mccb

  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. 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.
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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
  10. C

    MCCB used as a final circuit supply

    Currently pricing a 250a Power upgrade for a small warehouse, the new 6 way 250a MCCB panel will essentially be used to supply x2 fuseboards however i want to have the MCCB panel also supply the larger plant as i want the MCCB panel to take the heavy loads as the client said he will never be...
  11. A

    Does anyone have a dorman Smith yb3 frame mccb

    Hi was wondering if anybody here has a dorman Smith loadline yb3 frame mccb in the Somerset region, if not would anybody know what other make I could temporarily use while I wait for the dorman Smith container to reach British soil?
  12. K

    MCCB Zs

    Got a Ze of 0.6 ohm on a TN-S. Circuit protected by a 250 amp mccb with an operating Zs of 0.073 ohms. Any ideas what I can do? Any advise much appreciated.
  13. P

    Another video on fuses versus MCCB

    While idle on YouTube I saw this video showing the comparison of HRC fuse and MCCB with some spectacular results at high (63kA!) but in-specification faults:
  14. cliffed

    Mccb tripped

    Simple question but maybe harder to explain. Whats you take on resetting a Mccb say 100 amps 3p@ Main panel board. You’ve been called Out to a DB TPN, that’s got no voltage to it,you look inside DB,seems ok,& by experience you can see a reason why this happened. You find the MCCB & reset,go...
  15. A

    sharing one MCCB for 2 loads

    Happy new year everyone! During one my my inspections in an existing warehouse, I saw their electrician has pulled a wire from the incomer side of an existing panel ( panel A, 3 pole isolator as an incomer), to feed another e phase panel(panel B). The upstream breaker is an MCCB ( in panel C)...
  16. S

    Dorman Smith Loadline MCCB Y7 1250A 3P

    Hi guys Just wondering if anyone would be interested in purchasing a brand new Dorman Smith Loadline Y7 Electronic ICU 65kA mccb? It was intended to be supplied to a rig in Aberdeen along with some other smaller mccb's (already moved on). Anyway job was cancelled and let with this unit. If...
  17. B

    Smaller MCCB feeding larger MCCB-RCCB

    Anything wrong with this? 125Amp 4 pole MCCB from panel fed to new panel with 150mm 4 core ALI then in that new panel 250Amp MCCB/RCCB then all sub circuits?
  18. B

    MCCB with RCD settings

    MCCB with RCD bolt on, anyone know how to work these settings out? Ignore settings now but this is upfront RCD TT system so I want to top one to be 0.3 for 300mA but unsure on bottom?
  19. Ian1981

    Mccb used as main switch isolator

    A question regarding the use of a mccb as a 3 phase main isolation switch to a DB. Is it a necessity? Current set up is I have a 3 phase 70mm supply feeding a DB. The origin of this supply is unknown, hence I’m getting northern power out to investigate as the main cut out earthing arrangement...
  20. M

    60947-2 mccb maximum zs

    Can't find any data on these mccb if anyone has the ia for 60a,62a,80a,125a or 250a please post . Pete 999 am looking at you
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