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
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
Reply to Burnt neutrals in the UK Electrical Forum area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.