EMI from residental furnace

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	Question by Ivan Martens posted 16 Jan 2002
	EMI from residental furnace
I'm a general contractor and I have a homeowner question. In the attic we installed a new furnace and new CAT-5E network wire. Do we have to worry about the blower motor in the furnace interfering with the network wire? Thanks Ivan
	Answer by Dmitri Abaimov posted 29 Jan 2002
Dear Ivan, You should be fine if you can just stay 2~3 feet away from the motor itself and the cables that power the motor. The interference will occur, but the electromagnetic field strength will me much lower than the CAT5/CAT6 3 V/m limit. Anyway, it's much less dangerous for the network than for the phone lines since the frequency of the EMI signal is so much different from the signal frequency used by networking equipment. Sincerely, Dmitri Abaimov, RCDD
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