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PLC wiring standards

I know this is an old tread...nevertheless, what is the bizarre history behind the standard industry practice of blue color wire for all +24VDC wiring in an industrial control panel (with the exception of a grounded 0 volt / negative) and then all wire is identified with wire number labels to...
- Dr. G7
- Post #19
- Jul 21, 2020
- Forum: Programmable Logic Controller - PLC
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standard wiring colors

I know this is an old tread...nevertheless, what is the bizarre history behind the standard industry practice of blue color wire for all +24VDC wiring in an industrial control panel (with the exception of a grounded 0 volt / negative) and then all wire is identified with wire number labels to...
- Dr. G7
- Post #16
- Jul 21, 2020
- Forum: General Automation Chat
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Electrical wiring color code standards

I know this is an old tread...nevertheless, what is the bizarre history behind the standard industry practice of blue color wire for all +24VDC wiring in an industrial control panel (with the exception of a grounded 0 volt / negative) and then all wire is identified with wire number labels to...
- Dr. G7
- Post #45
- Jul 21, 2020
- Forum: Process Control
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Electrical wiring color code standards

I know this is an old tread...nevertheless, what is the bizarre history behind the standard industry practice of blue color wire for all +24VDC wiring in an industrial control panel (with the exception of a grounded 0 volt / negative) and then all wire is identified with wire number labels to...
- Dr. G7
- Post #44
- Jul 21, 2020
- Forum: Process Control

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