[ HOME ]    [ Stock List ]    [ Stock Modifications ]    [ Salesman ]    [ Manufactured List ]    [Technical Index ]   


The Electric Heater Specialists
HEATERS FOR EVERY APPLICATION

wpe1.jpg (1735 bytes)


Technical:  Ohms Law and Wiring Diagrams

Ohms Law
E = Volts, W = Watts, I = Amperes, R = Ohms

To Determine Watts (W):

To Determine Watts

To Determine Volts (E):

To Determine Volts

To Determine Ohms (R):

To Determine Ohms

To Determine Amperes (I):

To Determine Amperes


Variation of Wattage with Voltage Change

Variation of Wattage with Voltage Change


Percentage Variation of Voltage vs. Wattage

Percentage Variation of Voltage vs. Wattage


Wiring Diagrams

Fig. 1: 120V or 240V Single Phase two or more heaters in parallel with thermostat rating adequate
            for line voltage and current

Figure 1

Fig. 2: 240V or 480V Three Phase Deltas (Three Phase Wye) with thermostat adequate for line
           voltage and current

Figure 2


Fig. 3: 120V, 240V, 480V Single Phase two or more heaters in series with thermostat rating adequate
           for line voltage and current

Figure 3


Fig. 4: Two or more heaters wired n parallel with thermostat not adequate for line current (or voltage)

Figure 4

Fig. 5: Two or more heaters wired in parallel in each leg of a 3 phase Delta Circuit. Thermostat rating
           not adequate for line current or voltage

Figure 5

Fig. 6: Single phase or three phase AC only with properly rated SCR power control with thermocouple
           input temperature controller

Figure 6


Fig. 7: Special circuit for switching from parallel operation to a 3 phase Delta Circuit to a pair in series
           operation, with both contactors closed. Circuit operates at full power at element rated voltage.

           With either #1 or #2 contactor open, circuit operates at 1/4 power, with voltage across each
           element at 1/2  rated voltage. Heater element wattages must be equal to give balanced 3 phase
           circuit for both circuits.

Figure 7

Fig. 8: Circuit for switching from a 3 phase Delta Circuit for full power to a 3 phase Wye Circuit at
           1/3 power. Watt density of heater is also dropped to 1/3 of original.

Figure 8


[ HOME ]    [ Stock List ]    [ Stock Modifications ]    [ Salesman ]    [ Manufactured List ]    [Technical Index ]   

HH01580A.gif (1311 bytes)

We can be reached by e-mail at sales@hotwatt.com
When ordering catalogs please include your
phone number and mailing address.