Burden Resistor calculation

Burden Resistor Formulae

R = (Vadc * Nturns) / (2√2 * Irms)

R: Burden resistor value in Ohm
Vadc: ADC max voltage range (usually 3.3V)
Nturns: Number of CT sensor turns (see specs).

SCT-013-000 is 2000 turns.

SCT-019 is 6000.

SCT-006 is 800.

Nturns can be deduced dividing primary current by secondary current. For example the SCT-013-000 is rated as 100A/50mA. Therefore we get 100/0.05 = 2000 turns.
Irms: Max current to be read in Ampere (rms)

Current Coefficient Formulae

This will compute ICAL.

ICAL = Nturns / R

ICAL: Current Coefficient
Nturns: Number of CT sensor turns
R: Burden resistor value in Ohm