protection

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  1. 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...
  2. 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...
  3. 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?
  4. 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...
  5. 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...
  6. 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
  7. 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...
  8. 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...
  9. 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...
  10. cliffed

    Short circuit protection on high resistance on live conductors

    Thoughts on this scenario,obviously a short circuit fault situation
  11. B

    Main fuse protection

    In our house the main fuse is rated at 100A maximum. The individual circuits in the consumer unit, if all used simultanuously, add up to much more than 100A. Now I understand this is common practice as it is assumed that not all circuits will be used to their max at the same time (the...
  12. B

    Surge protection cable length

    Hi all question regarding the length of surge protector cables. I have read the reg 534.4.8 that states that the length should not exceed 500mm. Is that for each conductor so every conductor should be 500mm or less. So with a 3 phase surge protector all 3 phases/neutral and earth should not...
  13. Strima

    Fire Alarm Circuit RCD Protection TT System

    Doing a board swap on a HMO property with a TT system later this week and I've been asked to add OCPD for an L1 fire alarm system. As usual the landlord is being a little cagey with letting me know the other tradesmans details so I can confirm this but I'm on the understanding that a fire alarm...
  14. E

    RCD protection on these tails and why 2 isolators?

    Hi all I have a few questions about that video. 1. I don't understand why there are two isolators on the tails between the meter and the CU. One is fused and one isn't, so what's the point in the one that isn't? 2. Why would this 'require RCD protection' like the guy in the video says? I...
  15. Designmen90

    Fuse for surge arrester protection

    Hello everyone, Is there any rule how to determine the size of fuses which will protect surge arrester. I have 3P+N surge arrester, 20kA, and I need to protect him with fuses. But, how to determine the correct size (amper) of those fuses. tnx
  16. D

    Consumer Unit Fire Protection

    The sparky I am working with always mounts consumer units on a fire retardant board. I am in two minds as to whether this is necessary. Regulation 421.1.201 states that the enclosure must be manufactured from non-combustible material but doesn't mention what it should be mounted on. Can anyone...
  17. RyanAspire

    New circuit design question

    Hi guys, Have a job on next week for a friend, my usual industry is maintenance so want to be sure I am checking all the boxes here. He intially measured the run out at 122m, which would require a 70mm cable due to volt drop, however its changed slightly and I have other queries... He now...
    • RyanAspire
    • Thread
    • cable calculations cable size caravan circuit design earthing mobile new pme protection question rcd static
    • Replies: 53
    • Forum: UK Electrical Forum
  18. Z

    surge/lightning protection

    how do you choose suitable surge diverter/arrester in au to protect single phase residential from surge/ lightning. ie ka rating ? 20ka/40/ka, ph to e
  19. N

    how to take supply from split rcd board without rcd protection

    how to take supply from split rcd board without rcd protection. basically need a non rcd protected supply to feed shed which will have its own rcd ?
  20. J

    Testing and Inspection Over Current Protection

    Hi. Silly Question, as a tester / inspector of an installation. How do i confirm that overload protection is satisfied for an existing circuit, or is it just assumed as long as Coordination (p89 18th Regs) is satisfied and the protective devices is of a EN BS device? Practically, how do i...

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