J
Jonspark
Why is it always the neutral that overheats on shower pull switches? I've never seen a burnt live conductor.
Discuss Burnt neutrals in the UK Electrical Forum area at ElectriciansForums.net
Thought as much, but it's happened to me twice on my own shower and I've been mindful when tightening them up. Thinking about it, I suppose it can't be any other reason.Theory: people habitually wire the line first, and don't pay as much attention to torquing up the neutral screws.
That's it. I knew it all along.Cable manufacturers secretly make the return path cable a little bit smaller. They think no one will notice......
That's it. I knew it all along.
Electrons are racist. They don't like any cable that starts with a "BL". More of an issue than Putin in my opinion.
hmmm. they used to be OK with black. praps it's colours with a ue in them, anti european, like fagash farage.
hmmm. they used to be OK with black. praps it's colours with a ue in them, anti european, like fagash farage.
I had a burnt live yesterday but I was expecting a neutral.Why is it always the neutral that overheats on shower pull switches? I've never seen a burnt live conductor.
Consider yourself DismissedWhy is it always the neutral that overheats on shower pull switches? I've never seen a burnt live conductor.
Why is it always the neutral that overheats on shower pull switches? I've never seen a burnt live conductor.
And you win tonight's star prize for the correct answer.I love shower threads so !!
Once current has flowed through a fixed resistance the returning voltage drops.
That drop in voltage creates a back emf that is harmonically amplified by an increase in current.
Now the harmonics become resonant, and over time create mechanical vibration that work the terminal screws loose.
This in turn creates a bad connection producing heat.
So effectively if line and neutral are torqued to equal values, over time it is the neutral that becomes susceptible to a loose connection. :icon12:
Why is it always the neutral that overheats on shower pull switches? I've never seen a burnt live conductor.
I love shower threads so !!
Once current has flowed through a fixed resistance the returning voltage drops.
That drop in voltage creates a back emf that is harmonically amplified by an increase in current.
Now the harmonics become resonant, and over time create mechanical vibration that work the terminal screws loose.
This in turn creates a bad connection producing heat.
So effectively if line and neutral are torqued to equal values, over time it is the neutral that becomes susceptible to a loose connection. :icon12:
You're going to have to tell me if you're joking? I don't mind admitting I just don't know if you are or not!!
I don't think I'm going to say anything else :smile5:
You're going to have to tell me if you're joking? I don't mind admitting I just don't know if you are or not!!
I don't think I'm going to say anything else :smile5:
Standard R1+R2 testing on a radial carries out no test on the neutral therefore no poor connection in the neutral will ever be picked up. I'm sceptical about this having any kind of statistically significant part to play though.
You have to bear in mind that on AC, if you ignore potential difference to earth, the neutral spends exactly half of its time being the 'live', really
So if it's down to not giving neutral terminals the same attention/tightening up as lives, why doesn't it show in cu as well as shower switches?
There is therefore no test in the standard Code of Practice for the industry that requires the entire Line-Neutral circuit to be proven!
Ring final circuit continuity/polarity test sequence steps 1 and 2 check the neutral continuity, but obviously this only applies to a ring final circuit.
as Trigger (RIP) would have said...... "look after your neutral".
My theory is this: The loose neutrals are the ones that stick in the memory as perhaps more unexpected, and so the brain remembers this. I've just re-read what I've typed and thought 'what a load of cack', but I'll post it anyway. Somebody might think it makes sense! Where's my whisky gone? Daz
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