2020 NEC 230.71(B) code change

[Billyv2000]

The 2020 NEC changed 230.71(B) to include separation of disconnects due to electrical shock and arc flash (per Mike Holt, he has a video on this Link:

). The "Old" 400A meter mains had two 200A disconnects with no separation. The "2020 Code Compliant" 400A meter mains have a separate enclosure for each disconnect.

Recently I was on several calls and emails with an electrical supply distributor, Square D, and UL. They have come up with a add on device CDK400 which basically skirts the new code by saying the add on device makes the equipment 1 disconnecting means. I see that to a point, however the device is attached to the dead front. Once the dead front is removed for whatever purpose, how does this give any protection from electrical shock and arc flash? After all, the intent of the code change, according to Mike's video, was to prevent electrical shock and arc flash.

Please give me some insight. I just don't get it.

Sorry, I can't upload any other pictures. Says file to large.

 

[wwhitney]

however the device is attached to the dead front. Once the dead front is removed for whatever purpose, how does this give any protection from electrical shock and arc flash? After all, the intent of the code change, according to Mike's video, was to prevent electrical shock and arc flash.

Here's the logic as I see it:

Normal single disconnect. To work on it safely, you must turn it off before removing the dead front. If you remove the dead front first, you are exposed to a hazard.

Dual disconnect with CDK400. To work on it safely, you must turn it off before removing the dead front. If you remove the dead front first, you are exposed to a hazard.

So equivalent levels of protection.

Cheers, Wayne