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Post by dickpuller on Feb 28, 2021 12:00:43 GMT
Here’s JW the poshest Spark I know, he explains it in-depth;
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Post by pb on Feb 28, 2021 14:57:03 GMT
12.5 would be your amp measurement Dickie as a healthy immersion you would have about 19 ohms. If your immersion is 3K. You do a resistance reading on the immersion and if it's healthy you would get a reading around 19 ohms. 240 divided by 19 = 12.6 .....that's your amp rating and we know it's 13 amp so all good . Personally I test I have 240v through the stat, if I have the immersion element has to be faulty. In most cases I do find a faulty immersion will normally keep tripping the box. Sorry, you’re absolutely correct PB I made a cunt of my Ohms Law & have the Amps instead of the Ohms. I’ll amend it for future reference, even a Plumbing Artisan & God, like my good self, can get it wrong!! That’s only happened once before!!  |
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Post by rocketmanbkk on Feb 28, 2021 15:38:52 GMT
Good job
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Post by rocketmanbkk on Feb 28, 2021 15:49:43 GMT
A question that may be stupid but I’ll ask anyway
When you test the immersion with your multimeter, I take it you turn the power off?
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Post by pb on Feb 28, 2021 16:17:00 GMT
A question that may be stupid but I’ll ask anyway When you test the immersion with your multimeter, I take it you turn the power off? Always Rocky when testing resistance/continuity but power on obviously when testing you have supply through the stat or to the stat. A good point to always remember when testing in junction boxes etc is that a multimeter gives you the voltage difference between the two wires you are testing, if you had your probes on two wires that are both 240v the meter will read 0 volts and that is when people seriously fuck up.  |
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Post by rocketmanbkk on Feb 28, 2021 17:14:00 GMT
A question that may be stupid but I’ll ask anyway When you test the immersion with your multimeter, I take it you turn the power off? Always Rocky when testing resistance/continuity but power on obviously when testing you have supply through the stat or to the stat. A good point to always remember when testing in junction boxes etc is that a multimeter gives you the voltage difference between the two wires you are testing, if you had your probes on two wires that are both 240v the meter will read 0 volts and that is when people seriously fuck up. I need a basic course in electric really. Get me started. Cheers pb |
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Post by DIYDafty on Feb 28, 2021 17:44:35 GMT
Jeezus - is that live touching the copper pipe? That should be bonded and so should trip the circuit? As for testing, my mate a spark says that they are tought not to use those electric test screwdrivers as they use YOU as the "neutral" return - thats why you have to put your thumb over them. I argue with him because most people wouldn't have a proving unit etc and even the sparks merchants sell them (albeit much better quality than in screfix etc). I use them as a last final test when I "know" the circuit should be off. Quick anecdote: A few months ago I was putting a new socket plate on. I was virtually sure the electrics were off at the board as I had just been doing some other stuff. I normally use a voltmeter as a last check when I have a good neutral or earth. This time I was pretty confident it was off and really stupidly missed out the VM step, but thought I'd do what I sometimes do if my test screwdriver is out of reach. I grabbed the live and neutral by the sheath and pushed them together. Bang and flash. It shit me up so much and my heart started racing so much I didn't know if I'd been shocked or not! Course I hadn't but if I hadn't done that final final "test" and given this was a 30A ring main I could easily have been dead. Turned out I had been working on the cooker circuit and just didn't bloody think and think again that I had moved to the kitchen ring main. As PB says, especially around a switch you gotta be careful as there might not me a neutral or earth to test against as they could both be live. |
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Post by cylinderfella on Feb 28, 2021 22:39:25 GMT
Here’s JW the poshest Spark I know, he explains it in-depth; The John Ward channel on youtube is brilliant! He has everything on there  |
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Post by cluelesskarl on Mar 1, 2021 7:14:08 GMT
The sticker says it must be earthed Dafty.  |
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Post by dickpuller on Mar 3, 2021 6:13:05 GMT
Jeezus - is that live touching the copper pipe? That should be bonded and so should trip the circuit? As for testing, my mate a spark says that they are tought not to use those electric test screwdrivers as they use YOU as the "neutral" return - thats why you have to put your thumb over them. I argue with him because most people wouldn't have a proving unit etc and even the sparks merchants sell them (albeit much better quality than in screfix etc). I use them as a last final test when I "know" the circuit should be off. Quick anecdote: A few months ago I was putting a new socket plate on. I was virtually sure the electrics were off at the board as I had just been doing some other stuff. I normally use a voltmeter as a last check when I have a good neutral or earth. This time I was pretty confident it was off and really stupidly missed out the VM step, but thought I'd do what I sometimes do if my test screwdriver is out of reach. I grabbed the live and neutral by the sheath and pushed them together. Bang and flash. It shit me up so much and my heart started racing so much I didn't know if I'd been shocked or not! Course I hadn't but if I hadn't done that final final "test" and given this was a 30A ring main I could easily have been dead. Turned out I had been working on the cooker circuit and just didn't bloody think and think again that I had moved to the kitchen ring main. As PB says, especially around a switch you gotta be careful as there might not me a neutral or earth to test against as they could both be live. Mate, Neon Testers are the worst thing to use FFS!! If it gets wet, you’re toast son!! You clearly hav very little regard for your own safety, which explains a lot!!! |
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Post by cluelesskarl on Mar 3, 2021 13:31:58 GMT
I was warned off them nearly 40 years ago. Terrible things! So lucky/privileged to have been apprenticed to some great blokes!
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Post by DIYDafty on Mar 3, 2021 14:37:10 GMT
Jeezus - is that live touching the copper pipe? That should be bonded and so should trip the circuit? As for testing, my mate a spark says that they are tought not to use those electric test screwdrivers as they use YOU as the "neutral" return - thats why you have to put your thumb over them. I argue with him because most people wouldn't have a proving unit etc and even the sparks merchants sell them (albeit much better quality than in screfix etc). I use them as a last final test when I "know" the circuit should be off. Quick anecdote: A few months ago I was putting a new socket plate on. I was virtually sure the electrics were off at the board as I had just been doing some other stuff. I normally use a voltmeter as a last check when I have a good neutral or earth. This time I was pretty confident it was off and really stupidly missed out the VM step, but thought I'd do what I sometimes do if my test screwdriver is out of reach. I grabbed the live and neutral by the sheath and pushed them together. Bang and flash. It shit me up so much and my heart started racing so much I didn't know if I'd been shocked or not! Course I hadn't but if I hadn't done that final final "test" and given this was a 30A ring main I could easily have been dead. Turned out I had been working on the cooker circuit and just didn't bloody think and think again that I had moved to the kitchen ring main. As PB says, especially around a switch you gotta be careful as there might not me a neutral or earth to test against as they could both be live. Mate, Neon Testers are the worst thing to use FFS!! If it gets wet, you’re toast son!! You clearly hav very little regard for your own safety, which explains a lot!!! errr that's what I said and you shouldn't do anything with the power on and wet hands. It could also fail if it had been physically shocked/damaged. I use them when I know a circuit is dead so I'm not testing it I'm just applying one final check which is especially useful where there is no useable earth or cpc as they call it nowadays. Its safer doing that than not doing it .... |
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Post by arfur chrysaik on Mar 3, 2021 22:00:46 GMT
A question that may be stupid but I’ll ask anyway When you test the immersion with your multimeter, I take it you turn the power off? Yes, also when testing the element for resistance remove the wires from the element terminals. |
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