Converting a Fluorescent Light to an Electronic Ballast
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I need advice about fluorescent ballasts replacements. I have 3×48″T12 lamps installed in a line: one 2 tube fixture,and a single tube fixture The lamp of the single fixture will not illuminate (even after changing the tube). Can a light fixture with a electronic ballast share the same circuit with a light fixture with a magnetic one? |
Fluorescent Light Fixture
Electrical Question: Can a light fixture with an electronic ballast share the same circuit with a light fixture with a magnetic one?
- I am looking for some advice about fluorescent ballasts replacements.
I have 3×48″ T12 lamps installed in a line: one 2 tube fixture,and a single tube fixture The lamp of the single fixture will not illuminate (even after changing the tube). The two tubes of the double unit work. - It appears two tubes operate off a 2 lamp ballast, an RQM 2S40 TP. The third (single tube) is off an HM 140 TPC ballast, which I suspect is burned out.
The single and double light fixtures share the same circuit wire (black white) Both ballasts have wire nuts connecting them to the same power cable - An electronic brand ballast has a chart tht shows a replacement for the HM 140 TPC is an electronic RELB 2S40-SC. (A 2 tube ballast which can be used for a single tube light by capping off the yellow wires).
My Questions:
Can the electronic ballast share the same circuit with the magnetic one?
Is there any problem using the two tube ballast on a single tube fixture?
This electrical wiring question came from Wayman, a Handyman in Canada.
Additional Comments: Finally, an advice site that is concise and covers all kinds of situations. You are very knowledgeable.
Dave’s Reply:
Thanks for your electrical wiring question Wayman.
Converting a Fluorescent Light Fixture
Application: Convert a Fluorescent Light Fixture Ballast.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrical Contractor, or Certified Electrician.
Electrical Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester, and appropriate Safety Gear.
Estimated Time: Depends on the personal level experience, ability to work with tools, install electrical circuit wiring, and the available access to the project area.
Electrical Safety: Identify the electrical power source to the Fluorescent Light, turn it OFF and Tag with a Note before working with the electrical wiring.
Electrical Wiring Parts and Materials: Electrical parts and materials for the Fluorescent Light should be approved for the specific project and compliant with local and national electrical codes.
Electrical Codes and Inspections: Installing or changing home electrical wiring should be done according to local and national electrical codes as adopted in Calgary, Canada. A permit and inspections may also be required.
Wiring Fluorescent Light Fixtures
This electrical wiring project is about a Fluorescent Light in a Kitchen.
The existing light fixture:
The magnetic ballast:
Fluorescent Light Magnetic Ballast to Electronic Ballast
Reviewing and answering the questions asked:
- Can the electronic ballast share the same circuit with the magnetic one?
- YES – There is no problem with this configuration.
- Is there any problem using the two tube ballast on a single tube fixture?
- NO – As long as the label on the ballast specifies that this is an acceptable configuration.
- IMPORTANT: Be sure to install new lamps that are listed as compatible with the new electronic ballast. Commonly, electronic ballasts require T8 lamps, however the T8 lamps are fully compatible with the existing lamp sockets.
Part Reference: Fluorescent Light Fixture, Electronic Ballast
This is an example of a new electronic ballast that will replace a magnetic ballast.
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