**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.