what are your thoughts?

[pdenni]

Hello all

New to the forum so please be gentle.

Just wanted to throw a scenario out there and gauge responses,

Checked out a job earlier to move a fuseboard, and upgrade to rcd board, another sparks had been in before and stated to the owner that even though he found high resistance after ir tests on the lighting circuits he would shift that circuit onto a non rcd mcb and deviate it.
Now ive also been taught through college and lovely mr niceic inspector that potentially dangerous faults cannot be deviated and have to be rectified, also all light fittings are metal!! which obviously increases fault potential.
whats everyones view on this?

 

[bugsy]

Lenny has posted a very useful PDF on the sticky threads all about C.U. changes which I suggest you read

 

[rocker]

I'm assuming you mean low resistance. If the resistance is low enough to be messing with an RCD, it definitely needs investiagtion.

 

[GStueyXR]

My view is fitting an RCD will only make the installation safer!

But, we want high resistance on IR tests, so what is the problem?

 

[bugsy]

I think he's getting confused with his continuity test hence prev post

 

[sarge]

unless you can gaurantee cables being 50mm deep or more, surely circuits need rcd

 

[pdenni]

sorry i meant low resistance, just checked the link to lennys pdf downloads, very helpful, yes as i thought going by regs circuit cannot be energised with fault and has to be rectified, just bad mentality by other sparks to move off of the rcd protected circuits so it wont trip out, and leave it as is

 

[bugsy]

See you csn gain a lot of information with just a couple of clicks!

 

[pdenni]

cheers bugsy, i had read that info before but seem to have trouble retaining it, all came flooding back after reading through, when the other sparks said to the owner what he planned to do i had to second guess myself, wondering what reg i hadnt seen before!!! lol

 

[thos]

Hello. I'm not an electrician but I'm very interested in electricity. I've tried to find the answer to this in books without success. Alternating current: if the wave is 230 volts positive followed by 230 volts negative 50 times every second, how is it that 230 volts comes out at the other end? I'm sure there's a simplei explanaton , but I can't see it at the moment. Thanks a lot'

 

[bugsy]

its 0-230=0-230 per second google it lots of videos and tutorials

 

[telectrix]

Hello. I'm not an electrician but I'm very interested in electricity. I've tried to find the answer to this in books without success. Alternating current: if the wave is 230 volts positive followed by 230 volts negative 50 times every second, how is it that 230 volts comes out at the other end? I'm sure there's a simplei explanaton , but I can't see it at the moment. Thanks a lot'

the 230v is the RMS value of the sine wave. in other words, an average value. basically you put a meter across the supply and that is what it reads. the only test equipment that can see the actual sine wave is an oscilloscope

 

[thos]

Hi Bugsy. Thanks very much for your very clear explanation. At last I get it after much puzzlement!
Cheers, Thos.