overcurrent | Page 2

overcurrent

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  1. 1

    How old is this overcurrent protective device please?

    Never seen one of these before but I'm sure plenty of you guys have. Please could someone be kind enough to tell me more about it:thumbsup Would this be part of the distributors equipment or the consumers? Many Thanks in advance
  2. P

    Overcurrent protection on PV

    Hi all, Quick question for everyone. Having had an electrical contractor carry out some of our installs in the busy period, something has arisen that I am unsure about. For a commerical install we have x amount of inverters feeding a PV DB, then one outgoing cable to feed back into the...
  3. J

    busbars and upstream overcurrent protection

    Hey all Want to gain some opinions on busbars and upstream protection. situation: 3phase busbar chamber, fed from a switch fuse on a rising busbar system. I'm unable to turn off the switch fuse to see what size fuses are installed as it would kill everything on the busbar chamber, but there's...
  4. S

    overcurrent device

    on the schedule of test results, what is the kA overcurrent device short circuit capacity? Is it 33.0 kA as the installation is protected by a bs1361 type II fuse in the main cutout?
  5. Goody

    Choosing an overcurrent protective device.

    Where an overcurrent protective device is used the following condition shall be fulfilled: Zs x Ia < or = Uo Ia is the current in amperes (A) causing the automatic operation of the disconnecting device… Can I assume Ia is the “PFC”? Thanks
  6. S

    minor works cert help

    hi there i am filling in a minor works cert and in part 2 it asks for 'overcurrent protective device for the modified circuit' and 'residual current device'. i have a split load board with one rcd on it. the work has been carried out on a ring circuit on the rcd side so i assume i put in the rcd...
  7. B

    MCCB vs HRC overcurrent protection

    Have been looking at a situation where a 400 amp MCCB is feeding a ups. There is a mains supply to a genny changeover switch, along with the genny supply, and the MCCB is between the genny switch and the UPS. Yes its a big bu##er. Any ways there was a momentary power fluctuation which threw...
  8. S

    Lutron rania dimmer problem

    I've been asked by a customer to look at a lutron rania dimmer. The problem is when switched on the lights flash light a strobe light all over the room. Spoke to lutron they believe that it overcurrent so I split the room lighting and still have same problem. Anyone come across this before...
  9. cbw

    Earth Overcurrent Protection

    Well thats a first for me. 5 amp fuse holder with what can only be described as a nail for fuse wire into A 40Amp 30ma rcd with A C32 MCB for the main earth (SWITCHED OFF!!!!!) then off to The main fuseboard. Does "live cables" count as labelling of conductors??? It was either...
  10. C

    Form 4 - Overcurrent Device - What to put down

    Hi On the form 4 - in the brb - in the box entitled: Overcurrent Device 4 Short-Circuit Capacity: ........kA What is that referring to? Is it the RCD in the cu? Just wondering as this box is above the sub headings of type and rating - which I know are for the circuits individual...
  11. La Poste

    RCCD's and RCBO's

    This might sound like an obvious question but do rccd's have overcurrent protection? When you buy a 17th edition board that has two double pole RCCD's one at 63A and one at 80A are these RCCD's effective for overcurrent as well as earth fault leakage? I have been looking at double pole RCBO's...
  12. J

    a KMF switch (isolator) problems please help !

    Hi I am unsure on the regs with this I have a 100a main fuse but need to run tails outside in armoured cable into loft of extension I know that I need a kmf switch but I'm struggling to find a small 100 amp one (not enough room for the big wylex ones) can I use a Switch Fuse Moulded Single...
  13. Amp David

    Charactaristics of Primary Supply Overcurrent Protective Device

    With a 2 way CU that is fed from a 32 amp MCB, when it comes to filling in an EIC, in the 'Charactaristics of Primary Supply Overcurrent Protective Device' part of the cert, is this the 32 amp MCB, or the main service fuse at the house end. Thanks in advance chaps.
  14. S

    Primary supply overcurrent protective Device

    While completing the Elecsa certificate, it asked for the nominal current rating and short-circuit capacity of the primary supply overcurrent protective device. The system is a TNC-S and there is nothing written on the fuse at all to say what rating it is. Also it is riveted and it cannot be...
  15. T

    51 & 49 function relay

    Hi all New to the forum, can everyone help me to explain the difference between 51 and 49 function relay incase motor protection. Thank you
  16. S

    offline overcurrent protection

    What is offline overcurrent protection for synchronous generators? How it works?
  17. B

    overcurrent protection

    come across a 32A circuit feeding 4 x 100w lamps fed via 6.00mm swa but at far end lighting is conected via 1.5mm flex .so in theory this cant over load 1.5 flex earth loop of .78 so can this be accipted as earth loop will clear fault under fault just as a 2.5mm t+e can be protected by a 32A...
  18. K

    Short circuit capacity???????

    How do you work out the overcurrent devices short circuit capacity in KA, i thought it was just written on it, if you can't find it what do you do then? HELP!!!!!!!!!

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