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  1. S

    No RCD Protection

    Hi all, I got job which client ask me to replace 20 down lights and install new bathroom extractor fan but DB is not RCD protected.(client dose not want change DB ) can I do my job without changing DB or I must change DB? Thank you
  2. D

    Polarity Test - Extension Lead (surge protection) - Failed

    Hi all, This has got me stumped as it's the first time in 8 years this has happened. I undertook a 250v test on a brand new recently purchased Surge Protection extension lead - all is well but on each of the 6 sockets it failed the Polarity Test. Tested the IEC Lead and all was fine so not that...
  3. S

    Can I omit the SPD on this rewire? + Rant

    I'm about to rewire an empty house, with no electronic equipment or anything else plugged in or installed. Does this mean I can omit installing an SPD because the value of the equipment that could be damaged is less than the price of installing the device? "For all other cases, a risk...
  4. R

    Screen protection on instruments

    The original screen protection stickers that stop the screen from getting scratched on my multimeter and insulation tester were starting to fall off. As an experiment I bought a packet of cheap mobile phone screen protectors, cut them to size and fitted them to the meters. That was a few months...
  5. L

    UK Are surge protection devices fitted before or after the main switch

    Are surge protection devices fitted before or after the main switch
  6. M

    RCCB selection for 3 x Solarlake 17000TL inverters in horticultural location

    Hi There Trying to rectify a solar installation also containing a double socket in a horticultural location. Current setup does not have any RCD protection. Solar setup: 3 phase TNC-S supply - 3 x Solarlake 17000TL inverters - 50kW installation The problem I am having is selecting the...
  7. dlt27

    Time delayed rcd’s and fault protection

    Have been to a farm today that has a 100mA time delayed RCD main switch covering a DB that has MCB’s on majority of circuits ( less than 32A) and 30mA RCBO’s on sockets, lighting etc. What I was thinking was does this comply with regs as circuits less than 32A should disconnect in less than...
  8. N

    RCD spur additional protection

    Afternoon all, Quick fire question. Can a RCD fused spur still be used for additional protection under the 18th. I haven’t got my BBB with me and I recall it giving BSEN numbers for devices used for additional protection and RCD spurs not being one. Job with extra lights and changing board...
  9. A

    Meter tails issue

    Hi guys I'm installing a CU in a new build and have a couple of questions I need some guidance with regards to the meter tails. I need to drill a hole through the wall (for the meter tails) to access the main supplies which are located in the recessed box on the outside of the property. I am...
  10. G

    RCD protection

    hi all conducting eicrs in amusement arcades usually nothing is RCD protected. sockets no RCD protection in general is c3 but when would this become c2 in this instance as it is an existing installation decades old
  11. A

    Zs values when there is additional RCD protection

    Hi everyone, Consider we have an RCD+MCB protection for a circuit. if we follow the tables for Zs values of a 10A, MCB, type C, the maximum value shall be 1.75 Ohm, this happens when 100A current flows ( as per MCB breaking curve). When the RCD disconnects the circuit in much less current, why...
  12. K

    Disconnect, grounding and mechanical protection requirements when bringing power to a chicken coop...

    Hi, I want to bring 2 x 20A (@120V) to a chicken coop. It will be powered from my garage panel which will require 140' of cable. 85' in the garage along 2 walls, and 55' buried between the garage and the coop. I used a few voltage drop calculators and it looks like I will need a 6/3 to stay...
  13. K

    Protection against open/loose neutral?

    Hello friends, is there such a thing as a "smart meter" that I can install on my backwoods house that will trip if it detects a loose/open neutral? If so, where can I get one? Thanks very much
  14. T

    18th edition surge protection

    Hi, School premisses officer here, wanting some advice. Each year we have to have a fixed wiring test on the 6 circuits 3 lighting, 3 power on our swimming pool area. Fed from a 3 phase board. I follow the regs a bit and have a keen interest Due to budgeting I wanted to know if when we get...
  15. A

    UPS protection

    Hi everyone, would be great if you can share your experience on type of protection devices recommended on UPS system feeder/upstream? as you know, in some type of critical installations such as hospitals, bank servers,..etc, the client does not want to see UPS loads gets cuts off in no...
  16. H

    RCD protection

    Good afternoon all. So question for you; if you were doing some minor works on property and noticed lighting circuits are not on RCD protection would you advise the customer? I looked at a small job and mentioned changing mcbs for rcbos. I know there’s people who would just do the work and go...
  17. N

    Surge protection

    Morning all, Quoting for a garage supply and I’m needing too add an additional 1 way board too supply it. Due to space in existing board. Is surge protection required for such a job if I don’t undertake the risk assessment? Or only required for board change and rewires? Thanks in advance
  18. M

    Do I need over current protection?

    Hi guys, i'm working on some project, do i still need over current protection if i'm using a soft starter and do I still need circuit breaker for that motor???
  19. T

    RCD protection for cables above a plasterboard ceiling

    Are there an reg for cables being above a plasterboard ceiling? Pricing a job to move a kitchen to the other end of the house. I thought about running a 16mm T&E to a submain board instead of running 4/5 circuits back. The old kitchen ceiling ceiling is coming down and the rest would be ran in...
  20. FatAlan

    Anyone aware of any surge protection earring it’s keep last night?

    As title, bearing in mind the thunder and lightening last night. :)
  21. mydigitalhome

    Lightning Protection Certificate

    Hello Guys, Hope you can help do any of you have a sample lightning protection certificate that you can send me? I'm working on a site away from home not back for a few weeks and need to refresh my memory on things I need to do. Just had the client make this request so was not prepared for it...
  22. C

    Protection on Tncs / tt system

    Pme Swa sub main supplying external tennis courts. Because of cable size,tt system will be installed. The original Pme supply comes from main distribution area,from a Bill Switchfuse isolator,63 amps. The new tt system is ze 13 ohms,the Pme earthing system is 0.35 ohnms. No connection to the Pme...
  23. E

    Introduction to Surge Protection Devices

    Hi Guys just reading this link & thought someone might be interested Practical tips for installing surge protection devices in low voltage panel | EEP -...
  24. polo1

    Motor protection

    Peeps, I have been asked to run a supply for a single phase, 3.2a extract fan (systemair AW500E4). Is it a requirement, recommended or just good practice to include thermal overload protection in such a situation? Thanks.
  25. H

    Requirements for RCD protection

    Good morning all. So question; if you’re making additions to an existing circuit, but the new cable is not min 50mm deep in wall or mechanically protected and the current circuit is not RCD protected do you tell customer that RCD protection is required as per the regs? My thought is yes and...
  26. V

    Lightning Protection

    I have a Liquid Nitrogen tank getting installed on site, its 16m high adjacent to a taller building and I'm providing the power to it. There are plenty of earth spike locations near it but, purely from observation other sites don't appear to have any means of protection so, how do I know if it...
  27. spud1

    Surge Protection for off peak DB too?

    Hi guys, So I have a domestic scenario where off peak E7 storage heating is installed. Client has asked for a DB upgrade and has opted for surge protection. Currently they have separate ON and OFF peak Wylex fuse boards tailed individually from the origin, the meter is 2 metres away. If I...
  28. FatAlan

    Domestic Lighting - RCD protection

    Coming across a few installations with no RCD protection. How are folks finding it out there when doing minor alterations / additions to existing lighting circuits with no RCD protection bearing in mind 18th Edition requirements. Appreciate every installation is different. Are folks replacing...
  29. chris83

    Adding to kitchen wiring does cooker circuit need RCD protection?

    Hello all, first post by a new member so apologies for any posting faux pas in advance. (Hopefully this is the correct place to ask this rather long question) I’m in the process of re fitting my kitchen and was planning on making a couple of minor changes to the wiring installation. All of the...
  30. a-z electrics

    Surge Protection Devices for domestic - what do you think?

    Evening all, Just attended elex exeter and see there's a big push on these SPDs coming as standard now in domestic consumer units. Hager, Lewden and Contactum to name just 3. I have had at least 2 clients in the last few months whose appliances have been damaged by apparently surges on the...
  31. David Prosser

    Earthing and protection course. EA Technology anyone been ?

    Hi, looking to broaden my knowledge regarding earthing and protection. EA Technology have been mentioned as having decent courses in this area. I would like to hear from anyone who has been on training with them even if not in this field as often a standard will run through most training...
  32. simpson93

    415v 3 phase sockets and rcd protection.

    Afternoon all, Looking for a little guidance, other than doing sub mains in armoured I don’t do much three phase work. I’m looking to install some final Circuits for some three phase cooking equipment but I find myself stuck on a few things, as the sockets will be over 16amp they will need to...
  33. Thomas Simons

    Domestic RCD Protection for lighting within communal parts

    I'm due to start working in a building which houses lots of flats over 6 floors with 2 internal communal stairs. I'm due to replace 13 ceiling lights per floor/stairs from a halogen bulkhead to a ELD 17w LED microwave/emergency bulkhead. Each floor is fed from a Square D B6 QOE MCB on a 3...
  34. spud1

    30mA RCD protection required for existing circuit?

    If I was replacing an existing light fitting in a domestic premises, making no alteration or addition to the circuitry, would I then be obligated to provide that circuit with 30mA RCD protection if it didn't already have it?
  35. P

    C/U Tails in wall - protection required

    The existing C/U is at almost ceiling height in a room and the old tails are plastered in the wall below it before going outside to the meter cupboard (they have no protection and are just covered in plaster). The tails have to be upgraded when the C/U is replaced, so I could take the option of...
  36. T

    RCD Protection for submains

    Evening all We have been asked to do some redial work picked up by a testing company i a hostel. It has been picked up that is no RCD protection in the rooms There are 5 submain circuits that feed the 20 consumer units, 4 consumers units per submain (B32) Each room have a consumer unit which...
  37. Chinese Dave

    Protection to be used on a 5KW motor???

    Hi, I'm Dave and I was wandering if I could have help with something. If I were to wire a 5KW motor what means of protection should be incorporated into the inverter for compliance with BS 7671? Thanks! :)
  38. happyhippydad

    Does this require RCD protection?

    I have been asked to connect a 9kW kiln to the consumer unit. The consumer unit is in the garage and the kiln will also be in the garage. All the cable will be surface mounted, probably in conduit. It's a steeple series E consumer unit with spare ways on the non-RCD side and no spare ways on...
  39. Ian1981

    Overload protection to a central heating pump x2

    Is it a requirement to provide overload protection to a central heating pump rated at 2.77amps? I’m kinda under impression that an almost 3 amp pump jamming will get rather hot. I mentioned this to the heating installer who has requested we just installed 2 x isolators for the pumps through a...
  40. J

    Domestic Protection Against Voltage Disturbances

    Quick Q. Am doing 18th edition at the mo. Reviewing chapter 44 (from p95). Calculated Risk levels for the the use of SPDs. When you have calculated the risk level (CRL), what do you compare it against to know whether the risk is accelerate or not? Worked examples are in the regs book with...
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