breakers | Page 5

breakers

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  1. A

    Design current and circuit breakers

    Hello, I have a problem with design current (Ib) and selection of the circuit breaker (In). If I have a circuit of 7A and I apply no diversity, then Ib = 7A and I select a 10A circuit breaker. But if I apply diversity and I get, say, 5A, is 5A now the design current Ib? So can I select a 6A...
  2. M

    B type breakers with in line UPS

    Hi I'm hoping that someone can help. I am adapting some circuits which are supplied via an in line ups. At present, the ups supplies a 72 way db and the final circuits are supplied from the DB. This is a laboratory research environment and it is expensive (about £20k a time) when they...
  3. 1capybara

    Table 41.3 Max earth fault loop impedence (Zs)

    The heading of table 41.3 says it shows " max earth fault loop impedance Zs for Circuits Breakers..... giving compliance with 0.4s disconnnect time of 411.3.2.2 and 5s disconnnect time of 411.3.2.3." 411.3.2.2 is for final circuits not exceeding 32A. 411.3.2.3 is for distribution circuits and...
  4. A

    2.5mm2 ring main protected by 20amp breakers

    So an old colleague of mine stipulates that ring main should be protected by 20 amp breakers. Why you ask? Well he said because a piece of 2.5mm2 can only take circa 26 amps and if the ring main broke at any point it would effectively make it two radials, and it would be protected by a 32 amp...
  5. 1capybara

    Who makes this: type B, TP+N panels for DIN rail breakers and dual RCDs ?

    Who makes a TP+N panel, bigger than a consumer unit, for example, 14-way (with space for 12 or 14 three-phase breakers). It should feed its outgoing breakers using bus bars, not wires. (I call this a Type B panel) And it should be usable for Dual RCDs, one for the left side of the panel and one...
  6. J

    d type breakers needing a low zs

    im a 1st year apprentice thats why im asking this question, from what ive gathered the higher the current it takes to trip as in 10 times the rated current etc... for that you need a lower zs than if it was a b type why is that? my thoughts on it is that becuase you have a higher current so...
  7. E

    Ring supplied from two circuit breakers

    Hello guys, hope someone can help me with this. i was carrying out a small job on a ring main (re-fix a socket to a wall nothing major), and noticed that the ring was being supplied from more than one circuit breaker a long with the other ring main in the flat. Obviously i rectified the job as...
  8. M

    MEM circuit breakers

    Have 1200 MEM breakers for sale if anyone interested PM me, bought job lot all brand new I don't use them but may as well go to a good home
  9. S

    Wanted - mem memera 2000 ab mcb 20a type b 6ka bs3871

    Hi fellas, Anybody got any of these breakers kicking about in unit/garage? Trawled ebay but no joy as yet MEM MEMERA 2000 AB MCB 20 AMP TYPE 2 & B M6 BS3871 DELTA CIRCUIT BREAKER
  10. D

    Crabtree c50 breakers

    Are these worth selling or just get rid? Saved from a recent mains change
  11. M

    For Sale Chint Miniature Circuit Breakers MCB & RCBO

    I have for sale the following Chint Miniature Circuit Breakers: 7 x CBG B6 (Amp) MCBs 3 x NB1 B6 (Amp) MCBs 4 x CBG B16 (Amp) MCBs 2 x NB1 B32 (Amp) MCBs 3 x CBG B40 (Amp) MCBs 2 x NB1 B40 (Amp) MCBs 2 x NB3LEU B32 (Amp) RCBOs (Partly Used) £35 for the lot. The MCBs are all unused, they've...
  12. D

    Crabtree MCB circuit breakers 60p each Brand New in Boxes

    Crabtree loadstar single pole circuit breakers 6FS40C - 40 amp type C - 9 in stock 6FS20C - 20 amp type C - 140 in stock 6FS32C - 32 amp type C - 1030 in stock All Brand new and in boxes - 10 in a box 60p each plus P&P P&P is as follows: £3.35 for 1 - 8 MCBs £4.68 for 9 - 16 MCBs £8.60 for...
  13. D

    MCG Breakers

    I have a large amount of MCG single and Triple Pole MCB's i have sold quite a few and have had no complaints about the quality. Is anybody on here interested in buying any or does anybody know anywhere i could get in touch with to try and get rid of some. The only problem with them is that...
  14. C

    Relay control

    Morning, just checking my theory, I have been asked to wire up a panel that would turn on a red beacon if any one of 4 circuit breakers was turned off. just wondering how you guys think is the best way? I was thinking of buying 4 x 230v relays an taking a phase of each breaker to the a1 on the...
  15. W

    Racking out breakers

    I have an interview soon for a maintenance company on a drilling rig and 1 of the questions they asks is when racking out a circuit breaker you hear crackling/arcing do you keep racking out or rack it back in?
  16. K

    D curve breaker

    I have been asked by a customer to solve a problem, he has a 3 phase 20A D curve breaker supplying 3 single phase breakers 2 x 6A and 1 x 2A. The 6A breakers are supplying 2 pumps with a load of about 4A each. When 1 of the pumps are turned on, the 20A trips. Any ideas why? The earth loop...
  17. G

    For Sale Crabtree C50 breakers

    I have 25 crabtree C50 breakers removed for a job all work £10 each plus £2 postage 10 AMP - 5 OF THESE 15 AMP - 5 OF THESE 30 AMP - 7 OF THESE 40 AMP - 1 OF THESE 50 AMP - 3 OF THESE 60 AMP - 4 OF THESE
  18. E

    Testing breakers

    Interesting that we dont test mcb's like we do rcd's. To see if they trip as according to their time/current curves. I'm guessing the practicalities of the test gear is why? Anyone else got any suggestions?!
  19. uksparks

    CU Connected with breakers taken out first

    Hi, Just thought id share my photos of a CU I finished, well almost finished today, just needs another 6A breaker and a couple of the circuits connecting in, but otherwise, its pretty much there! I am so please that I have discovered this new better way of connecting everything, it feels like...
  20. T

    3phase breaker made of 3 single phase breakers

    Hi guys, Is there a difference between 3 single phase breakers next to each other (with a linking bar) and 1 3 phase breaker? Does the 3 phase breaker have anything special in it or is it just 3 single phase breakers stuck together with a bar in the switches? Cheers, Tim

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