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Earth Fault
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<blockquote data-quote="michael8554" data-source="post: 551290" data-attributes="member: 34375"><p>If the live wire in a cable accidently became shorted to the earth wire, then the ohms resistance between earth and live would be very low or even zero.</p><p>A component in the boiler that is going faulty might start to show lower than normal resistance between live and earth.</p><p>For example, this starts to happen with the heating elements in kettles, ovens, and immersion heaters.</p><p>Eventually they short out.</p><p>250,000 ohms will cause a leak to earth of only 1mA, one thousandth of an Amp.</p><p>The Residual Current Detector (RCD) breaker in your "fuse box" (Consumer Unit or CU) will only trip at a much higher value of 30mA, the value of "short to earth" considered to be becoming dangerous.</p><p>My "not an electrician" explanation.</p></blockquote><p></p>
[QUOTE="michael8554, post: 551290, member: 34375"] If the live wire in a cable accidently became shorted to the earth wire, then the ohms resistance between earth and live would be very low or even zero. A component in the boiler that is going faulty might start to show lower than normal resistance between live and earth. For example, this starts to happen with the heating elements in kettles, ovens, and immersion heaters. Eventually they short out. 250,000 ohms will cause a leak to earth of only 1mA, one thousandth of an Amp. The Residual Current Detector (RCD) breaker in your "fuse box" (Consumer Unit or CU) will only trip at a much higher value of 30mA, the value of "short to earth" considered to be becoming dangerous. My "not an electrician" explanation. [/QUOTE]
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