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protection

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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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
  7. 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...
  8. 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...
  9. 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...
  10. timhoward

    Air circulation supply, no overload protection, no earth?!

    An agreed limitation of this EICR is that the air circulation unit circuit will not be inspected beyond the switchgear / controls due to no safe means of accessing units on roof of 4 story building. We're discussing how to resolve this. In meantime: I'm inspecting the air circulation supply at...
  11. A

    Surge Protection

    Hi, I recently upgraded my home panel to a Square D qo panel. I had a Siemens FS140 whole home surge protection installed in the first space on a 20 amp double pole breaker. I tend to lose power a lot and get surges from trees on the power lines when it rains. I have two square D HEPD 50 surge...
  12. Designmen90

    Overvoltage protection device - wiring

    Hello everyone, here I found some Siemens manual (attached) for OVD. As you can see, there wrote that for OVD device which is protected with 125A fuses, 16mm2 wire is enough? How it's possible, In my oppinion 16mm2 wire are too small for 125A current. Any oppinion?
  13. L

    Advise on DC Surge Protection - SMA Core2

    I am in the midst of installing a 800kWp PV System. I have selected and ordered 6 nos. SMA Core 2 (12mppt x 2 strings) inverters which have inbuilt DC and AC SPDs as well as 1 isolator per 3 mppts. Need advise if I should use additional external SPDs / isolators per string. Also is anyone aware...
  14. J

    Bathroom RCD protection

    Looking at a bathroom modification and wouldn't mind some input on the need for RCD protection. Bathroom has existing light and wall fan. Customer wants downlights fitting and ive also said the fan needs an isolator as it currently doesn't have one. No other electrical circuits in the room. No...
  15. Chizzle

    Fuse board protection against fire

    Hi guys interested to know what people on here use to keep the fire integrity off the fuse board for rear entry cable entering the board. Thanks
  16. K

    How do you achieve shock risk protection in TT

    Hi everyone I posed a question to my teacher when I was in Level 3 about if we do not use 30mA RCD for additional protection in TT system and use 100mA for fault protection then how do we stay protected from electrical shocks to which he said RA*IA>=50V something like this and when I said could...
  17. G

    C2 on EICR due to RCD Protection

    Hi everyone, I had an EICR certificate done recently and it came back with a C2 for RDC protection on the freezer socket (as below). A picture of the consumer unit is also below. The question I had is what do I need to do to fix it, what is the easiest solution? Does this require the circuit...
  18. H

    EICR unsatisfactory due to 'no RCD protection to lighting circuits'

    Hello everyone I have a 1996 2 bedroom house which I'm about to let out as I lost my job due to COVID and need to relocate. The NICEIC electrician I used for my EICR has given me a code C2 for 'no RCD protection to lighting circuits including bathroom lighting'. To put this right, he's...
  19. S

    Ring Fused Spurs and overload protection (433.1.204)

    Just a quick question from a new qualified sparky. So in 433.1.204 when it says the Iz of the cable must not be less than 20A for a ring final circuit. Does this include a radial fused spur taken off the ring final? If you install it in 2.5mm in trunking then the Iz is immediately down to 20A...
  20. cliffed

    Short circuit protection on high resistance on live conductors

    Thoughts on this scenario,obviously a short circuit fault situation

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