Abstract
Nonmetallic sheathed cable assemblies are commonplace throughout the electrical construction industry. The maximum current and ambient temperatures to which these cables can be exposed are listed in NFPA 70, National Electrical Code® (NEC)®. Laboratory test data presented here show the effects of exceeding these limits. Properties of the insulation materials in a standard cable assembly are evaluated using simultaneous thermal analysis (thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC)) coupled with Fourier transform infrared spectroscopy (STA/FTIR). Cable temperature under actual-use conditions is presented as a function of load current. Insulation resistance measurements of heated cable are included.
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