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TT to TNC-S
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<blockquote data-quote="steptoe" data-source="post: 11724" data-attributes="member: 7"><p>wrong,</p><p></p><p>you never rely on the RCD for disconnection,</p><p></p><p>unless you have a very poor system of wiring,</p><p></p><p>nobody should ever EVER rely on an RCD,</p><p></p><p>grab the line and N at the same time and see how long it takes an RCD to trip out,,,,,,,,,</p><p></p><p>still waiting,,,,,,,,</p><p></p><p>stil waiting,,,,,,,,,</p><p></p><p>thought so, it wont ever happen until you go overcurrent, then your MCB provides the protection, all down to your R1 R2 and proving a good touch voltage.</p><p></p><p>oh, and the 21 ohm figure, I have no idea where that came from, some DIY book? readers digest?</p><p></p><p>its laughable to think you can get that, Im happy witj anything below 180.</p><p></p><p>nothing to do with your earthing conductor solely, but more to do with a 50v touch, which you will easily comply with if you have a good earth.</p><p></p><p>TOO MANY people read TOO many books and take TOO much as GOSPEL without the relevant knowledge to discriminate and judge by experience and common sense as to what is safe and what is just a published opinion.</p><p></p><p>as mine is too. MHO.</p></blockquote><p></p>
[QUOTE="steptoe, post: 11724, member: 7"] wrong, you never rely on the RCD for disconnection, unless you have a very poor system of wiring, nobody should ever EVER rely on an RCD, grab the line and N at the same time and see how long it takes an RCD to trip out,,,,,,,,, still waiting,,,,,,,, stil waiting,,,,,,,,, thought so, it wont ever happen until you go overcurrent, then your MCB provides the protection, all down to your R1 R2 and proving a good touch voltage. oh, and the 21 ohm figure, I have no idea where that came from, some DIY book? readers digest? its laughable to think you can get that, Im happy witj anything below 180. nothing to do with your earthing conductor solely, but more to do with a 50v touch, which you will easily comply with if you have a good earth. TOO MANY people read TOO many books and take TOO much as GOSPEL without the relevant knowledge to discriminate and judge by experience and common sense as to what is safe and what is just a published opinion. as mine is too. MHO. [/QUOTE]
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