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Max Zs
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<blockquote data-quote="Shakey" data-source="post: 22573" data-attributes="member: 1554"><p>Sorry, i well have to ensure my posts are full, accurate and explain all possible commutations of the answer</p><p></p><p>ok here goes</p><p></p><p>under the 17th edition, where MANY circuits are RCD protected, and the RCD satisfies the requirement for ADS in the event of a fault to earth, then the Zs value relating to any particular CPD used in conjunction with the RCD becomes irrelevent, as the RCD will operate before the fault touch voltage exceeds 50V providing that the EFLI of the RCD protected circuit is 1667 ohms or less. As such, concerning yourself with whether or not a 32A Type B BS EN 60898 MCB is below a tabulated value of 1.44 ohms is a futile exercise where the circuit is protected by a 30mA residual current device.</p><p></p><p>i am not implying that ZS is irrelevent OR putting RCD's on every circuit.</p><p></p><p>now while you try and pick holes in that statement, i am off to bed:z</p></blockquote><p></p>
[QUOTE="Shakey, post: 22573, member: 1554"] Sorry, i well have to ensure my posts are full, accurate and explain all possible commutations of the answer ok here goes under the 17th edition, where MANY circuits are RCD protected, and the RCD satisfies the requirement for ADS in the event of a fault to earth, then the Zs value relating to any particular CPD used in conjunction with the RCD becomes irrelevent, as the RCD will operate before the fault touch voltage exceeds 50V providing that the EFLI of the RCD protected circuit is 1667 ohms or less. As such, concerning yourself with whether or not a 32A Type B BS EN 60898 MCB is below a tabulated value of 1.44 ohms is a futile exercise where the circuit is protected by a 30mA residual current device. i am not implying that ZS is irrelevent OR putting RCD's on every circuit. now while you try and pick holes in that statement, i am off to bed:z [/QUOTE]
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