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.
