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Student & Learning Zone - City & Guilds
Testing a TT System max ZS
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<blockquote data-quote="Sidney" data-source="post: 502560" data-attributes="member: 30039"><p>Use the maximum for RCDs as they're being used for fault protection, so 30mA would be 1667 ohms. Table 41.5.</p><p></p><p>Remember the MCB will protect against short circuit, line to neutral, and the RCD will protect against earth faults.</p><p></p><p>Although not common practice I tend to do a Zn test to confirm the MCB will disconnect within the required times.</p></blockquote><p></p>
[QUOTE="Sidney, post: 502560, member: 30039"] Use the maximum for RCDs as they're being used for fault protection, so 30mA would be 1667 ohms. Table 41.5. Remember the MCB will protect against short circuit, line to neutral, and the RCD will protect against earth faults. Although not common practice I tend to do a Zn test to confirm the MCB will disconnect within the required times. [/QUOTE]
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Testing a TT System max ZS
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