L6-20P -> L6-30R

Lamar Owen lowen at pari.edu
Thu Mar 20 19:40:07 UTC 2014

On 03/20/2014 12:27 PM, Gary Buhrmaster wrote:
> "Think of the children!" I hear the 2017 edition of NFPA 70 (aka NEC) 
> may require one to turn off the power to the entire household in order 
> to plug in a coffee maker to minimize potential arc flash hazard.... 
> (just kidding). Gary 


No, I'll just don my >$700 arc-flash suit (8 cal per sq cm rated) before 
making coffee in the morning.....

While I say that somewhat tongue-in-check, arc flash really is serious 
business, see the youtube video called 'Donnie's Accident' to see how 
serious; I had to have a suit because I am in charge of the power 
monitoring for our data centers, and hooking up our Fluke 435 on the 
input to our Mitsubish 9900B UPS requires full arc flash protection at 
the 8 cal level.  I'm glad it's not on our main switchgear, though, as 
the 6,000A busses there require 40 cal suits, and those are really 
expensive.  The smaller feeders don't require the full suit, but I have 
made a habit of wearing it any time I make a measurement with the 435, 
even on the small 30KVA PDU's, mainly just to make it a habit, since one 
wrong move can be very painful.

All to get our actual PUE to do the adjustments on our receptacle costs 
for our data centers.  (our PUE, depending upon the time of year, runs 
between 1.1 and 1.4, by the way).

But that's drifting even farther off-topic.....

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