protection

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  1. R

    Does a ring with RCB protection need a designated earth or can it terminate through the conduit?

    Hello I am adding a couple of sockets to an old industrial installation. I am replacing the existing sockets and adding two more into the ring. The installation is earthed through the metal conduit and an RCB has been retrofitted to the circuit after the old style fuse board. Is it...
  2. 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...
    • Daniel DD
    • Thread
    • circuit circuit protection device external installation protection short short circuit spd consumer unit surge surge protection voltage drop
    • Replies: 1
    • Forum: DIY Electrical Advice
  3. BiddeldyBwah

    Do 3 phase boards usually have RCD protection in commercial settings?

    Just sat contemplating life and realised i don't think i've ever seen any RCD protection on the boards we maintain/install at work. I've seen 300mA protection on some section boards but don't recall ever clocking a 30mA in a 3 phase board. Am i just not looking properly?
  4. 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...
    • acxman
    • Thread
    • circuit circuit protection gfci old protection replacing screwfix
    • Replies: 6
    • Forum: UK Electrical Forum
  5. P

    Electric heater & frost/damp protection

    At some point in the next several months I need to look at heating for an "anti-vandal site office" used as store and occasional workshop, 3m x 10m floor, around 2.5m internal height. It needs some protection against frost and damp when not in use, as well as some comfort heating when used in...
  6. B

    Solar Flexible steel conduit as mechanical protection

    Hello I’m new to the forum (posting on it anyway). I could do with some advice... Over the last 2 years I have been subcontracted (labour only) to commission solar PV systems. Often these are newbuild properties and when I get there the panels are already on and the DC cabling done. About...
  7. sajeel

    Best electric wiring protection

    Hi Wanted your opinion on best rodent protection see picture attached So far the ones I have looked at are (1) 3/8" FLEXO RODENT RESISTANT (RRN) (2) Flexicon galvanised steel flexible conduit (3) Adaptaflex Nylon conduit. 1) Flexo® Rodent Resistant - 3/8" -...
  8. B

    Does this need more protection?

    OK.. I have a faulty RCD to replace as seen on the photo. It feeds a 32amp ring circuit, in a commercial premises on a 'TT' supply. Ze=37.6, 0.63kA. Looking at the photo you may notice a few strange things about the two RCD's? Would I need to add in some extra form of protection before these...
  9. Y

    Unsatisfactory EICR - No RCD Protection

    Hi, I have an Unsatisfactory EICR with the following observations. The flat block was built in 1930 (Art deco) and it was refurbished in 2010 ( I suppose some rewiring was done) Contacted the inspector who charged 104 pounds for one bed in London and the report comes back unsatisfactory mainly...
  10. S

    Separate Arc fault protection devices not needed with RCD's?

    I'm looking at replacing my old switchboard with a new RCD/AFCI one. I asked the electrician who was quoting the job about Arc fault interrupters. I previously understood these were a different device from RCD's-RCD is to prevent shocks, AFI to prevent fires. I also understood there were devices...
  11. G

    EV chargers and RCD protection

    Hi all, just having a read through the regs and code of practice on car chargers. Where it stipulates the use of RCD's "for charging points" eg 722.531.3.1, is that referring specifically to the charge point it's self, ( and the fact that protection may be contained with the unit) rather than...
  12. lozarus

    Fixed Appliance RCD Protection

    Afternoon - despite a recent 18th edition pass (all but one right!) I'm having a bit of a moment whilst planning some upcoming works at our site. In reality I should wait, go home, refer to the big book and go from there. But it's playing on my mind and I can be a bit impatient. Also, I guess...
  13. N

    Rcd protection

    Ringmain fed by 32A mcb on split board protected by rcd,I'm spurring of ring feeding a underfloor heating system rated at 9A ,I know I can fit a d/p 13a fcu,but do you think its overkill if I fit a d/p 13A rcd fused spur so the heating system has it's own rcd protection ,so it will switch off on...
  14. A

    New garden shed supply and garden sockets RCD protection?

    Hi, I need some advice on a garden supply project. An existing small garden shed is being replaced which had a supply to it for a light and two sockets , and a radial socket circuit which continued around the garden. The old installation had a 6mm supply coming into a 63A 30mA RCD as a main...
  15. D

    Time delay RCD or Mechanical Protection

    Okay! So, I’m looking to plug a knowledge gap. The set up is a DB in a main dwelling and a second DB in an outbuilding. The supply from the main dwelling to the outbuilding is 16mm2 split concentric. It is buried in sealed ducting at 1500mm at the deepest point (under the lawn). It comes...
    • daavvee
    • Thread
    • buried delay mechanical protection rcd split con time time delay
    • Replies: 13
    • Forum: UK Electrical Forum
  16. The apprentice

    Overload protection on lighting

    Hi there, was at a 3 phase DB today doing an EICR with another spark, there was a 10amp mcb with 1x 1.5mm2 PVC twin clipped direct feeding 4 high bay lights via a normal 10 amp switch the other spark then got his note pad out and wrote no overload protection iam say there kind of thinking a...
  17. S

    SPD protection commercial and industrial

    Hi Trying to sort an argument here, am I right in saying that ALL work including altering existing circuits in commercial and industrial installations requires SPD protection unless a risk assessment is completed. The only exception would be a direct replacement for maintenance purposes? Thanks
  18. S

    Overload Protection of "submain"

    Hi can someone help me with this situation please. The service head/meter is in a brick built housing box in the middle of a field, we are running power to a house some 40m away from it and im not sure of the most suitable method of protecting the 25mm SWA cable from overload. The DNO fuse is...
  19. T

    RCD protection to outbuilding

    Not 100% sure on the requirements for RCD protection of outbuildings. I am going to run 10mm2 SWA, about a 20m Run, to a sub board in the outbuilding, buried in the ground. The main house is on a TN-S, and the outbuilding will have a 32Amp hot tub, a few small fridges, a couple TV's, sockets and...
  20. L

    Surge Protection

    A DNO supply fault this week resulted in damage to several electronic devices (audio equipment, chargers, appliances. USB ports sockets etc). My question relates to the best type of surge protection to negate the effects, not just of transient overvoltages, but of a prolonged overvoltage. It...

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