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Electrical Wire and Cable

Installing a 240 Volt Disconnect

Electrical Wiring for a 240 Volt Panel Disconnect – I have installed several of these connection setups for 240 volt portable MRI trailers and other portable high amperage 240 volt systems.

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Equipment for a 240 Volt Panel Disconnect
[ad#block] Electrical Question: I have a concession trailer with 100 amp breaker box.

This electrical wiring question came from: Arthur, a Homeowner from Old Hickory, TN
See more about Home Wiring for Tennessee

Additional Comments: I love the site

Dave’s Reply:
Thanks for your electrical wiring question Arthur.

Electrical Wiring for a 240 Volt Panel Disconnect

Skill Level: Intermediate to Advanced.
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.

The Following will assist you with your 240 Volt Electrical Disconnect Wiring:

circuit breaker

junction boxes

For more information about 220 Volt Wiring Diagram
220 Volt Wiring Diagram
220 Volt Wiring Diagram

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NEC Codes for Home Electrical Wiring
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Be Careful and Be Safe - Never Work on Energized Circuits!
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FAQs Frequently Asked Questions and Comments

2 Responses to “Installing a 240 Volt Disconnect”
  1. Warren says:

    I have a question on the disconnect. I have a photo of this if I can upload it somewhere to make it easier to see as I am not technical at all!

    We just had a disconnect hooked up with the main power outside out house, as the house is old, it could not be hooked up inside and could not replace the original panel from the 50s. So the power is hooked up, everything looks good, but the power line going from the disconnect into the house is enclosed in a casing, the casing is sloped away from the house and looks cockeyed and not as pleasing as it was straight. I was told this is in case of condensation but other houses seem to have it straight. This is more of a cosmetic issue than a real issue, but little thing’s bug me a lot. Also the casing did not cover the last 6 inches of the disconnect pipe, I was told this is because the casing cannot fit like that as it can’t bend, so the space is there showing the cable outside the casing. If I could upload a photo it would make more sense. thanks for any input.

  2. Dave Rongey says:

    Hi Warren,
    You can send your photo by using the Question Form.
    Please see the Ask an Electrical Question banner or links found on any article page.