Re: GFCI
The misunderstanding is related to the definition of a GFCI device. In the 2002NEC, 210.8 lists locations where ground-fault circuit-interrupter protection for "personel" must occur. In Article 100 "Ground-Fault Circuit Interrupter" is defined as a "Class A" device. The FPN states the trip range for this GFCI device is 4-6ma.
In the UL White Book Class A GFCI's are shown on page 57.
The Exception to 210.8(A) refers to electric snow-melting equipment, and requires a dedicated (not used for anything else) circuit, not readily accessible (about 7-1/2') - this is for safety reasons. 427.28 (the Article covering snow-melting equipment) requires "Ground-Fault Protection for Equipment", not personel. This is because the Class A GFCI would never allow the circuit to operate because of the heating cable's circuit configuation.
The UL White Book, page 35, provides information on "Equipment Ground-Fault Protective Devices.