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Electrical Inspection & Testing Forum
Domestic PIR & maximum permitted Zs on a TT system
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<blockquote data-quote="ALFRED" data-source="post: 213365" data-attributes="member: 9845"><p>If you go table 41.5 in the regs it gives you the values of Zs for a T.T. installation. It all depends on the RCD in use i.e from a 30mA ( 1667 ohms ) to a 500mA ( 100 ohms ). It then warns you in a note below the table that the rod resistance shouldn't be above 200 ohms because it could be unstable. ( The NICEIC ask for a 100 ohms )</p><p></p><p>Alfred ( the new bloke )</p></blockquote><p></p>
[QUOTE="ALFRED, post: 213365, member: 9845"] If you go table 41.5 in the regs it gives you the values of Zs for a T.T. installation. It all depends on the RCD in use i.e from a 30mA ( 1667 ohms ) to a 500mA ( 100 ohms ). It then warns you in a note below the table that the rod resistance shouldn't be above 200 ohms because it could be unstable. ( The NICEIC ask for a 100 ohms ) Alfred ( the new bloke ) [/QUOTE]
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