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Do-It-Yourself (DIY) Question & Answer Forum
Ac Confusion
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<blockquote data-quote="ProDave" data-source="post: 393191" data-attributes="member: 6969"><p>The reason we can use single pole switching is because neutral is connected to earth at the substation. So even by the time it gets to your house, it will be very close to earth potential. So assuming you are standing on the floor (earth) and you touch neutral, .you won't normally get a shock.</p><p></p><p>Because neutral is "earthed" then L will be alternating between +230V and -230V 50 times a second (engineers bear with me I know that's not strictly correct) So if you touch that, it's going to hurt. So you have to isolate that before it is safe to touch.</p><p></p><p>If the neutral was not referenced to earth, then you would indeed need 2 pole switching and 2 pole isolation.</p></blockquote><p></p>
[QUOTE="ProDave, post: 393191, member: 6969"] The reason we can use single pole switching is because neutral is connected to earth at the substation. So even by the time it gets to your house, it will be very close to earth potential. So assuming you are standing on the floor (earth) and you touch neutral, .you won't normally get a shock. Because neutral is "earthed" then L will be alternating between +230V and -230V 50 times a second (engineers bear with me I know that's not strictly correct) So if you touch that, it's going to hurt. So you have to isolate that before it is safe to touch. If the neutral was not referenced to earth, then you would indeed need 2 pole switching and 2 pole isolation. [/QUOTE]
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