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Calculate and look up the maximum permitted Zs value ( earth loop impedance ) as per BS 7671. Max Zs Values also includes the 80% temperature adjusted values and a some MCCB 60947-2 manufacture Zs charts. - 100% BS 7671 Zs Values - 80% On Site Guide Zs Values - Printable 60947-2 MCCB Zs Tables - 0.4 (s) second disconnection times - 0.2 (s) second disconnection times - 5 (s) second disconnection times > Common BS EN Devices: Scroll through the list of protective devices and select the device rating to calculate the maximum permitted Zs value for your selected protective device and rating combination. > 60947-2 MCCB's Zs Tables: Look up the maximum permitted Zs tables for a selection of MCCB manufacture devices (some). Maximum Zs Features: + Maximum Disconnection Times + BS 7671 18th Edition Zs Tables + Fuse's + MCB's + RCBO's + RCD's in TT earthing systems + Max REC Ze values + Ze + R1+R2 = Zs calculator + 100% values (BBB) + 80% values (OSG) + 0.4 second disconnection times + 0.2 second disconnection times + 5 second disconnection times + Uo 55v (U 110v) single phase and Uo 63.5v (three phase) Zs values + BS EN 60947-2 MCCB manufacture device charts (some) A maximum Zs calculator for iPhone and iPad. Check out our collection of electrical apps such as the "Pro Certs" Electrical Testing & Certification App or visit https://www.procertssoftware.com/apps for more info.
