mccb

mccb

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  1. P

    MCCB panel selection

    We are looking for a distribution board to provide 3 * 160A three-phase feeds, but they are basically redundant supply path options so max total is 160A as well. I had been looking at using a Hager MCCB panel (as we generally have been using their MCB DBs) but many of them are limited to 125A...
  2. MaintenanceSpark

    Max Zs for Bill Talisman MCCB

    Hi everyone, Happy Friday! Could someone please point me in the right direction, I’m after the Max Zs for a Bill Talisman TLF633 63A MCCB, I’ve looked in the BBB but to no avail on the Max Zs tables. I’ve also looked on our Cert software as they have a Max Zs app but the MCCB category doesn’t...
  3. MaintenanceSpark

    Max Zs Bill Talisman MCCB

    Hi everyone, Happy Friday! Could someone please point me in the right direction, I’m after the Max Zs for a Bill Talisman TLF633 63A MCCB, I’ve looked in the BBB but to no avail on the Max Zs tables. I’ve also looked on our Cert software as they have a Max Zs app but the MCCB category doesn’t...
  4. F

    BS number/ Zs MCCB help?

    Hi, Can anyone tell me a BS number for a merlin gerin compact C161N? Also does anyone have max Zs available for the same C161N 63a MCCB? Cheers.
  5. R

    MCCB Adjustable trip setting - cable rating

    Hi all, In general do you size the cable to the MCCB full trip setting rather than the adjustable setting for the load being supplied. In some cases upsizing the cable can be costly even from 320/400. One of the site engineers is adamant that it should be sized for full trip setting. I'm not...
  6. Q

    Merlin Gerin MCCB Zs Values

    Hi All, We have a Merlin Gerin Compact NS100N Single Phase MCCB I've been asked to find its Max ZS Values and to be honest I cant find anything! This is an from an old MCCB board we are re testing. I put it in google and cant seem to find anything, I know Schneider bought this brand out. But...
  7. Q

    Transformer and MCCB Questions

    Hello All. New here and will be flooding with terrible questions for my own knowledge. Just trying to learn so some questions like this maybe very simple and I'm just daft 1) On site we have a Aux Transformer, From the LV side of the transformer we have an MCCB Board with a few circuits. Now on...
  8. D

    RCCB Tripping, after some reno work

    Hi guys. Looking for some advice. I’ve had some building work done. 1. Outhouse. The wiring internally was changed but the wiring from the house to the outhouse is the same. All electrics working okay in there. 2. Conservatory built. Wiring is in however it is not connected up yet so no...
  9. P

    merlin MCCB service/test

    Hi I have a client with a 1000a merlin mccb as their incoming PD from their private transformer. Previous maintenance spark has claimed its faulty and trips under no load, so they’re leaving the compressors running 24/7, I find this odd but don’t want to mess around too much as if something...
  10. D

    I am looking to buy used and surplus MCCBs

    I am are looking to purchase used and surplus 3 Phase MCCBs and single Phase high amperage MCCBs. All brands considered as long as the MCCBs are in full working order. If you have any that fit that description that you would like sell, please drop me a DM. Thanks
  11. C

    Electrician Jobs Supply to flats using Ryefield boards or mccb panel

    Hi all We are doing wiring to 6 flats.DNO will provide 200 amps service head on ground floor.All Swas for flat submains come to the intake area on ground floor. What is the best option for termibating those SWAs into individual switch fuses after Ryefield board or can i use MCCB panel.Do the...
  12. michaelw6

    commercial industrial zs mccb 3phase question TN-C-S.

    Im specking a large 480a cable over 160m ive done cable calcs and come up with 2x 120mm 70c armored. now Im trying to work out my max zs...with no avail. my main ze is 0.17 but my mccb is saying max zs of 0.054 and my mccb will not trip... why is it so low? its impossible to get my zs less than...
  13. B

    Zs to high on MCCB Protected circuit?

    Hello to the experts of the forum! I am currently checking an installation and the measured r1+r2 of the cable (4c 70mm swa of 550mtrs) is 0.8Ohms using the armourings as the cpc. Ive checked with schneider and the max Zs is 0.38 Ohms (5s disconnection time). This installation is new and i'm...
  14. G

    Mccb

    Anyone know the make and type of these mccbs. 4752?. could be early crabtree?
  15. V

    Max Zs MCCB

    Hi all was just looking to know does anyone know the max Zs for a 250-400 amp MCCB I can't find it anywhere in BS7671
  16. P

    100 A MCCB feeding DB with various RCBO's tripping before they do?

    Hi I have a problem on a site that I have inherited. The fault is that a 100A MCCB is tripping indeterminately. The MCCB feeds a DB which has several cct’s none any higher than 32A and all cct’s are RCBO’s the RCBO’s are not tripping yet the MCCB is. The MCCB has been changed recently...
  17. F

    Static generator Mccb

    Hi guys, my head has gone blank. I have a generating set 400v 345a flc what is the max distance the Mccb can be from the generator stator lugs. i seem to remember 3 mtrs but something in my mind Is telling me it can be greater under certain rules. many thanks
  18. D

    Installing a 200a MCCB in a proteus 3phase board.

    Hi everyone, I'm a newly qualified electrician and im working for a company that have asked to the fit a mccb, my boss sent me this email today and im not completely sure what he means, any help would be great as I really dont want to call him tomorrow asking how to install it. Any help would...
  19. R

    Mccb rating

    Regarding mcb and mccb What is the lowest rating of mccb available
  20. F

    MCCB Boards

    Hi people, Could one of you lovely people tell me the maximum cable size that you can fit in a three phase new style wylex circuit breaker. I have a board to change that contains a couple of 16mm 25mm cables but also one 50mm and the main incomer is 50mm also! What are people using with...

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