overcurrent

overcurrent

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  1. E

    an overload current is classified as an overcurrent occuring in a circuit which

    an overload current is classified as an overcurrent occuring in a circuit which is electrically sound has a fault between phase conductors has a fault between Neutral and Earth has a fault between line and earth
  2. A

    Diagnosing overcurrent error on VFD

    I have a box powering three 3-phase motors off of one 240V single phase line, NEMA 10-30. In the picture you can see a wiring diagram. The original wiring I had was one box containing all those components. It would cause over-current errors on the right-side (1 HP) VFD when I didn't have fuses...
  3. BodgeJob

    Omission of overcurrent at origin of installation?

    Hi all, My question relates to the omission of overcurrent protection (specifically overload and fault protection) at the origin of an installation. Am I right in saying that DNOs allow this for meter tails, due to the maximum length of 2 or 3m, insulated and sheathed nature of the tails and...
  4. E

    Overcurrent relay setting and position

    Good evening, I have a few questions requiring your expertise: 1) For a motor with a nameplate FLC of 44A: The overload relay trip setting should be set to 44A when connected in Delta and set to 44/(root 3)=25.4A when connected in Star. Is this statement correct? 2) Does the position...
  5. J

    Overcurrent fault tripped two MCBs

    So customer reporting she plugged in a faulty LED light and it tripped both upstairs and downstairs lighting MCBs indicating that the circuits are connected (the board has no RCDs - yet). Before I go and do a CU change to RCBOs I need to identify the source of this fault. I'm interested to hear...
  6. G

    Due to this symbol does this RCD have overcurrent protection?

    Hello, I’ve not come across this symbol on an RCD before. It is the rectangle box with a line through the middle, which means fuse. Could this mean that the RCD could be fused to 80a? If that’s the case I know it would be classed as an RCBO but definitely doesn’t look like one! If it isn’t...
  7. 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?
  8. Adam_92

    breaking capacity of overcurrent devices

    I’m wondering if someone can tell me in the OSG or regs that it has the short circuit breaking capacity of overcurrent devices someone said it was table 7.2A but can’t find it anywhere
  9. R

    Does anyone know the BS(EN) for this primary supply overcurrent protective device device

    Can anyone give me the BS no. for this please
  10. J

    Shock overcurrent ignored in recommendations?

    It is my reading that doing impedance tests we like a nice low resistance in theory overall and especially for earth , both Ze and R1 or both R1 and/or R2. This makes a high potential fault current Uo/Ze, way above the allowed fuse sizes for a light circuit or many power too. So do wires really...
  11. C

    overcurrent in dc motor

    Hi ,first time posting looking for advice on a current problem we have with a rail mounted gantry crane. 2 long travel motors ( 40hp ) were found to be beyond repair recently..we changed both and carried out a stall test ...i found the current values exceed far beyond normal working and this...
  12. P

    overcurrent protection

    hi can any one give me there view on what would be recorded in; the overcurrent protective device for the modified circuit on a domestic minor works cert ,for additional lights fed from a fused spur 3a witch is fed from the ring circuit ? would it be the 1362 fuse in the f sp or the 32 mcb at...
  13. P

    RCBO's

    Good afternoon all. Does someone know a suppler of single module double pole rbos's that have stock ? I can't believe no one manufactures such an item. Many thanks in anticipation of success.
  14. S

    Fluorescent fault overcurrent trip?

    4ft old style starter/ballast type fitting which when powered does nothing at all (not a flicker) but trips the 6A/30mA RCBO after maybe 3-5 secs. I didnt have my clamp meter with me when i went to see the fault but assume due to the time delay that its the overcurrent part of the RCBO rather...
  15. D

    Overcurrent in circuits

    Evening all...just a quick question. A customer was using a wallpaper stripper on a ring circuit, smoke started coming out of the back of the socket before the 32amp breaker tripped, what I don't understand is why the 13amp fuse in the plug didn't break? Could someone tell me why? Thanks
  16. M

    overcurrent protection question

    Hi all, I'm fairly new to all this so bear with me if it's a ridiculous question... In my text book that I'm studying for my course (c&g 2365) it has symbols that you use to define whether the protective device will work for a given circuit (I think? please correct me if I'm wrong). The...
  17. M

    16A socket on a radial require 20A Overcurrent device, where's the reg?

    Hi all, I hope this is the right place to post this question. I'm revising for my 17th edition exam tonight, I qualified on the 15th edition too long ago to mention, and my on site guide says in section H3 that radial final circuits using 16A sockets complying with BS EN 60309-2 should be...
  18. G

    Current sensing switches

    Hi Can anybody point me in the direction of a UK supplier foe these or equal? AS1 Series Current Sensing Switch | NK Technologies - San Jose, CA 95136 thanks,
  19. M

    primary overcurrent protective device.

    Morning all Eicr asks for characteristics of primary overcurrent protective device which lets be honest sounds straight forward but what if you have 3 phases with 3 separate 300 amp 1361 which supplies a load of other 80 amp 1361 fuses which then supplies your single or 3 phase db which fuse...
  20. G

    Bi Callender Overcurrent Protective Device

    Anyone know if a Bi Callender Primary Supply Overcurrent Protective Device is BS 1361. All it says on the unit is Bi Callender (which i have looked up and is the manufacturer, and i cant find anything else on it). Don't know what to put on Electrical Installation Cert which is to be inspected...

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