Maximum Z s values for MCCBs to BS EN 60947-2 are not included in BS 7671. Therefore, manufacturers' tables should be consulted for the rating of the MCCB to be used. Alternatively, the maximum Z s value can calculated using the time- current characteristic of the MCCB being used, as shown in Fig. 2 for a 32 A MCCB.. The BS Number is BSEN60947-2 and breaking capacity is 65kA. Attached file includes maximum ZS values, but In order to comply with BS7671 Amendment 3: 2015, the figure in the attachment should be multiplied by Cmin of .95 Released for: Schneider Electric UK
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60947-2 Max Zs Charts. Print or download max Zs tables for BS EN 60947-2 protective devices with the max zs values app. 02/02/2019 17/03/2022. Max Zs Values App Update for 2019. We have published an update to the Max Zs Values app, find out what great new features this 2019 version brings. Categories. BS 5839-6;. For fault protection, the limiting values of earth fault loop impedances, Z s, are given in Tables 41.2, 41.3 and 41.4 of BS 7671, for many commonly-used overcurrent protective devices. The values given in those tables are the limits that apply under earth fault conditions, when the temperature of the con ductors can
