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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="msb2003" data-source="post: 324431" data-attributes="member: 3816"><p>Regulation 411.4.9 - Where an RCD is used to satisfy the requirements of regulation 411.3.2.2 the maximum values of earth fault loop impedance in Table 41.5 may be applied for non-delayed RCD`s</p><p></p><p>Regulation 411.3.2.2 gives disconnection times and table 41.5 gives maximum earth fault loop impedance values for RCD`s, 30mA 1667, 100mA 500, 300 mA 167, 500mA 100</p><p></p><p></p><p>A simple calculation explains the RCD protecting against fire, Power = Current x Voltage, 300mA x 230V = 69 Watts getting hot enough to cause a fire!!</p></blockquote><p></p>
[QUOTE="msb2003, post: 324431, member: 3816"] Regulation 411.4.9 - Where an RCD is used to satisfy the requirements of regulation 411.3.2.2 the maximum values of earth fault loop impedance in Table 41.5 may be applied for non-delayed RCD`s Regulation 411.3.2.2 gives disconnection times and table 41.5 gives maximum earth fault loop impedance values for RCD`s, 30mA 1667, 100mA 500, 300 mA 167, 500mA 100 A simple calculation explains the RCD protecting against fire, Power = Current x Voltage, 300mA x 230V = 69 Watts getting hot enough to cause a fire!! [/QUOTE]
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Student & Learning Zone - City & Guilds
How Fast Should A Fuse Trip If Cannot Let Go?
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