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Joined: Apr 2006
Posts: 8
Junior Member
300.3(C), FPN does not allow the thermostat wire in the supply.

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Joined: Jan 2003
Posts: 4,391
Welcome to the forum Barf.

Spaceballs Fan?

300.3(C), FPN does not allow the thermostat wire in the supply.

FPNs do not allow or prohibit anything.

FPNs are not code.

We could say 725.55(A) prohibits it but that is not entirely correct either.

There are ways to code compliantly run the the control circuit in the supply raceway.

But in general it is easer to keep them separate than to jump through the hoops needed to combine them.

Bob Badger
Construction & Maintenance Electrician
Joined: Apr 2006
Posts: 8
Junior Member
Yes, I loved John Candy

Isn't the 725 rule enforceable though?

Joined: Mar 2005
Posts: 1,803
The supply is via a dedicated A/C 25A breaker on the consumer unit, to a 2 pole 40A isolator C/W neon [oversize, but available to me ] direct to the outside unit. There are no 'thermostats' as such, all units have a microprocessor and use sensors to decide on rate of heat/cool as programmed from remote hand held 'blippers'. From the outside unit to each of the inside units are run 4-wire control cables, = 2 digital signal, 2 hot, twin ground wires, twin neutrals. The A/C runs with inverter technology - infinitely variable dc drives, ie. compressor soft starts and runs at optimum speed for maximum efficiency, all the time. You can hardly hear either inside or outside units and the minimum rated COP is 4.
Had it running today on heating while doing some sheetrock with Denise. 4kw of hot air for about 850W of juice from the poco.

Lovely! [Linked Image]


ps I should add that from the remotes I can ask for; temperatures on each zone, [cool or heat], plus: fan speeds, timed operations 24/24, direction of air by flap or by programmed swing, on-off, fans only, dehumidify, and filtration level, [ionify, zeolite, particle], or I can just specify a temperature and let the machine run itself on automatic. The processors handle the actual differentials.

[This message has been edited by Alan Belson (edited 04-10-2006).]

Wood work but can't!
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