Was thinking about linking the neutral bars of the split board, but saw one of your replies saying why the need when the links are readily in the circuit. Thank you.
In australia we would need to remove the incoming main neutral as it is earthed further up into the supply and if its a MEN the main earth also needs to be removed from the suppliers neutral link.
Most UK dno supplies combined neutral and earth so my understanding is that because the consumer unit's incoming 100A double pole isolator switch is OFF then the dead short between neutral and earth at the cut out or at the DNO transformer further down stream, is isolated and not part of the circuit being tested. Hence, there is no need to remove the incoming neutral....your DP isolator switch in the off position is doing the same thing effectively of removing the neutral. Have I understood that correctly Mainly?
@@grahamnimmo4656 yes on our systems the incoming neutral is solidly connected to a sealed neutral link that also has the meter shunts the main earth of the premises is also solidly connected to this sealed link in my company anyway. A outgoing main neutral then feeds the unsealed consumers neutral link so no neutral isolation whatsoever from incoming from supply authority to customers neutral link so you have to break the incoming neutral circuit before carrying out meggar testing.
Would you then be able to test at 500v after getting a clear reading on 250v or could that still damage potentially connected loads? Cheers for a good video
Not a spark but have a few questions. If testing a radial socket circuit and there wasnt a load linking Netral to Line at the end of the radial, but there was lets say half way. Would the Line side be under test beyond the last load connected? If there was an partial insulation breach from Line to CPC, wouldn't all of the loads impedance be added to the IR value tested, and somewhat mask the true line the CPC IR value?
What happens if there is not a load on the circuit. Obviously good for a quick global/PAT test but if there is a fault on the line conductor to earth then this will show up. Love your content and this is no bitching comment just here to learn and questions are needed when doing something which is not to regs
So when you say through the loads you mean anything plugged into the ring main for example which will go down line through neutral n back, also I'm guessing 250V so you don't damage anything sensitive. Would you test each neutral bar as the RCDs have separate neutrals?
I commented about using terminal block instead of having bare live wires hanging out on one of his videos - I got told to unsubscribe and got banned from commenting 😂.
If I remember correctly I’m sure these were somewhat non compliant anyways because the lid dropped open rather than dropping shut so as to minimise the spread of fire
@@nathd1748yeah sorry mate, I’m not doubting you or suggesting anything untoward. I just remember them having drop open lids when they were first brought onto the market I can see since they have remodelled them but the drop lid version is still available also 👍
you do if you test at 500v, you would turn off rcd's, take out lamps, neon light pullswitches, anything with led, but new regs say you can test at 250v which doesnt damage vulnurable equipment. he should have mentioned it
How come people call those BG consumer units 'screwfix special' - loads of houses have those & they seem fine to me? If anything it must be nice being able to get replacement RCBO's etc off the shelf in the evening/on Sunday.
1 they’re bg and two , no decent spark fits split loads and more. Modern household tech has WAY more earth leakage than when split loads first came about so with 30ma covering multiple circuits you’re just asking for trouble.
Plus they’re irritating from a consumer point of view… if there’s a fault on just one circuit it’ll take half the house out, instead of just a single offending rcbo tripping
You can't guarantee that loads will be connected on every circuit, surely? Therefore not necessarily testing between line-earth on some circuits? And as mentioned, switching conductors must be tested too.
@@Mainly_Electrical yeah please explain bud,i do t see how it is testing throigh live conductors,,if you probed onto the busbar then yeah i could see that,but only onto neutral bar
@@TheWard1987 because there's loads on the circuits Shane , watch my video ," why am I getting a dead short " I think it's called that ,,, this will definitely help you understand mate, if not get back to me 👌
@@Mainly_Electrical absolutely rubbish, you can't rely on line to neutral being linked through a load, that's NOT a dead short so won't have anywhere near a low enough resistance to be considered linking out. The volt drop through the load will be huge! This is the 2nd short vid I've had come up on my RU-vid of yours today and both have you talking utter crap. You don't seem competent to test tbh.
@@db-bv5rs absolutely, this was just a quick example of a way test the entire installation to earth , that's all it was . Just make sure it's tested at 250V. ⚡️👌
