grounding central heating equipment

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smallfish

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Detroit
A residential 15 amp furnace circuit is just two wire romex with no equipment ground wire. The gas-fired furnace has been replaced with a new furnace and it's enclosure is grounded (like the original furnace was) with a 14 awg single conductor terminated to the furnace enclosure and run to within 5 feet of the metal cold water pipe entry and clamped to it. Where in the code is this allowed? Is it allowed?
Thanks
 
250.130(c) has an exception, but it is for receptacles

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smallfish said:
A residential 15 amp furnace circuit is just two wire romex with no equipment ground wire. The gas-fired furnace has been replaced with a new furnace and it's enclosure is grounded (like the original furnace was) with a 14 awg single conductor terminated to the furnace enclosure and run to within 5 feet of the metal cold water pipe entry and clamped to it. Where in the code is this allowed? Is it allowed?
Thanks
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One would think, if the furnace is replaced, the cost of a new circuit would not add too much to the overall cost of the installation. Since it is a new installation, I would say the circuit supplying the furnace would be required to follow all of the standard code requirements, such as a circuit with an EGC.
 
grounding central heating equipment

Yes, I do believe that the furnace circuit is a seperate circuit. Switching off the breaker kills power to the furnace and the basement lights all stay lighted. The furnace cable back to the panel is not visible throughout the ceiling joists.
 
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