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Old 08-20-2018, 09:01 PM   #1
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Default Mcc during lightnng

Today while in a mcc we had a bad storm and took at least 20 direct hits to the site in under 15 minutes.(there is at least 10 mcc's so not all strikes would be related to one of them). My trainee asked if it was safe to be in the mcc when lightning is striking the plant. (not working on anything)

The mcc is brick built and has lightning conductors on the roof, The conductors do enter the roof space and go to a grounding plate with in the mcc which is bonded to the building grounding grid.

I fluffed it and said it was fine especially after opening the door and seeing a strike with in 200' (its safer in here then out there so it was defiantly true at the time).

What do you guys think. Is it dangerous or not?
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Old 08-20-2018, 09:28 PM   #2
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Whichever answer is the correct one, still sounds like fun! Video or it didnít happen!
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Old 08-20-2018, 09:29 PM   #3
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I stand clear of gear during lighting storms.
Saw one MCC blow a bucket years ago.
Also heard one of our older indoor 4160 transformers sing out LOUD when lighting hit a substation 10 miles away. Seconds later power dropped out.

Remember, when lighting hits, it takes all paths to ground. Thank goodness for well bonded systems, right.
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Old 08-21-2018, 12:03 AM   #4
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Seen good shocks from video games, dishwashers, etc.
Stay away from metal or anything connected to metal.
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Old 08-21-2018, 02:09 PM   #5
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Couple of random thoughts- Lightning follows no rules. It does whatever the heck if wants to do. -and- When it's your day, it's your day. I don't tempt fate, but I don't think fear of the boogie man is a good way to run your life.

Probably most of us have seen all manner of random electrical blowups from lightning. Some quite dramatic. If I let it wear on me, I'd never go near anything that operates on electricity during a storm.
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Old 08-23-2018, 06:33 PM   #6
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We missed one of the strikes on a field pump. The pond started to fill up so the boss went to check the pump station.

The guts of the digital meter are laying a few feet from the pole and the meter base is toast. Hopefully the transformers are ok especially as there only 2 weeks old. I dont think the meter can be saved..
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Old 08-24-2018, 02:53 PM   #7
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Quote:
Originally Posted by tjb View Post
Whichever answer is the correct one, still sounds like fun! Video or it didnít happen!
no video but i have a picture

Mcc during lightnng-meter.jpg
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Old 08-24-2018, 03:34 PM   #8
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A tub of Simple Green wipes and a Mr Clean Magic Eraser and that'll be good as new.
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