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Thread: How to comply with NEC 240.67 Arc Energy Reduction in 2020

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    How to comply with NEC 240.67 Arc Energy Reduction in 2020

    I'm looking at the 2017 NEC 240.67 and trying to figure out what is available to satisfy this requirement along with the other requirements for PV systems. Currently there is no fused disconnect switch that can do this and has a visible blade disconnect. It will soon be 2020, any ideas? This is going to put a real crimp in PV system interconnections over 800kW.

    I'm thinking maybe an "electronic" fuse that will replace the standard fuse in a bladed disconnect but so far I have not found anything.

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    You can use a bolted pressure switch and have the shunt trip activated by an arc flash relay 240.87 (B) (4).

    https://info.littelfuse.com/arcflash
    Ron

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    Possible, but a lot of assembly required unless someone is selling an integrated unit. The GE HPC is a contender except no visible blades. This is the reason 240.67 has delayed implementation, the CMP involved was hoping there would be products on the market that would provide this functionality by 2020. So far I'm not seeing anything ready to go. Sure we could cobble something together out of parts but that was never the intent.

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