The NEC is a model standard and intended to be adopted by local and state AHJs.
In doing so, the AHJs often take exception to some requirements, and add some
requirements. In adopting the NEC, the AHJs must specify what “listing” means
– what third-party certifiers are acceptable to the local or state AHJ. The
NEC has not mentioned or specified by name a third-party certifier.
AHJs accept third-party certifications according to their local or state rules.
A specific NRTL certification may or may not be currently acceptable.
Now that the 2017 NEC specifies NRTL, it will be interesting to see how the
local and state AHJs accept specific NRTLs, or NRTLs by standards (as does
OSHA), or blanket all NRTLs. Note that AHJs have different objectives than
OSHA, who runs the NRTL program.
Rich
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