IEEE C37.21a-2020 PDF
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IEEE Standard for Control Switchboards–Amendment 1: Control and Secondary Circuits and Devices, and All Wiring
IEEE , 07/01/2020
File Format: PDF
IEEE C37.21a-2020 PDF
Align the wiring requirements of this standard with; IEEE C37.20.1, IEEE C37.20.2, IEEE C37.20.3, and IEEE C37.20.9. This amendment will focus on sub clause 7.1.5, the wire used in switchboards.
Amendment Standard – Active. Requirements for control, secondary, and logic-level wiring are addressed in this amendment. It covers wire type, ampacity, and methods for protecting wiring across a hinge.
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