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<blockquote data-quote="TechWise" data-source="post: 6162332" data-attributes="member: 11384"><p>The RCD and the light circuit trip are doing two different things. The "trip" as everyone calls it is a simple overcurrent device. It should only really go if there's a serious fault on the line drawing more current than the rating of the breaker, or if there are just too many things running off that circuit. They can also go if something draws a large startup current like a motor.</p><p></p><p>The RCD is looking at the current flowing into the live wire and comparing it to the current coming back through the neutral. If there's a difference, current must be leaking out somewhere so it shuts off the circuit. It is usually set to detect a tiny imbalance in the order of milliamps. A qualified electrician will be able to tell you how "insensitive" you are allowed to make it - which I am not.</p><p></p><p>It's very strange that it happens when you turn the lights off. Is it a simple on-off switch or is it a setup where you have two switches in different places controlling the same light? Are they ordinary 240V bulbs or are they spotlight type lights with a power supply box mounted in the ceiling?</p></blockquote><p></p>
[QUOTE="TechWise, post: 6162332, member: 11384"] The RCD and the light circuit trip are doing two different things. The "trip" as everyone calls it is a simple overcurrent device. It should only really go if there's a serious fault on the line drawing more current than the rating of the breaker, or if there are just too many things running off that circuit. They can also go if something draws a large startup current like a motor. The RCD is looking at the current flowing into the live wire and comparing it to the current coming back through the neutral. If there's a difference, current must be leaking out somewhere so it shuts off the circuit. It is usually set to detect a tiny imbalance in the order of milliamps. A qualified electrician will be able to tell you how "insensitive" you are allowed to make it - which I am not. It's very strange that it happens when you turn the lights off. Is it a simple on-off switch or is it a setup where you have two switches in different places controlling the same light? Are they ordinary 240V bulbs or are they spotlight type lights with a power supply box mounted in the ceiling? [/QUOTE]
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