I am installing in-floor heating which requires a 240v circuit in a room that now only has 120v circuits. I have run another hot wire to one circuit to get to 240v, do I need to have a separate neutral or can I share the neutral with the 120 circuits?
by 
rcdahlberg
ANSWERS: 3
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They can share a neutral.
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- * Robert Wilber Licensed Philadelphia Electrician Philadelphia License # 3516 - 16765 * (LIFE SAFETY WARNING! [disclaimer] Electricity is dangerous! You can be injured or killed! Improper installations can cause fire, injury and death! Should you be doing this yourself?) * Are you qualified to do this work? * National Electrical Code definition, NFPA 70 2005 Article 100 I: Qualified Person. "One who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training on the hazards involved." * DO NOT EVER derive 240 volts from two 120 volt circuits in a remote location. 240 volt heat won't NEED a neutral. STOP NOW, before someone gets hurt. It is neccessary to run a new line back to the panel to get 240 volts. If it is a 120/240 installation, then you need to run a 3-wire with ground. If it is straight 240, you need a 2-wire with ground. * I recommend you call a professional for this.
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All conductors from the same circuit must be in the same cable or raceway.
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