Got a call the other day from a Minion
of a Prominent Businessman (I used to work there, and my business
card said ”minion” on it. Really) “JC, what do you know about
320v 3 phase power supplies?”
A bit of rigging and the judicious use
of a block and tackle got my jaw off the floor. I know he loves to
find the good deals on Ebay, but...”What kind of equipment is
this?” “RTU #5”, which means Roof Top Unit, which means HVAC,
which means Heating Ventilation and Air Conditioning, which means
package unit air conditioner, but you knew that. But 320v 3 phase?
“Email me a pic of the data plate,
and I'll get back to you.” Yeppers, the data plate says “208/230
wye”, There's a thing in 3 phase electron wrangling that
distinguishes between “Y” (wye) and Delta. TL;DR.
Go out on site to check what's there.
There's a fab shop and a design shop, a couple of miles apart. It
used to be a unitary locations, and as power was needed I installed
more circuits , transformers, all that stuff, plus research,
documentations, electrical and mechanical fab...damn I loved that job
even though I was not paid anything near what I was worth. Anyway:
Wow! Mains feed for the 480v 3 phase
has a disconnect, and another disconnect from the mains feed to the
115vac transformer. I can shut this puppy down without going to the
pole! Yay!! Problem still exists, though. 480 is not 230, even if
you whittle down the conductors. And adding up 115 1 phase cannot
magically transform it to 3 ph (catch the electrical joke there?
Shocking, I tell you). But I can still disconnect the 480 without
disturbing the 115 that runs the outlets supplying the computers and
such Double yay!
I shudder to imagine what the old
premis looked like after the firm moved out. I knew that all the
industrial shelving, all the old cubicle partitions, all the old
light fixtures had been moved out. Used drywall stacked and ready for
reuse. Nails and screws all recycled and boxed for re-use. Unused
electrons stored in Bell jars. Leftover conditioned air compressed
and stored in cylinders. So had all the transformers and load centers
I had installed. Palletized, shrinkwrapped, and ready to go.
Now when the average person thinks of a
transformer, the image is of something plugged into the wall to
charge the cell phone, or, in more industrial settings, the thing
that you use to charge car batteries. Big fucker, right? Size of a
cinder block! So go into your back yard. See the wires? See that
big cylindrical thing with fins on? THAT'S a transformer. If you
live in a big apartment complex, it's that big hulking ominously
humming mysterious thing near your electrical circuit breaker box.
You do know where your breaker box is, don't you?
Sombitch weighs about 500 pounds. About
2 foot deep by 3 foot wide by 3 foot tall. Electrical closet is
near the center of the building, and you just can't get a fucking
forklift through the hallways. Good thing I'm still up on Pharonic
Tech. Even better that someone else took care of that before I showed
up, so now I can source a 3phase load center and breakers. After
hours of research (shopping) on the intertubenetwebs, I find a
decent price 10 minutes drive away. Price is about $400, so I did
backup to show Ebay and Amazon prices, mentioned shipping charges and
returns policies. Purchase ok'd, zooming off at 16:55 h (having
notified the supplier that I was in motion, swoop into the lot at
17:04, tap on employee door AND ARE SERVED. God bless all you dudes
at Crawford Electric (CESPO), and I'll bring beer next time.
Promise.
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