In Chapter 9
220.127.116.11 Arc-resistant equipment shall be permitted.
What type of equipment, somebody could help me given a photo o reference of this type of equipment.
In thje 2019 Edition of NFPA 20 18.104.22.168 states "No arc fault interruption means shall be installed in any fire pump control or power circut. Now immediately after it 22.214.171.124 states Arc-resistant equipment shall be permitted.
This requirement mostly regards controllers (which, if they are FM approved or UL listed, shall be fitted with arc resistant breakers by default) and switchgears that feed controllers. On the outside, arc resistant cubicles of the switchgear do not differ from commonly used ones - all the secrets are hidden inside.
To get more clear understanding, please download a pretty nice presentation from ABB
Hope this will assist somehow.
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