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protection

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

    Due to this symbol does this RCD have overcurrent protection?

    Hello, I’ve not come across this symbol on an RCD before. It is the rectangle box with a line through the middle, which means fuse. Could this mean that the RCD could be fused to 80a? If that’s the case I know it would be classed as an RCBO but definitely doesn’t look like one! If it isn’t...
  12. C

    Unsatisfactory EICR - 'No RCD Protection', 'CCU not AM3 compliant', 'Water Bond not Attached'

    Hi, I have an Unsatisfactory EICR with the following observations (full report attached, with key details blanked) - the apartment block was built in 1995 and there was some rewiring in 2010 - are these genuine reasons to fail the EICR? Contacted the inspector who quoted £695 for remedial work...
  13. dodger421

    Inline Surge Protection?

    I've been asked about providing inline surge protection for the UPS supplies in numerous network cabinets around our factory and I'm hoping someone more experienced in this might have some suggestions. There are about 15 cabinets dotted around the factory containing various switches and routers...
  14. Weezy

    UK RCD protection to Meter Tails?

    About 20Meters of 25mm meter tails are routed though the floor boards feeding a sub main. To protect the tails under the floor i was going to fit a Mini Metal Unit with RCD protection Fused at 50A at the mains position, Just wanted to check to ensure it’s a 30ma ‘S Type’ RCD i need? As the c.u...
  15. cliffed

    Rcbo/Rcd protection

    The new breed of sparkies think that if the Zs is high,just stick a rcbo/Rcd on that curcuit. Back 20 years ago there was no way you would do that. Interesting in the code book by Napit,thus is what it says. Opinions plz
  16. C

    Surge protection required?

    My full time job is a maintenance engineer, part time, I'm small domestic electrical work. In the factory where I work contractors are installing new circuits to a sub 3 phase board. Rcd has been installed after the breaker although I know you can buy rcbo's for this board. Nothing wrong here...
  17. S

    Protection of Meter Tails and Length

    Good Afternoon All, I have just completed a Periodic test on a house and have a question about the meter tails. The house is 14 years old so has 25mm meter tails. The CU is in the garage and the meter box is around 7m away on an external wall as you'd expect. Looking at it, I imagine that the...
  18. Designmen90

    IP protection

    IP65C First number: 6 - dust tight Second number: 5 - protection from water jets Why is here additional letter "C". This letter C means - Against acces to hazardous part with Tool. But, the enclosure is already dust tight "6", the dust is smaller then tool, so why this letter C is needed?
  19. W

    Mechanical protection for meter tails

    Does anyone know if there is a product for protecting mains tails in walls apart from conduit? In sure ive seen stainless steel capping or something similiar that can be earthed and is drill bit resistant?
  20. P

    RCD Protection required or Not

    Hi all, Apologies for long post. I have been asked to change two ceiling lights, an extractor fan and shaver socket in a bathroom, this is like for like but the shaver socket and lights would in the zones, therefore in my understanding it makes the job notifiable in England. There is no RCD...

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