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Electrical Inspection & Testing Forum
Zs = Ze +(R1 + R2) Where am I going Wrong
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<blockquote data-quote="Revved Up Sparky" data-source="post: 72072" data-attributes="member: 5050"><p>Just a few thoughts :-</p><p></p><p>When you calculated your R1+R2 did you have the earth/cpc to the load disconnected ?. For example if your circuit fed a water heater then your R2 might have been affected/ reduced by a parallel path through pipework.</p><p></p><p>Did you re-check the Ze again after getting the 13.6 ohm Zs ?</p><p></p><p>I think you will probably find the 1.16 ohm limit applies only to TN systems and that you are allowed a Zs of up to 1667 ohms on a 30mA protected TT installation.</p></blockquote><p></p>
[QUOTE="Revved Up Sparky, post: 72072, member: 5050"] Just a few thoughts :- When you calculated your R1+R2 did you have the earth/cpc to the load disconnected ?. For example if your circuit fed a water heater then your R2 might have been affected/ reduced by a parallel path through pipework. Did you re-check the Ze again after getting the 13.6 ohm Zs ? I think you will probably find the 1.16 ohm limit applies only to TN systems and that you are allowed a Zs of up to 1667 ohms on a 30mA protected TT installation. [/QUOTE]
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Zs = Ze +(R1 + R2) Where am I going Wrong
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