Max Zs Values

Max Zs Values

18th edition Max Zs values.

✔ BS 7671 100% Values
✔ On Site Guide 80% Values
✔ 0.2s Disconnection Times
✔ 0.4s Disconnection Times
✔ 5s Disconnection Times

+ Extra Zs Calculators and Tables

Download Max Zs Values for iPhone, iPad or Android

Bs EN 60947-2 MCCB Charts Includes some manufacturer BS EN 60947-2 MCCB Zs value printable tables

55v and 63.5v Zs Values Includes a calculator which calculates Uo 55v (U110v) single phase and 63.5v three phase Zs values from table 41.6

RCD's in TT Systems Zs Values Includes a max Zs calculator for RCD’s in TT earthing systems from table 41.5

Maximum Disconnections Times Disconnection times from table 41.1 with a bit extra info

Screenshots

Description

Max Zs Values is an easy to use Zs ( earth fault loop impedance ) value tool for looking up and calculating the maximum permitted Zs value for RCBO’s, RCD’s, MCB’s, fuses and some manufacture MCCB’s. We have coded the Zs tables from BS7671 in the app ready to calculate a Zs value.

Spending hours hunting for the correct Zs table is now thing of the past with this Max Zs Values app.

Zs Tables

Table 41.1 – Maximum Disconnection Times
Table 41.2 – Maximum Zs Values for Fuses at 0.4s
Table 41.3 – BS EN 60898 and 61009-1 Zs Values
Table 41.4 – Maximum Zs Values for Fuses at 5s
Table 41.5 – Zs Values for 61009-1 & 61008-1 in TT Systems
Table 41.6 – Zs Values for Uo 55v (single phase) and 63.5v (three phase)

Disconnection Times

0.2 seconds (s)
0.4 seconds (s)
5 seconds (s)