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  1. HoverSPRX

    Commercial Max Demand/Diversity Query

    Hello All, Iv been asked to pick up the remedials on someone else's EICR that was done last year on a school for Deaf Children. One of the items listed on the report is the conductors leading to the sub mains from the main panel are undersized. I popped the cover off to have a look and sure...
  2. Empire

    Crabtree f-60 tp&n circuit breaker bs# and short circuit capacity

    Morning All, Having spent many years gleaning information from you all as a non member I've finally needed to join because, try as I might, I just can't find the answer to this puzzle, so here goes. I've just installed, replaced really, a TP sub board that's being fed from a Crabtree 60A STD...
  3. M

    Increasing 3PH Supply?

    A company i do work for are running over the capacity of their existing 100A 3PH supply, they are pulling around 100-120A all day long. I am trying to get them to get a bigger supply, they have tried asking for a 250A supply from the DNO, but they want £20K. (they reckon the transformer would...
  4. Y

    Maximum Current Capacity

    How much current capacity can handle in a 16 sq. Mm. Wire size in ac 415 volt supply? Because i have 2 pump motors that will connect to a power source of 415 volts ac 3 phase; 1 motor is 5.5kilowatts and another one is 7.5kilowatts. Both motors will run intermittently and supplying different...
  5. Rick Ellmore

    Trunking, Ducting capacity

    Hi Guys and Gals, I'm looking for some help, I am looking to find some info on cable carrying capacity of conduit, trunking and ducting in accordance with the IEE Wiring Regulations for my NVQ but I cant seem to find the info in the BS7671 or the OSG? anyone have an idea where to look?
  6. U

    DEWALT Flexvolt 18v-54v batteries

    Been looking into these batteries from dewalt standard 18v battery but has an output equivalent to 54v. Bloody expensive but they look like they will last ages and produce some serious output...
  7. C

    3 phase upgrade

    I currently have a 100amp 3 phase supply. I would like to put in a >300amp supply. excluding the eclectical work past the Cut out. can some one please tell me the approx price on an upgrade? thanks
  8. C

    Replacement panels for a defunct manufacturer

    Afternoon all We have a couple of damaged Day4Energy 240w modules to replace and so far as I can tell this company no-longer exists. Well not in the same form as it did a few years ago anyway. A new company has taken up the technology but are not producing these panels. They have suggested...
  9. K

    factory rewire help

    hi everyone im currently looking at updating a board in a factory with bs88 fuses in it can anyone reccommend a board and overcurrent protective devices that would be a more suitable replacement? the out going circuits are ok and up to date thanks
  10. S

    Commercial Emergency Lighting Central battery system design

    Hi All, I am new to this site so be gentle please.... My question is this... I have been to an existing job which has 55 slave EMLs throughout the building. We are experiencing volt drop on the longer routes with the LED fitting, approx 40 lights. The LED fittings start to strobe as they hit...
  11. K

    Relationship between Cut-Out Fuse & MCB PSCC

    Good morning all, Apologies if you have gone over this a number of times before (I have tried searching for a thread, and have found some that have touched on what I'm after but not quite explicitly enough). If the measured PFC is greater than 6ka (for example) with circuit-breakers' breaking...
  12. R

    fuse rating or setting

    Ive searched but cant find any info on the following- On the certs forms under main switch or circuit breaker it asks Fuse /device rating or setting??:santa_cheesy:
  13. S

    cable in conduit

    How many 4mm can you put down a 20mm conduit???
  14. A

    BS 3036 fuses on Ring Main.

    Hi, I am looking for a bit of advice on the Regs relating to BS 3036 fuses on a ring main, as I do not agree with the comments made on a PIR. The defect states that the conductors are too small for the protective device due to the 0.725 factor. The circuit is wired in 2.5mm2 singles in...
  15. S

    EPC, DNC and MCS - TLA headache!

    I have just had a call from our EPC assessor who has had notification from his accrediting body that they are unable to accept the MCS cert as proof of size of installation (in the case of EPC being done after the install because without it the house would not get a D) because it shows the...
  16. S


    what is allowed to be tested or can not be tested on the dno side of a domestic property?
  17. M

    how can i take breaker ics rating?

    hi i wanna know that what is the abbreviation of ics and icu? and how can i take my ics rating of the breaker? is there any formula or calcualtion? and i wanna know short circuit rating ics of single pole and tripple breaker ? how can i take it?
  18. S

    mcs certificate

    Delivered a certificate the other day and cant believe I put wrong Net capacity it should have been 3.68 and not 368kW! How do you change this and is there a cost? Cheers
  19. N

    Commercial 32A ring circuits wired in 1.5mm firetuf

    I've been asked to inspect a shop and have found 4x 32 amp ring final circuits supplying socket outlets, all wired in firetuf 1.5mm twin and earth. Actually all the circuits are wired in this stuff, there must have been a deal on at the wholesalers.. My concern is does this comply with 421.1.103...
  20. P

    How to work out TIC!!!

    Hi Given that... Total Installed Capacity (TIC) is the maximum capacity at which an Eligible Installation could be operated for a sustained period without causing damage to it (assuming the Eligible Low-carbon Energy Source was available to it without interruption), a declaration of which is...
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