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How to Convert a Circuit to be Used for a Sub-Panel
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How to Install a Sub Panel Using an Existing Circuit: Sub Panels Require a 4-Wire Feeder Cable with a Separate Dedicated Neutral – A Dedicated Neutral wire conductor is not required for 240 volt circuits for equipment that does not require a neutral. |
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Sub-Panel Circuit Requirements
Electrical Question: I have an old 220 volt circuit that went to an electric range. We have since switched to N.G. My question is can I reroute the 220 volt cable to the basement and use it for the power to a sub-panel? I only have one receptacle in the basement.
Thanks for the info.
This electrical wiring question came from: Buck, from Emmett, Idaho.
Dave The Electrician’s Reply:
Thanks for your electrical wiring question Buck.
How to Install a Sub Panel Using an Existing Circuit
Skill Level: Advanced – Intermediate to Advanced.
Tools Required: Electricians pouch of hand tools and the various power tools necessary for installing the sub-panel.
Estimated Time: Depends on the type and size of the panel and available access to the project area.
Precaution: Any existing electrical wiring within the immediate area that may interfere with the installation of the sub panel should be identified and turned OFF and Tagged if necessary.
Notice: Installing additional electrical wiring and a sub-panel should be done according to local and national electrical codes with a permit and be inspected.
Sub Panels Require a 4-Wire Feeder Cable with a Separate Dedicated Neutral
- 120/240 Volt Circuits
- A typical sub panel that will be used to supply power for 120 volt circuits.
- Typical 120 volt circuits may be receptacle outlets, lighting, smoke detectors, or any other 3-wire 120 volt device.
Circuit Disconnect for 240 Volt Equipment
- 240 Volt Circuits
- A Dedicated Neutral wire conductor is not required for 240 volt circuits for equipment that does not require a neutral.
- Typical 240 volt equipment may be a hot water heater, air compressor, welder, or any 3-wire 240 volt equipment.
- The circuit amperage requirements must be within the range of the amperage rating of the cable to be used for the circuit.
IMPORTANT:
The total connected load of the circuits that would be added to a sub-panel must be 80% of the amperage rating of the cable supplying power to the sub-panel.
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We have a 220 volt dryer service that we are not using . I am setting up a wood shop in the same building ,can I split the 220 volt service in to a sub panel box & supply my wood working tools with 110 volts ?
Hi Chuck,
If the 220 volt dryer circuit is a 3-wire with a ground then yes you can use the circuit for a sub feed. The 3-wire circuit will have a separate insulated white neutral wire which is required for 120 volt circuits.
If the 220 volt circuit does not have a separate neutral wire then no, you cannot use the circuit for a sub panel.
Dave