max

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  1. Pretty Mouth

    Max circuit length for LEDs powered by constant current driver.

    Hi all. Constant current LED lighting is a new concept to me. Not that difficult to get the head around, but I cannot find an answer to the following question: How do I determine the maximum length of a ELV LED lighting circuit powered by a constant current driver? For a constant voltage ELV...
  2. P

    Relay switching max voltage across contacts

    Thought i would put this out there for any experience faced with this design issue. TP Immersion heater 11KW, has built in contactor, coil voltage 400V I want to bring in the immersion heater via control system and ideally not alter the immersion heater package. The control system can operate a...
  3. N

    How are max circuit lengths calculated in table 7.1

    Something I'm not quite getting. In table 7.1(i) of onsite guide the max circuit length of (for example) a lighting circuit on 6 amps, with rcbo and wired in 1.5mm is 106 meters. Where does this 106 meters come from because if max volt drop allowed is only 3% for lighting, 106m works out to 8%...
  4. N

    Max volt drop for 25mm or 35mm feed to sub CU

    How does max volt drop for 25mm or 35mm feeds to sub CU work. Do we for example allow only 1% drop on the 25/35mm so we can keep 2% drop for lighting circuits and 4% for power circuits, or is there any where else in the regs that gives specific figures on maximum allowed volt drop? Any...
  5. D

    Max zs values

    Hey all im just trying to learn max zs values from a NICEIC chart i have, now learning these values isnt a problem but the sections reffering to bs3036 fuses and type D mcbs both have two lists of readings - one each for 0.4s and 5s trip times - where as the sections for type B and C only have...
  6. Q

    Max continuity reading for bonding

    Good evening I was always taught the gas and water bonds should have a continuity ideally with a maximum of 0.05 ohms, is this a exact maximum or a rule of thumb and if it was higher than this what coding would we give it? I had a look through the codebreakers booklet but could not bit see an...
  7. B

    Max Tripping Time

    Would anyone know the max tripping time for this earth leakage device? I’m guessing 500ms it’s time delayed but I know that figure is for RCDs and RCBOs, I tested it at 560ms Thanks
  8. Mark Wright

    Max Earth Fault Loop Impedance for OverCurrent Devices Before Amendment 3 and Now???

    Maximum Earth Fault Loop Impedance for OverCurrent Device was calculated 230/(MCB Rating*5) * Rule of Thumb is that correct? And how are they worked out now after Amendment 3?
    • Mark Wright
    • Thread
    • amendment before devices earth earth fault loop impedance fault impedance loop loop impedance max overcurrent
    • Replies: 5
    • Forum: UK Electrical Forum
  9. D

    18th edition RCD max disconnection times!!

    Hi all. I am seeing different figures here all over the net, table3a (p363) states a 30ma RCD has a trip time of 300ms max. So at 5x is the maximum 60ms? I seem to recall 200ms and 40ms for a 30ma and these are the figures I am seeing over the net... Please I just want the correct figures for...
  10. Baddegg

    Max permitted Zs values...

    Anyone know where I can find max Zs values for these?.....and the 6a LN 5906....
  11. C

    MAX Zs with 61009

    Why do we have maxuim Zs for 61009 RCBO's? I didn't think Zs values really mattered if the circuit was covered by and 30mA RCBO/RCD?
  12. stuarth

    Max demand & diversity advice needed

    I have been asked to do some work on a large 25 room mini mansion spread over 3 old properties made in to 1 with 6 consumer units on a single phase 100amp supply. The total loading of the breakers is 452 amps if I apply diversity at 40% I arrive at 180.8amps demand but this dose not take in to...
  13. B

    Max Zs TN system can’t achieve

    Sorry further on from last post, TNS system, Zs can’t be achieved on final circuits, getting 1.08 Zs on a B63 0.69 but protected by 167 ohms, poor design cable runs are too long and R1+R2 proves this, now I’ve spoke with my boss about what to record in Max Zs is it 0.69 or 167 ohms as all...
  14. E

    Output Max Amps

    What output current will I get if I have an input voltage of 700 volts at 1 amps and if I step the voltage down to 230 volts what would be the max amps I'll get.
  15. B

    TNS system Max Zs exceeded

    Local caravan site, 16/2C swa out have 3 or 4 Electric points with 2 x 16amp sockets on one circuit protected by B63 MCB now, TNS system Main RCD 100/300 mA protecting MCBs, now I’m testing and getting Max Zs of 0.99 when permitted is 0.69 so pointlet de rating to 50 amp, I don’t like the idea...
  16. S

    Doorbells again - volt drop / max bell wire length

    Hi Folks I've been trying to work out whether a doorbell will work with approximately 16m run of bell wire. I've tried to find out volt drop, resistance (to calculate volt drop), or even CSA of typical bell wire. But no luck. I tested an approx. 3m length with my MFT and got 0.87 Ohms. That...
  17. D

    Max Zs /ADS / shared CPC & N

    Hey Everyone. Whats your thoughts on using a 3core & earth to run x 2 final circuits? I have x1 three core & earth feeding contactors for emergency lighting. L1- fed from a 6A mcb is feeding a switched pole on a NO contactor, L2- fed from a different 6A mcb also feeding a pole on a NO...
  18. B

    40 amp max pole?

    I am looking to add a 240v 50 amp circuit breaker to this panel for a welder. But (in the top left of the pic) is says that it is 40 amp max pole. Am correct to think this means i can only add a 40amp 240 volt circuit breaker?
  19. buzzlightyear

    need max for old mcb

    any body got the max ohms for old dorma smith mcbs , I asked dorma smith years ago sent me max ohms for old load masters .
  20. A

    Max Zs value for MCCBs

    Hi Guys, in an installation with one main Distribution board and several submain-DBs, do when you measure Zdb on a submain-DB incomer? and do we need to verify the Zdb value with the upstream protection device?( for example, a 250A, MCCB on the MDB outgoing). If yes, how can I get the max Zs...

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