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Student & Learning Zone - City & Guilds
How Fast Should A Fuse Trip If Cannot Let Go?
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<blockquote data-quote="SBS Dave" data-source="post: 323845" data-attributes="member: 22030"><p>BS4293 was the UK standard @ 200 ms @ 1 x, but was replaced by BSEN61008 @ 300ms, to align with Europe.</p><p></p><p>Most RCDs / RCBOs trip around 20-30 ms @ 1 x and. 5 x , based on the principle of SAFETY versus AVAILABILITY. 20-30ms is the right balance between safety (trip speed) and availability without limiting availability by nuisance trip.</p><p></p><p>With regard to Agricultural applications, my understanding is that livestock is less susceptible to shock than humans, hence no requirement for Shock protection in he Regs (705). For ADS, sockets &lt; 32A need RCD trip @ 30mA and 100mA for &gt; 32A. All other circuits need only be 300 mA. For Fire protection, the requirement is 300mA, with or without time delay, depending on need for continuity of service.</p><p></p><p>My own RCBOs tend to trip around 20ms for 1 x and 5 x.</p></blockquote><p></p>
[QUOTE="SBS Dave, post: 323845, member: 22030"] BS4293 was the UK standard @ 200 ms @ 1 x, but was replaced by BSEN61008 @ 300ms, to align with Europe. Most RCDs / RCBOs trip around 20-30 ms @ 1 x and. 5 x , based on the principle of SAFETY versus AVAILABILITY. 20-30ms is the right balance between safety (trip speed) and availability without limiting availability by nuisance trip. With regard to Agricultural applications, my understanding is that livestock is less susceptible to shock than humans, hence no requirement for Shock protection in he Regs (705). For ADS, sockets < 32A need RCD trip @ 30mA and 100mA for > 32A. All other circuits need only be 300 mA. For Fire protection, the requirement is 300mA, with or without time delay, depending on need for continuity of service. My own RCBOs tend to trip around 20ms for 1 x and 5 x. [/QUOTE]
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How Fast Should A Fuse Trip If Cannot Let Go?
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