Electrical calculations

 Electrical calculations    General formulas for all applications

 Wattage (Watt)   Voltage (Volt)   Intensity (Ampere)   Resistance (Ohm)    Series or parallel wiring of several identical heating elements

R = Total resistance
P = Total wattage
U and I are respectively voltage and intensity of circuit Parallel wiring number of heating elements 2, 3 or x
R = r/2 ou R = r/3 ou R= r/x
P= 2.p ou P = 3.p ou P = x.p

For example :
2 parallel-wired heating elements rated at 1000W 230V working with 230V generate 2000W at 230V with R = 26,45 ohms
3 parallel-wired heating elements rated at 1000W 230V working with 230V generate 3000W at 230V with R = 17,63 ohms
etc… Series wiring Number of heating elements 2, 3 or x
R= 2.r ou R = 3.r ou R = x.r
P= p/2 ou P = p/3

For example :
2 series-wired heating elements rated at 1000W 230V working with 230V generate 500W at 230V with R = 105,87 ohms (wattage produced by heating elements is 4 times inferior)
3 series-wired heating elements rated at 1000W 230V working with 230V generate 333W at 230V with R = 158,7 ohms (wattage produced by heating elements is 9 times inferior)
etc… 3-phase wiring Delta connection Rated voltage of each heating element is identical to voltage between phases in a Delta connection. Star connection Rated voltage of heating elements equals to voltage between phases of 3-phase wiring divided by or 1,732

Example of wiring :
3 heating elements rated at 1000W 230V wired to 400V 3-phase supply generate 3000W.
3 heating elements rated at 1000W 400V wired to 400V 3-phase supply generate 1000W. © IVALDI 2004 - Home | About us | Contact us | Location | Customers | Legal informations Products : Introduction | Cartridge heaters | Coiled heaters | Band heaters | Strip heaters | Tubular heating elements | Immersion heaters | Air Heating Printed heaters | Temperature sensors | Temperature controllers | Accessories Technical data : Electrical calculation | Thermal calculation | Technical data