system

  1. P

    12v motor causing noise in 240v system

    Hi - On our small vessel we have a 12v failry powerful motor to run the autopilot, where the power is supplied by the boat's battery bank. On an 'independant' system we have 240v that is supplied via an inverter, but the power originates from the same battery bank as the 12v system. The...
  2. T

    Lost Neutral on 3 Phase system - how do you calculate the effect on line voltage

    I know the effect of a lost neutral (floating neutral) on a 3 phase system, and the theory of why the line voltages can vary. However, I have been attempting to show this by calculating the line voltages of a phase system at given loads on each phase. Lets say:- Red 296 Amps, Yellow 279 Amps...
  3. RF Solutions Ltd

    Competition Time: RIoT-FOB Remote Control System and £100 Off Outdoor Lighting @ Lighting Legends

    Autumn is now here, it's that time of year where the clocks go back and lighting control moves forward. A time when UK customers with gardens want to light up their outdoor spaces earlier in the evenings; meaning they'll be looking for new lighting and a reliable method of wireless switching...
  4. Calebp43

    What earthing system have we got here?

    Went to a house to extend a circuit and upon doing the minor works I couldn't figure the earthing system. There was no DNO cutout and L and N came from overhead powerlines. I followed the main earth cable down and it went half a foot below the consumer unit to a connector block with 3 small...
  5. P

    Adding a heat sensor to an existing, interconnected smoke alarm system

    I currently have a home with 7 interconnected, hard-wired smoke detectors. I have a hard-wired heat alarm in the garage that I need to have interconnected to the rest of the system, per local regulations. My solar installer added the heat sensor but does not seem to know how to handle the...
  6. N

    TT System High Ze leading to possible Zs fails

    Doing a lot of EICRs at the moment and have came across what I'm sure is a common enough problem. In an off grid rural cottage I have a TT system, Diesel Generator that runs and charges batteries when they are below 10 percent or so. Ra is about 150 Ohms... was about 3 ohms for Ze before main...
  7. RF Solutions Ltd

    Competition Time: WIN a FERRET Remote Control System & WISKA Goodies from RF Solutions Ltd

    Wireless switching can really simplify an electrical installation. The FERRET is an RF unit that can add remote control to applications. It's tiny size makes it perfect for fitting in small enclosures like the WISKA range. This month, @rfsolutionsltd have teamed up with @wiskaukltd to give away...
  8. W

    Proposal for an inverter for a solar system on a balcony

    Hello everyone, I currently have two solar modules left over from an installation and I would like to use them to set up a solar system on the balcony. The system has an output of 800 W. Can you recommend a suitable inverter for me? Thanks for the help.
  9. ekubec

    TC-ER-JP, cable used for minisplit system -- should it be in conduit outside ?

    Hi, folks.' I have a carrier 38MGRQ48E '5 zone' mini split system with 4 'heads'/evaporators installed, and one 'channel' still open. Had it installed about 6 years ago. At the time the tech said "You really should install the fifth one in your bedroom." I didn't listen to him and now i...
  10. B

    Is the earthing system TNCS or TT

    Carrying out a EICR in a commercial setting. In the main intake room the DNO supply comes in and it states clearly this is a PME system. 5 years ago it had a 120mm earth from the head going on to the MET which then had separate earths to each isolator on the panel. Within that time a new pumping...
  11. Audronius

    New property - looking for help understanding the heating system

    Hello! I've just moved in to a new property with "all electric" heating system and trying to figure it out. The agency/landlord are of no help so trying here. Previously only lived in properties with the usual gas combi boilers so a bit lost. It's a one bedroom flat with two of us living here...
  12. I

    TT System with TNS reading

    Shop with no earth coming from head, overhead lines in sight everywhere - definitely no earth from the DNO. Two 10mm earths going into the DB. One going to the water and another which disappears through a wall somewhere heading towards an external area never to be seen again. Customer doesn’t...
  13. G

    Multi door entry system

    I was working on a small door entry system today (4 flats ). It got me thinking , that say it was 16+ flats system , how would you go about dealing with the 16+ cables at the main entrance . Obviously a junction box system would probably be required , but was wondering how to over come that...
  14. Tom the Elder

    Installing groundwire system

    My 1951 CA home (none of original wiring grounded) has 7 receptacles* that have a separate ground wire extended into the subfloor and connected to the galvanized water pipes. Those pipes will soon be replaced with PEX. My plan is to drive ground rods with a new ground wire extending from the...
  15. B

    Regarding TT earth system

    Hi How do i access the earth rod to service it, where abouts will it be located and does a tt system have upfront rcds which will be probably in another enclosure? cheers B
  16. N

    CT clamp use in PV system

    I'm not going to touch it but I've a PV system installed that has CT clamp in supply meter. What does this do, why does it increase my import from grid?
  17. E

    Auto transfer switch caught on fire - should we be concerned about our house electrical system?

    Here’s what happened, we’re looking for a professional opinion: The auto transfer switch for our Generac stand by generator “exploded” (we heard a bang and the house shook a bit) and subsequently caught on fire earlier this week. It was mounted to an exterior wall. The generator was installed 8...
  18. RF Solutions Ltd

    Competition Time: WIN a NEW Switchlink-IP Rated System - Remote Light Switch Control

    Introducing the NEW IP Rated SWITCHLINK System! This system provides a quick and easy solution to a light switch when cabling is tricky, expensive or time consuming. Features: 868MHz System IP68 Receiver IP66 Outdoor Transmitter Up to 100m range in Buildings Up to 500m Line of sight...
  19. F

    Heating system is via an air source heat pump.

    We have just completed a self build, and heating system is Air Source Heat Pump, unvented HW cylinder, Buffet Tank, all Vaillant equipment. The heating firm have ceased trading before the system has been completed and fully commissioned. Ground floor is UFH with 6 zones controlled by Heatmiser...
  20. cliffed

    TT System with Upgraded DB/CU

    Big argument with a newly qualified electrician with all the necessary qualifications Had to give him a hand later on during the day, nice DB fitted &to be fair quite tidy too , with SPD…It’s a TT System with a good Ze 24.8 ohms. All Rcbo’s except for the Mcb supplying the SPD, which I pointed...
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