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240 Volt Circuits and Switches
©Copyright Dave Rongey - Summary:
Electrical Wiring for 240 Volt Circuits and Switches: Each individual pole of a switch or circuit breaker are rated for the stated amperage, the rating is not a combined total of the number of poles.
Understanding 240 Volt Circuits and Switches
Electrical Question: I purchased a 30Amp, double-pole single-throw switch for a 240Volt circuit dedicated to a steam humidifier for a home ventilation system.
- The circuit includes 45 feet of 12/3 copper wire and a 15A double circuit breaker.
- The humidifier which is an April Aire 800, will use 12.7A peak, 11.5A nominal.
- I’m assuming the switch will be sufficient but is it rated at 30A per line, or is 30A the sum of the maximum amperage for both lines?
- The switch manufacturer’s web site offered no information.
This electrical wiring question came from: Steve, a Homeowner from Damascus, Maryland.
Additional Comments: Impressive.
Thanks for your electrical wiring question Steve.
Preparations for Wiring a 240 Volt Circuit
- Application: Wiring a 240 Volt Switch.
- Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrician.
- Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
- Estimated Time: Depends on personal level experience and ability to work with tools.
- Precaution: Identify the circuit, turn it OFF and Tag it with a Note before working with the wiring.
- Notice: Installing additional electrical wiring should be done with a permit and be inspected.
Electrical Wiring for 240 Volt Circuits and Switches
- Steve, for your humidifier and ventilation system application you could use a 20 amp two-pole switch because the amperage is within the operating amperage range.
- Each individual pole of a switch or circuit breaker are rated for the stated amperage, the rating is not a combined total of the number of poles.
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You identified your project to be about 220 Volt Wiring Diagram, so you might find this information useful:
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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.