#### R1+R2 Zs Ze Calculator

A quick an easy way to verify measured R1 R2 values.✔ Calculate R1+R2

✔ Calculate Zs

✔ Calculate Ze (not recommended)

**Download R1+R2 Zs Ze Calculator for iPhone, iPad or Android**

### Screenshots

### Description

R1+R2 Zs Ze Calculator for calculating or converting the circuit resistance (R1+R2) and Earth Loop Impedance.

**R1+R2** = Circuit Resistance. **Zs** = Circuit Earth Fault Loop Impedance. **Ze** = External Earth Fault Loop Impedance.

#### Calculate R1+R2

To calculate R1+R2:

- Enter a Zs value
- Enter a Ze value
- Tap Calculate

#### Calculate Zs

To calculate Zs:

- Enter a R1+R2 value
- Enter a Ze value
- Tap Calculate

A great electrical app for electricians carrying out electrical testing for verifying the measured values.

### App demo

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#### What is Zs?

Zs is the value of Earth Loop Impedance of an electrical circuit measured in Ohms.

Circuit protective devices such as MCB’s and fuses have a maximum permissible Zs value known as Max Zs.

The maximum permissible Zs values for Fuses and MCB’s vary depending on the device type and rating.

MCCB and ACB maximum Zs values also vary between different manufacturers.

To lookup or calculate the maximum permitted Zs value for circuit protective devices take a look at our Max Zs Values App.

**MCB** = Miniature Circuit Breaker.

**MCCB** = Molded Case Circuit Breaker.

**ACB** = Air Circuit Breaker.

#### How to Calculate Zs

To calculate Zs:

- Input an R1+R2 value.
- Input a Ze value.
- Tap Calculate.

#### How to Calculate Ring Circuit R1+R2

To calculate a ring circuit R1+R2 value we need to measure the r1 and r2 end to end values of the ring final circuit.

**r1** = Ring Circuit, Line Conductor.

**r2** = Ring Circuit, Circuit Protective Conductor.

This R1+R2 calculator can calculate the R1+R2 value from the known measured Zs and Ze values.

We also have a** r1 r2 to R1+R2 converter** calculator included with our Electrical Tools and Re