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Using TC-ER Cable For Inverter Output Circuits​

Can TC-ER cable be used for an inverter output circuit? Type TC-ER tray cable is a cable that has been predominantly used for industrial purposes due to its impact and crush resistance, cost-effectiveness and the fact that most products are sunlight resistant and direct burial rated.

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One of the important changes between the 2011 and 2014 NEC for solar systems using microinverters was the addition of permission to use TC-ER tray cable for inverter output circuits under certain circumstances [NEC 2014 690.31(D)].

This transition has raised the question under what, if any, circumstances can TC-ER cable be used for inverter output circuits per the 2017 and 2020 NEC?

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