UK Power Socket Extension Cords which can be found by googling the following: Belkin Conserve Smart AV...
  20. N

    overload

    Hi Guys I hve a ring main that keeps tripping, but it also trips the main rcd on the board, is there a possibility that it is being overloaded? There are about 6 computers a franking machine a photocopier coffee machine and a few other gadgets on this one ring of 10 sockets! Should the ring be...

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