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Are back-fed main breaker retaining kits available for use on Combination Service Entrance Devices (CSEDs)?

Can retaining kits be used on CSEDs or Meter Main devices?  

Product Line:  
Load Centers

CSED All-in-Ones and Meter Mains

Back-fed main breaker retaining kits are NOT available for CSEDs or Meter Mains.  These devices must be used as service entrance thus power MUST flow through the meter socket from the utility company, negating the ability for a backfed main breaker.  

Reference article 408.36(D) of the 2017 National Electrical Code (NEC) for further information.  
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