IEEE C37.21a-2020

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IEEE Standard for Control Switchboards–Amendment 1: Control and Secondary Circuits and Devices, and All Wiring

Published By	Publication Date	Number of Pages
IEEE	2020	16

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Description

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.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C37.21a™-2020 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
11	Contents
12	7. Construction 7.1 General requirements 7.1.5 Control and secondary circuits and devices, and all wiring
13	7.1.5.1 General 7.1.5.2 Voltage transformer fusing 7.1.5.3 Control, secondary, and logic level wiring
14	7.1.5.3.1 Wiring across a hinge 7.1.5.3.2 Wire size
15	7.1.5.3.3 Wire protection and support 7.1.5.3.4 Wire type
16	7.1.5.9 Voltage circuit protection 7.1.5.10 Current transformer secondary circuit protection

Additional information

Standard Title	IEEE Standard for Control Switchboards–Amendment 1: Control and Secondary Circuits and Devices, and All Wiring
Published Code	IEEE
Publication Date	2020
Pages Count	16

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IEEE C37.21a-2020

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