![]() ![]() ![]() In the 2017 NEC, new language was added to allow TC-ER cable to be run without a raceway in one- and two-family dwelling units as long as the cable contains BOTH power and control conductors and is identified for pulling through structural members. For many years, the NEC has prohibited these types of installations in Section 336.12. Sometimes the equipment supply house sells the TC cable with the HVAC unit and assumes that it can be used without a raceway simply because the cable is marked TC-ER (ER = exposed run). HVAC companies often try and use Tray Cable as a wiring method between the outdoor and indoor units of a split system HVAC installation. Code Change Summary: Changes were made to the uses permitted for Power and Control Tray Cable (Type TC).įor quite some time, the incorrect use of Tray Cable has created conflict almost everywhere.
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