With two 600 watt dimmers adding together to create 1200 watts of power. On 120V it would only draw 10 amps so it will be good enough to run a single 14-2 on a 15amp breaker. With dimmer switches it is a good idea to double check that you lights being dimmed will not exceed 600 watts on either dimmer. Exceeding the rated wattage will cause the dimmer to heat up, in turn creating a safety, and/or fire hazard in your home.