mcbs

  1. vini

    24 module DB to include 16 MCBs

    I am looking for a 24 module DB to include isolator, 16 MCBs, 2 RCDs and a SPD. So far all I have seen is an Excel board, which I have never used. I tend to use BG boards. Has anyone used these boards? and what are your thoughts? Area there other boards available? I have to admit my search was...
  2. D

    Square D QL 2 board with the lighting circuits from two MCBs replace them with single pole RCBOs?

    Would this be Compliant, safe, on a TT earthing system with an upfront S-type RCD
  3. O

    Sequencing of RCDs and MCBs

    Hello sparkles, I have a question in relation to sequencing the RCDs and MCBs in the CU. I called an electrician to come to my house and upgrade the CU. Because it was hard to re-arrange the sequencing, an additional RCD was installed and the corresponding new MCB after it, but one old MCB is...
  4. V

    combi microwave 2900w on switch fuse or 16a supply?

    when installing circuits protected my mcb's , i have always used the 80% rule. eg a lighting circuits where the load won't exceed 80% of the mcb rating. i have a combi microwave. max 2900 watts . 2900/230 = 12.6 Amps. does 80% apply to cartridge fuses? i guess this could be classed as a...
  5. L

    Breaking capacity of MCBs

    Hi all, I have a question regarding the breaking capacity of circuit protective devices. So, the breaking capacity rating of devices in domestic / 230v tends to be 6ka, and for commercial / 3 phase it tends to be 10ka. Say the PFC at the origin was greater than the rating on the MCBs, and the...
  6. I

    Adding RCD protection to obsolete MCBs

    Best way to add RCD protection to specific circuits in an old Siemens DB which I’m told is now obsolete. Install an additional enclosure adjacent to the DB to hold new RCBOs and feed these from the obsolete MCBs? Any other ideas?
  7. J

    MCBs ADS in TT system

    Quick Question. Despite being 50 I am a newbie electrical installer. Preparing for my retirement from public service. Anyways - my Question. How the hell do MCBs work on a TT system. Say Ze is 33 Ohms with a 240 supply the PFC will be just over 7 Amps. How does that trip MCBs or is there were...
  8. L

    MCBs tripping randomly?

    Hi all, So I’ve been having a strange fault in my house which has just appeared over the past few days. About a month ago I moved my pc set up into the sun house to make space for my second kid. Inside the sun house/garage I have a DB that is fed of a 40A type B breaker fed by a 6mm core...
  9. Dartlec

    B3 MCBs in domestic installation

    Going to fit an 'boiling' tap for a plumber next week so asked for a pic of the CU and got this: which is all rather odd. Doesn't affect what I want to do, but the first time I've been B3 MCBs being used and can't think of any reason why someone would choose them over the standard B6 The...
  10. J

    Main MCBs replacing incommer switches

    In this Youtube vid it shows an electrical CU on the French/Italian border. One comment says it was done to Italians ways. One comment say it is normal to have 30A supplies, as was this. They install 30A DP MCBs as the main incommer switch, so as not to blow the main fuse. Sounds a good idea...
  11. B

    Problems with Axiom MCBs

    Hi, does anybody know what other brands of MCB (if any) will fit an axiom consumer unit? I need a C32 breaker but i cannot source axiom C curve breakers anywhere. The initial problem is my Plasma cutter trips the B32 breaker as soon as I touch the trigger, and i cant think what else the problem...
  12. M

    Consumer Unit MCBs

    Hi Everyone, I’m new to the forum and joined to gain more knowledge from you guys that are practicing electrical work. I studied 17th edition electrics at college a few years back and passed with great scores but never went on to use my electrical qualification in practice, I used my cabling...
  13. R

    RCCB tripping but no MCBs have tripped.

    I’ve a Square D Split load RCCB board that has a strange issue. The RCCB trips and none of the MCBs seem to trip. The only thing that has recently been done is replacing the sockets and switches. I’ve tested each socket with a socket tester and it was showing as correct on all sockets. I only...
  14. R

    UK Mcbs

    Hi all. I have a question if I may. I will not be doing this myself. Just enquiring before I find a sparky in my area. I have a small CU in one of my sheds on a 40a rcd with 2 mcbs 32a and 6a. The 32a runs my pond. Just pump and filter. Can I have 2 16a mcbs instead. One for pond. One for double...
  15. naylorpd

    Wylex push button MCBs

    Not sure if I'm allowed to do this... Having a clear-out, 7 Wylex MCBs from my old DB gone to fleabay: http://ebay.us/8HGCwV?cmpnId=5338273189
  16. N

    When working on circuits do you isolate whole board or just the final circuits using MCBs ?

    When working on circuits do you isolate whole board or just the final circuits using MCBs ? Or is there any instances when the whole board has to be isolated even if you are working on few final circuits? Thanks.
  17. M

    MCBs Polarity ?

    Quick question Am I right in thinking that all standard SP MCBs are non -polarized ie: supply can enter top or bottom of unless they're marked with line/load markings Also the 1 and 2 markings on MCBs ,what does that indicate ?
  18. C

    Time Current Curves of Various MCBs and MCCBs

    Does anyone have a link to various time current curves relevant to UK MCBs and MCCBs in the 16-1,200 amp range? Specifically, how many times the handle rating does it take for each to trip at 10, 5 and 1 second.
  19. T

    Heads up faulty pro-tek mcbs

    Not sure how wide-spread this is but undertaking an EICR on a unit comprising 4 pro-tek MCBs the other day, 3 of them refused to re-energise, felt like mechanical failure, 32 and 16amps, model with a large blue lever.
  20. C

    Chint MCBs

    What do others think of these MCBs? Are they real? I'm seeing them on Amazon at questionably low prices.

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