GENERAL INFORMATION
240 VOLTUngrounded Ungrounded Grounding
BLACK RED GREEN
240 120
120
Service Wire ConfigurationSingle Phase Amps = Watts Example 4500W/240V = 18.75A
Volts
Watts = Amps x Volts Example 18.75A x 240V = 4500W
Ohms = Volts Example (240V) / 4500W = 12.8 Ohms
Watts
22
Commonly Used Formulas
Page 3
Wattage Limitation at 240 Volts
Solar Water Heater with Double Electric Element Backup Series (Non-Simultaneous operati on)
Maximum
Wattage
Element
Upper/Lower
5,500 5,500/5,500
3