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Just a thought
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<blockquote data-quote="Tony S" data-source="post: 480632" data-attributes="member: 20864"><p>How much credence I put to this I’m not sure. It’s from a friend in the US.</p><p></p><p>Tony- have you let them know UL was copying the UK system when they made AFCI’s here in the US? And AFCI’s only came out because at 120V the loop impedance was too high? And that US electricians don't know what loop impedance even is?</p><p></p><p>The story of how they came to be is even more damning. We only got them because electricians don't calculate loop impedance. The original idea was to have a solenoid in every breaker but was rejected because the lowest loop impedance also happened to nuisance trip on appliances. So instead they went to electronics.</p></blockquote><p></p>
[QUOTE="Tony S, post: 480632, member: 20864"] How much credence I put to this I’m not sure. It’s from a friend in the US. Tony- have you let them know UL was copying the UK system when they made AFCI’s here in the US? And AFCI’s only came out because at 120V the loop impedance was too high? And that US electricians don't know what loop impedance even is? The story of how they came to be is even more damning. We only got them because electricians don't calculate loop impedance. The original idea was to have a solenoid in every breaker but was rejected because the lowest loop impedance also happened to nuisance trip on appliances. So instead they went to electronics. [/QUOTE]
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