Number of circuits
you require (n)....................................

Define your current
requirement per circuit (I)...............amps

From your conductor size,define contact
resistance (R) from table 3 ..............ohms

**Input your values into the following equation to calculate the dissipated Wattage Dissipated Wattage =(Current (I)2 x Resistance (R)x number of circuits (n)

The maximum permittable
dissipated Wattage allowed is ...........watts

Define the upper ambient
temperature for your application ..........ºC
(See tables 1 &2)

Define the temperature
class (T)you require ...........................T
(See tables 1 &2)

From the relevant temperature
class (T)define your
Shell size ........................................Ex

Select an appropriate Insert from the
selection chart.
The information given is
based on 600v circuit.