1. F

    Basic Home CCTV System

    Hi all, I'm looking to install a basic (2 or 3 camera) home CCTV system. Having done some research I gather a lot of the wireless systems aren't the best and can be very expensive for what they are. Therefore I'm looking to install one (possible two) camera on the from of my property on the...
  2. happysteve

    Is there a standard battery for alarm system contol panels?

    (Domestic) I don't touch alarms, out of my area of expertise. However, while doing other electrical work, quite often I'll switch off the circuit (or board) and the alarm will go off, always due to the fact that the backup battery in the control panel is dead. Restore power, alarm stops. My...
  3. B

    Max Zs TN system can’t achieve

    Sorry further on from last post, TNS system, Zs can’t be achieved on final circuits, getting 1.08 Zs on a B63 0.69 but protected by 167 ohms, poor design cable runs are too long and R1+R2 proves this, now I’ve spoke with my boss about what to record in Max Zs is it 0.69 or 167 ohms as all...
  4. A

    Integration of Solar system with multiple utility company's sources in a home

    I have installed 4kw (5kva) solar system at my home. I have 3 phase supply (3 single phase meters instead of one 3 phase connection, i.e 3 separate phases and 3 neutrals, These neutrals are combined at source end of utility company) from the utility company. when I shifted load of one kwh meter...
  5. bigspark17

    Access keypad system

    I have been asked to install a keypad access system in a commercial property, this will be a simple one door install. The property does have a fire alarm does this system need to be interfaced to the fire alarm...
  6. B

    TNS system Max Zs exceeded

    Local caravan site, 16/2C swa out have 3 or 4 Electric points with 2 x 16amp sockets on one circuit protected by B63 MCB now, TNS system Main RCD 100/300 mA protecting MCBs, now I’m testing and getting Max Zs of 0.99 when permitted is 0.69 so pointlet de rating to 50 amp, I don’t like the idea...
  7. P


    Dear Friends, I hope i will find some solution with you. I have installed a system with Goodwe inverter GW10k-ET, hybrid it has 9.3 kwp modules and 6.4 High voltage BYD battery box. This is the situation: We turn on the whole system, everything works perfectly, now we want to simulate a...
  8. B

    No zone valves on my system

    I have oil heat with 3 zones/3 thermostats (basement, 1st/2nd floor) using baseboards. The 3 thermostats are 110v line voltage units that operate the 3 circulator pumps. There are no zone valves on this system. I would like to install 3 Nest thermostats to replace these old line voltage units...
  9. S

    TT System Consumer unit/RCD Arrangments

    HI All, Wondering what the best configuration is for a Consumer unit replacement on a TT system. is a 30ma Split load board with a 100ma time delayed RCD as the main switch suitable in todays standards? do you completely remove the red double pole main switch and replace with a double pole...
  10. R

    Domestic Automatic Transfer Switch and earthing system installation advice

    Hi, I am planning to install a hybrid solar/wind power system. When it comes to 230V AC, I'd like to supply power to a home circuit with mainly LED lighting, It will draw probably never more than a few hundred watts. This circuit is connected on the main breaker panel to a 10A breaker,one pole...
  11. happyhippydad

    Would I still need a gland for the tails and earth on this TT system?

    The installation is TT. The meter box has been moved by the DNO. The tails will now be >3m so I will be fitting a switch fuse. I was planning on removing the DP switch in the switch fuse and replacing with a 100mA S type RCD. I would have put one in place of the main switch in the CU so this...
  12. S

    Electrician Looking for an electrician in East London to update Helvar system

    Looking for someone to update Helvar system in East London.
  13. B


    Got a question (this job is done), Mains is TNS, now there is an SWA from mains that feeds a panel, now I’ve tested this site a few times and readings vary for some reason, now to be safe feeding a new panel which will be outside then to some outdoor sockets, the panel (with upfront RCD) is fine...
  14. Gavin John Hyde

    Smart lighting garden system

    got a job coming up, need to control 4 lots of lights on a garden, will have 4 zones aroind koi pond and decking etc... First thought was a wise systemWise system but customer wants an app for it on his phone. Anybody got suggestions for a decent wireless control system that has a phone app...
  15. B

    solar pannel nickel-iron system question!?

    Ok, so I am a little stuck on one thing for a while now. For a nickel-iron battery bank of 24 volts, each cell is 1.2 volts and has a charging voltage of 1.65, so 33 volts is needed when for optimum charge. The 24 volt, 100Ah battery bank requires a optimal charge rate at c/4 (25 amps for a 100...
  16. M

    Alarm system Arictech CD34 - mobile (SIM) alarm transmission

    Hello, I have an ARITECH alarm system CD 34 with currently an alarm transmission using fixed telephone line (RD6201) and voice extension (4 audio messages broadcast when the connection is established). Question: I would like to delete the fixed line (terrestrial) and use a SIM card transmission...
  17. N

    Grade D fire detection system annual certs?

    HMO property wants an annual periodic inspection cert for a grade D mains linked smoke alarm system. Far as I'm aware only installation and commisioning grade D fire detection system certs exists, and it's not actually recommended to give out annual periodics for these grade D smokes? Wiring...
  18. S

    Previously working PV/Battery system starting popping RCBO when SMETS2 meter fitted

    We had a PV/battery system was fitted in late May, and measurements showed it was working very well, but then a few weeks ago the old meter (electronic box about the size of a large cigarette packet) was replaced with a SMET2 meter and everything went down hill! When the PV system was working...
  19. C

    Integrating Generator with Solar PV System

    We installed a 14.7 kW solar PV system and are now installing a 22 kW whole house backup generator. The solar panels and SolarEdge inverter are on our barn, because its roof had the best sun exposure. The panels on roof of the barn connect to the inverted inside the barn, which connects to a...
  20. C

    138/240Y System

    How would everyone feel about a 240Y system in a building with everything connected Line-Line? I personally like (want) this system. No TN-C, TN-C-S vs TN-S debate. No earthing/bonding debates of how to keep the neutrals separate in a multi source or generator system. No fire or shock risk...
  21. S

    DOL Starter / automatic dust extraction system

    Could I use a DOL Starter circuit to create an automatic extraction system? I was thinking that I could replace the start button and simply wire in a socket instead. So hypothetically if I plugged in and switched on an electric palm sander, it would start up my dust extraction systems (via the...
  22. F

    Vesda Xtralis air aspirating system

    Hello, please i have an issue with the Vesda Xtralis air aspirating system. The system is connected to the central FACP. And formerly coming on alarm fault and fire alarm. But i was able to solve the problem by servicing devices connected to it and changing the resistors. Now the fault was...
  23. F

    System fault on panel 001 short/ circuit

    Please how do i start to check for system fault on panel short circuit. I was able to solve this problem before but now it's taking like forever and am getting frustrated please help. I am working on a Esser IQ 8000 control FACP.
  24. M

    earthing system?

    having a slight disagreement with a maintenance guy on a job im testing... just a bit of banter, but can any confirm this earthing system..?!
  25. Z

    Aillos central venting system

    Has anyone come across one of these, I have one gone down in a flat can't find any dealers etc. Thanks for any help
  26. S

    Adding PV diverter to battery system - using delay switch??

    I am trying to add an Apollo Gem diverter to my battery grid tied system (Victron ESS). It is not going to work because both systems are fighting for the surplus solar power to either charge the battery or divert to immersion. If I add a delay timer switch in the immersion circuit so the load to...
  27. D

    Domestic Earthing a PV system question

    I am fitting up a small PV system on a porch roof using a small (Plug in Solar) 4 panel rig just would like to know if its lightning earth grounding wire can be threaded under tiles to emerge as required at its brackets (to be neater), or would it need to be topside. Figure there are rules for...
  28. 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...
  29. J

    L1 Smoke alarm / Fire alarm system

    Can anyone tell me - is there a difference between an L1 fire alarm system and an L1 smoke alarm system?
  30. W

    12V solar powered UV disinfection system

    Hi everyone, I am currently undergoing a small DIY project to make a solar-powered UV disinfection system. The 2 loads I have are a small 4LPM 12v DC pump and a 24V 10W UV lamp. My system consists of a 50W 12V solar panel which is connected to a 3A charge controller, A 12v 14AH battery, a...
  31. C

    Hospital Emergency Power System

    Anyone have a one line diagram of a typical UK or EU hospital? How are the emergency branches divided per code? How many ATSs? What is typical?
  32. salvatore8916

    Fuses and Cables for solar system

    Hallo, I am new in the solar panel tech and I have no experience in make any system. I just got a small house in a garden (10square meters) and I got the following system: 1 solar panel Renology 100W (12V) 1 Inverter (Pure sine wave) 2000W ( Inverter DC12V to AC 220V Converter) 1 EPever MPPT...
  33. D

    Optima alarm system problem

    I have an Optima alarm which went off yesterday without any known reason when I have tried to reset it nothing at all is working. The internal battery hasn’t been replaced for a number of years, could it be that this needs replacing and if so, is that all? Thanks
  34. R

    Issues with old-school sixties system

    Hoping someone can advise on this - driving my classic today, 2 years after rebuild including complete rewire and has done 4,000 miles with no trouble. The car has a typical sixties oil-filled coil, distributor, points replaced with aftermarket module, new AGM battery, new leads everywhere etc...
  35. happyhippydad

    Cable size and how to earth this system?

    Morning.... I have a friend of a friend who is just looking for some advice regarding his 12V solar set up. It's a metal shed approx 5m x 3m. My 2 questions are: 1. Does the cable joining each of the 5 batteries have to be 50mm as well as the cable from battery to 3kW inverter? I'm sure it...
  36. 1

    Max Zs @ 80% TN-C-S System

    Morning all, I'm currently finishing off my Lvl 3 C+G and I just need to finish off my design spreadsheet then I'll have completed it. I've one last column to fill in "Max Zs @80%" the design is based on a hotel using a TN-C-S supply. I'm just wanting to know where I can find this information...
  37. D

    Domestic New small solar system advice needed

    Hi all, just got hold of 2 12v 98amh deep charge batteries could someone advice the cheapest way to complete solar system. I want to use it at my allotment to power mist spray bench, grow lights in greenhouse a small water pump and possibly lights and stuff in shed. I assume the batteries would...
  38. E

    Earthing System Query

    Hi, just a quick question... I’m at the stage now where I’m being pretty nosey at other people’s consumer units/supply set ups etc to further improve my understanding and recognition of the different earthing systems found in domestic properties. The image below was taken at a member of my...
  39. mhar

    TT system eic minor point

    New circuits. Ra of 229 Ohms therefore the rcds are for fault protection by design. Zdb of 0.29 (10mm gas bond) so are the rcds classed as additional protection?
  40. Michael J

    The maximum value for Zs on a TT system is 50/I delta. So for a 30mA RCd is 1667 ohms

    why is this not the case if the final circuits on a TN-S or TN-C-S system are protected by a RCD? Funny what you think of when you can’t sleep
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