circuit protection

circuit protection

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  1. E

    Fusing downstream with very short cable length

    Hi, first post newbie here. I have a question relating to what I am told is a grey area in both 7671 and low voltage assemblies regs. I have a customer with some LV industrial control panels, 100A fused isolator with 25mm main singles from isolator down to motor drive, but off the isolator...
  2. T

    UK Change in current capacity along run

    Hi, I have a book on domestic wiring which says that everywhere there is a change in current carrying capacity along a circuit there must be some kind of protection (fused spur etc). Suppose I need to run above an insulated ceiling (reference method 101) and then down a wall (reference method...
  3. P

    Short circuiting dough mixer

    Hi, I’ve got a brand new dough mixer which won’t work. Out of the box it just popped when switched on and tripped the power in my shop. Using a voltage pen I’ve detected that there’s power getting into the circuit board but not out. Noticed the fuse in the board was gone so replaced it and when...
  4. Daniel DD

    Surge Arrester Installation and External Short Circuit Protection Device

    BACKGROUND I live in a small town where it is difficult to find ceritified electricians. In fact, electrician certification is not common for residential installations. I did find some experienced electricians but I don't think they are certified and know best practices in the installation. I...
  5. A

    GFCI circuit protection when replacing old non grounded receptacles

    Hi All, I’m a retired electrician from the Detroit area. My question is, I need to replace some old two prong receptacles in my daughters 75 year old home. Code says I can install a GFCI receptacle in the first receptacle of a group of receptacles and install standard three prong receptacles...
  6. cliffed

    Short circuit protection on high resistance on live conductors

    Thoughts on this scenario,obviously a short circuit fault situation
  7. G

    Cooker connection

    Hi I’m in the middle of installing a 2500kw cooker, I have an existing cooker circuit with 6mm cable on a 32Amp breaker with a spur coming of the cooker switch to a double socket which I assume fed the old cooker on a plug top! My question is: Can I replace the double socket with an terminal...
  8. L

    Final Circuit Protection

    Hi Everybody Why fuse is no longer use in Final Circuit Protection. Instead, Circuit breakers are used. So far, I know that CB is more sensitive than fuse. Can someone depicts any reason and their respective curves. Thanks
  9. 6

    Circuit protection advice

    Hi everyone - I am new to the forum , I'm hoping I have come to the correct place to post! I am not an electrician, I have reasonable electrical understanding and know how circuits like ring/radials work,how consumer units protect the circuit etc but little more..... Recently our drying...
  10. P

    Marbo circuit protection?

    I have just visited an installation covered by a Marbo split load board which needs work before any alteration is carried out, does anyone know where i can get Marbo RCDs / RCBOs or know of a suitable alternative that will fit? Cheers guys
  11. H

    problem of circuit protection

    Hello, after shutdown of power supply ,at the next time of start, my water pump it is breakdown. I think my circuit protection is not approperiate, because it is the second breakdown !! please,how to protect my installation correctly. thank you
  12. P

    Distribution circuit protection

    Hi all I am planning a CU change for assessment. My detached garage is currently fed from a 16a MCB in my CU. The garage CU has RCD protection for sockets and lights. My question: Can I run the SWA from an unprotected way in the house CU (as it is now) so that I don't have to consider...
  13. D

    FCUs as circuit protection for part of circuit

    I'm sure we've all come across these scenarios: 16A supply to garage from consumer unit to a socket and an FCU feeding the lights with a 5A BS1362 fuse. 32A ringmain extended to feed conservatory with FCU with 3A BS1362 fuse feeding garden/patio lighting. Central heating supply from...
  14. G

    Best practice for submain circuit protection

    I am currently changing an old consumer unit for a new RCD protected split board. One of the circuits is a 6mm submain circuit protected by a 32A MCB that exits the house, crosses the court yard via a catenary wire, and enters the garage 4 way RCD protected board. Is it ok to put this circuit...

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