1. Ironbones

    Commercial DC circuit breakers VS semiconductor fuses high speed.

    Hi all. Just to start off still learning. Could any one help me with this and put me right if I am incorrect. I would like to understand the preference or reason for opting for DC breakers or semiconductor high speed fuses, when been used in low voltage DC circuit. I understand that...
  2. T

    Commercial DB location, client access to breakers

    What are your thoughts on letting customers access a fuseboard? I'm working for a company that rents out rooms by the hour for people to play musical instruments and they often trip the power. These are unmanned premises. I've been asked to place a fuseboard in the corridor with RCBOs for the...
  3. Bob Geldoff1234

    Domestic Breakers upside down

    Called to a house today to just change some switches and went to the mains to switch off.This is what I was presented with. If you notice all the breakers have been put in upside down. My question is would they still work in a fault condition in that position?
  4. S

    Industrial max zs for 1492 and 1489 allen bradley breakers

    Hi we are using allen Bradley 1489 and 1492 range of circuit breakers, and I cant find the max zs values on any of the data sheets, does anyone have a list of them? Many thanks
  5. telectrix

    crabtree breakers. what fits?

    need 5 MCBs, single phase, but to fit in a 3 phase board. the existing ones are crabtree 6HSO. are the polestar,loadstar or what? they are not starbreaker types. busbar connection is a screw termilal.
  6. MFS Electrical

    Dorman Smith loadmaster breakers

    Replaced an old TP&N Dorman Smith DB the other week there with a nice shiny new one, So being a nosy sod and wondering why old dorman smith breakers don’t ever seem to trip I decided to drill out the rivets and have a peek inside. All I can say is no wonder they never trip:eek: there is no coil...
  7. M

    type fitted breakers

    i see that in the 18th edition there is now a coding for type fitting , i have been coding any mix and match breakers as code 2 , after contacting lots of manufacturers there guidance is always that they have not type tested any other manufacturers products for there boards, as we know many...
  8. P

    Domestic Circuit Breakers help :-)

    Hi all, new member so please go gentle... I have been in my newbuilt for a while now but this weekend was the first time I tried to fire the angle grinder and subsequently the hoover to do some work. As you would expect, I was using the garage power sockets. However, the circuit breaker kept...
  9. Torcikas

    Cables, Rcbo's, old breakers

    Hey moving out in few month, selling all my stuff. So i have twin and earth 1.5/2.5 like 200-300 meters each, 3 core few hundred. Rcbos B6/16/20/32/40 amps. And like 100 or more old circuit breakers and rcb. Aswell some mains I think, earthing 10/16 mm/ bars sockets switches and etc. I can sell...
  10. J

    Understanding breakers and RCD, un-vented cylinders

    Hi I'm a Plumber and heating engineer and a new member to your forum. I have a basic knowledge of electrics but I'm curious about how breakers and Rcd's work and whether they prevent fires. My basic understanding is the breaker trips if more power is been drawn than is safe and an RCD...
  11. A

    Rewire and circuit breakers

    Hi guys, Hoping someone would be able to help with this one. My grans house still has the good old fuse box with fuse wire which I am aware could do with upgrading to a proper circuit breaker panel. However I have no idea on how much it would cost her and hoping someone would be able to give...
  12. stephen atherton

    Range Oven Tripping Circuit Breakers

    We just had a range oven fitted (gas on hob with two electric ovens - total power rated at 5.3Kw) so a 32Amp mcb is in the board on the dedicated cooker circuit which was there from previous cooker. When one oven is on everything works fine, but when both ovens are switched on together they trip...
  13. astormatt

    MCB or MCCB?

    Afternoon all Hopefully someone can throw some light on a small problem i have. I am currently on a job, carrying out an eicr on a building and i am confused by the ocpd feeding it...... The set up is, main cut out in the sports hall building, then there are 5 circuits fed from the 200a main...
  14. D

    1.5mm clipped to ceiling supplied on 20A breaker

    Morning fellas On job at moment. Am just looking at lighting circuits. They are supplied off 20A type C breakers run in 2.5mm to MDB's then from there each lighting circuit goes down to 1.5mm flex 5 core with 2 cores being used for dali. From what I see cable rating is 20A is a 20A breaker to...
  15. H

    2 Rcd's?

    I'm thinking of having a new fuseboard fitted. The existing one has 8 fuse in it and is boxed in. The 2 electricians who have come to quotesay i need a board with A main switch 2 Rcds and 8 circuit breakers. the board will not fit in the boxing. My friend has a board with 1Rcd and eight circuit...
  16. 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...
  17. 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
  18. 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...
  19. 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...
  20. Tim

    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