Arc Flash for Multiple Sources of Power in Single Control Cabinet

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DCampbell1131

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Pasco, Washington, USA
An existing 25 year old PLC has failed that controls 20 motor starters and valves. The task is to replace the PLC with new processor and I/O cards. Each motor starter has it's own Control Power Xfmr 120vac, 100va, and 8A fuse. A total 20 CPT power and 2-3 other 120vac from various panelboards.
Question is concerning 70E arc flash and the multiple power sources from motor starter CPT's. The 23 different 120vac transformers in a single wireway.
Does someone have to suit up to open the control panel doors? I know I have to install a label "Multiple Sources". But what about protection relating to Arc Flash.

DC
 
I do not think there is any arc flash risk at all from the secondary of a small control xfmr. it is typically a class 1 circuit, AKA limited energy.
 
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