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Thermal Magnetic Circuit Breaker NSX with TMD Trip Unit (Maximum permitted Zsd
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Posted: 2024-03-2110:58 AM
Thermal Magnetic Circuit Breaker NSX with TMD Trip Unit (Maximum permitted Zsd
How do I work out the Zs for this MCCB at 250A the measured Zs value I have is 0.29 ohms am I correct in saying it would be 0.87 ohms Rated Voltage to earth with Cmin (230 Vac x 0.95 ) = 218.5 using this formula The earth fault loop impedance Zs (Ohms) = Rated Voltage to earth (Vac ) / Device opperating Current (A)