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  1. A Basic Understanding of Voltage, Current and Resistance.

    A Basic Understanding of Voltage, Current and Resistance.

    An easy to understand lesson in Voltage, Current and Resistance for electricians. Learn about the basics of voltage, current and resistance in this video tutorial.
  2. S

    Voltage on disconnected cable

    I think I may be going mad...job I was at today there was a strip light needing replaced, were 3 feeds & neutrals and a feed & switch wire at it. Was sure I marked everything ok but as there are ceiling panels going on before the light goes back on I thought I’d do a quick check, turned light...
  3. S

    High and Low Voltage Wiring

    Hello, I recently had my flat rewired and requested that all wires be chased into the walls. Because my walls are made of a very hard brick and to save on mess and noise, some of the power cables for plug sockets were run along the bottom surface of the walls, to be hidden by skirting boards...
  4. I

    Is the strength of a magnetic field directly proportional to voltage?

    I understand current is, however is voltage? As if you increase voltage the current must increase(unless resistance does). However does this mean voltage is 'directly' proportional to magnetic field strength?
  5. Michaelp

    Fluke voltage tester cable

    I have 2 Fluke T150 and the cable broke on both and need to be changed.Is being 2 years now with heavy use so is not a surprise. Dont want to use a normal flexible cable. I have seen on Fluke website that is suppose to be a special cable to withstand the pulling, bending as much as possible.It...
  6. H

    USA Low voltage reading on OFF circuit

    On standard residential house wiring (USA). Working on a single circuit with the circuit breaker in OFF position at the wall. When connecting a decent (Klein) multi-meter to black and neutral (white) wires I see a low voltage reading of .4260 (POINT four two six zero) showing on the multi-meter...
  7. C

    EDF meter change fault

    Hello guys EDF came out to a flat and attempted to replace the meter. I have been called out to investigate there comments which are “unsafe to remove meter, possible borrowed neutral, voltage at meter even with fuse removed (dropped neutral test)” First off i am currently on site, I removed...
  8. happyhippydad

    Realistic cable size for voltage drop

    My customer currently has a shed at the bottom of his garden. The shed is approx 70m from the house as it is a huge garden. The shed has electrics going to it. They are from another shed 20m away on a 1.5mm cable. This shed is from a spur off a socket in the house on a 13A FCU. It is 2.5mm. So...
  9. L

    Connecting 2 12v fans

    Hello, I need some help with this: I have a Xbox one S where I connected 2 Fans (there is usually just 1 ) parallel to the 12v sourve from the motherboard. Fan 1 has 22mA and Fan 2 has 29mA. My Question now is, if there is any risk to burn something. I dont know how much amp is delivered by...
  10. T

    Voltage dropped

    So after what I thought was a productive day yesterday replacing old lights with LED panels, 3 of them weren't working. Turns out the voltage between line and neutral was about 210 at each of the 3 points, 245 between line and cpc. Voltage was 245 between line and neutral at all other points on...
  11. A

    Domestic High voltage plug sockets

    Recently changed plug sockets and light switches. Have noticed before this was done we were burning through light bulbs. A few of our plug sockets are high voltage 250 -270. Any ideas
  12. R

    Voltage Indicator and Proving Unit

    So I’ve managed to sell somethings and decided to buy a voltage tester and proving unit. I’ve seen this on eBay: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F293104145650 Or would you just pay the extra and go for this or another brand? The one on eBay...
  13. TonyMitchell

    Temporary Power - Voltage stability affected by Photographer's Strobes

    Was at a small event recently providing generator power & distribution to the usual line-up of PA system, bar refrigeration, coffee stall, etc. plus a photographer's tent. The photographer had two budget Godox studio strobes. I place a multimeter at the distro on AC voltage min/max and check...
  14. S

    High Voltage AC and DC

    Can someone explain to me exactly why high voltage is classed as 1000 for AC and 1500 for DC?
  15. M

    not showing voltage

    Hi Guys. When testing an electronic light transformer on or off load 240v/60w for output voltage my old Fluke 77 or my new Fluke 117 won't detect any voltage either on AC or DC or auto, but my Fluke T120 will pick up the 12v output. Anybody know why this is. Thanks Mack.
  16. S

    Hazardous areas - control voltage transformer earthing -

    I've been in an ongoing debate regarding earthing of a control transformer and i'd like some other opinions. 690 primary, 120v secondary supplying control circuits (contactors/DC convertors etc), the neutral is tied to earth - My issue is the location that it is tied to Earth. As far as I know...
  17. N

    Voltage on gas meter

    Not been on for long while, so hello again, but just walked in and got a call, person had gas leak, whilst being repaired they tested gas meter and had. 230v from live to gas meter. Disconnected sup bonding and still had 230. It’s TT system, anyone came across before.
  18. G

    Domestic Smart light switch showing voltage when off

    Hi - went to a client tonight to wire a two way lightwave smart master and slave switch. When connected as stated on instructions the light was permanently on and when the switch was actually pressed on the bulb flickered. When I checked voltage across the live and switch live terminals it...
  19. A

    TIS 851 self proving voltage tester any good?

    I was looking at the Kewtech KT1780 voltage tester in toolstation, when I see the TIS 851 that is self proving and wondered if anyone used one and they are any good.
  20. M

    Commercial 6 core flex mains and low voltage

    CP electricians supply a 6 core cable from their lighting control boxes that supplies a mains voltage emergency light,, 2 cores of this are 18v dimmable switching. A led lighting company have provided the led lights and drivers that connects to the 6 core flex however their emergency pack and...
  21. A

    Domestic Intermittent fluctuating voltage

    We have a problem in my daughter’s new build house (2 years old). She noticed the problem started 2 weeks ago when her lights would flicker at random. The lights can be ceiling lights and table lamps so it’s affecting the lighting circuit and sockets both downstairs and upstairs. I have...
  22. I

    Domestic Voltage lower than nominal

    Hi All, I've been called to fit & connect led strip lights in the living room. Full rewiring has been completed recently and two switched T&E cables were left in the ceiling cavity to wire led strip lights Client told me that electrician who did full rewiring in this house supposed to do led...
  23. M

    Solar Edge inverter installed along with pvdc monitor & growatt voltage optimiser?

    Bit out of my area but hopefully a quick one for someone with the right experience. Central Oxford domestic installation done by reputable company for elderly lady. Single property has installed: Solar Edge single phase inverter Growatt voltage optimiser VO60 PVDC Voltage monitor? 3kw battery...
  24. B

    Verifying your non contact voltage tester, the American way.

    I just saw this on r/electricians, which is an electricians subreddit but is populated mostly from guys from the US. I have to say, I appreciate Fluke's warnings : electricians - https://www.reddit.com/r/electricians/comments/b1rv6w/i_have_to_say_i_appreciate_flukes_warnings/eins6m5/ My mind...
  25. J

    Domestic 18th Ed. 715.422.107.2 Extra Low Voltage Lighting Question

    Hi Re the above on page 295 of the 18th Ed. regs, it states that for prevention of fire from a short circuit... One of these areas is a device that protects against short circuit should disconnect within 0.3 seconds when a power increase of 60W (2.5A) occurs. I have looked at a few...
  26. E

    UPS voltage Rating Specs

    Hi Guys, In IT UPS back up systems is there a general upper voltage rating before the device will compensate for overvoltage or is it down to each manufacturers spec. Have been experiencing reports claiming they have been alerted of overvoltages. This I will need to check out. Many Thanks!
  27. M

    Using low voltage lamps and Selv power supplies in domestic livghting

    Hi, I have a ceiling rose which doesn't have an earth wire and I want to connect a light fitting which requires an earth connection. It's not possible to rewire the ceiling rose at the moment so I am considering the possibility of using a low voltage (12 - 85 volt DC) E27 led lamp connected to a...
  28. P

    Fluke t6 tester, non contact voltage reading?

    Anyone got one of these yet? I’ve got the older t5 version and the fingers on the end are really handy with ac current detection. The new one supposedly gives you non contact voltage reading as well. Was in eddies and there was one in a stand on the counter to try out, it wouldn’t work when I...
  29. Ewi

    Current draw discrepancy

    Hey all. Im new to this forum. Seeing how limited d web is to rectifying any electrical queiries, i thought i might find this useful. I am a warranted electrical domestic licencee. (Based on IET) and possess a Higher Diploma in Electrical Engineering. I live in Malta (EU) which uses a UK...
  30. 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...
  31. Digi19

    New to forum, Is it just me!! how have I got Voltage??

    Hello guys, been a voyeur of the forum for some time, just taken a u turn in career later on in life than I should, been out and done my testing and inspection and looking to join a CPS! Iam hoping "its just me" what am i missing? Ive never seen this before! So I'am doing a Ze at home, first...
  32. K

    3 Phase Supply Voltage Problem (Russia)

    Hi, my wife and I are over in Russia where we have an almost completed house. We have a 220V 3 phase supply. Recently we have experienced some electrical problems, mainly related to low power - dim lights, etc. I measured the voltages we are receiving at our house, which are - Phase 1 : 182V...
  33. K

    Multimeter showing reading when nothing is plugged in

    I want to talk about the context to this first, I'm in my first year at college studying level 2 electrical installation and for Christmas my family got me a toolkit which had some tools , multimeter and a soldering iron. They didn't really know much about things like that and they wanted it to...
  34. S

    Stray voltage in Neutral - help

    I have an installation that I maintain and the DNO have recently changed their pole transformer. Since this change I have been unable to do earth loop tests. The supply comes from a HV to LV transformer and there is a HV earth rod right next to the neutral/earth rod for the HV to LV transformer...
  35. Marcus Vaughan

    Domestic Flickering lights, tripping RCD and voltage at consumer unit...

    Hi All, I have just been to a property to fault find a tripping RCD. Lights are flickering. All a bit strange. Vacant property - no loads plugged in. TNCS. The RCD protects socket circuits, CH, garage etc - but not the lights. Anyhow, I tested the the RCD - no problem. I turned off all the...
  36. gazdkw82

    Strange voltage readings - broken earth

    Was fixing a broken twin florescent fitting today and came across something I couldn't work out. First thing I did was measure the incoming voltage. At the fitting I measured L-E =190, N-E = 90v. Scratched my head for a minute until I realized the Earth's coming in from the numerous (4) twin...
  37. B

    Breeze block voltage conundrum.

    Hi all, Was called to a job today with intermittent RCD tripping from the garage. Standard domestic TNS with three core SWA from the house to an (inaccessible) junction box down the side of the garage where it joins to 10mm T&E which then runs on surface plastic trunking to a metal-clad CU on...
  38. R

    Advice on Voltage Testers please.

    I am building up my tool collection, slowly, we have done safe isolation, on our course, so I was looking to buy a Voltage Tester. But I know the Fluke ones have had a recall. But I have seen these two: Fluke T150 Voltage and Continuity Tester - Edwardes -...
  39. D

    Shock from Dyson handheld battery vac...

    So, here is one to debate. Wifey bought one of the cordless V8 dyson vacs, on the basis that all her friends have one. It's pretty handy. But today I discovered an unusual feature. If it detects the motor is working too hard (in this case as the filter was blocked with dust), it will switch...
  40. R

    Lower the voltage of a three phase 220v delta wiring system with auto transformers

    Hi all, I have a three phase 220v delta wiring system but the real voltage is about 240-245V by measuring between the pairs RS, RT, TS. I want to lower it to about 220V so I was thinking to use three auto-transformers 240-220V wired like this: I expect to find 220V between the transformer...

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