483 phase.... what?

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yursparky

yursparky

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Check out the e-mails below requesting some info and the response we got from the GC electrical coordinator. Just makes you wonder.

-----Original Message-----
From: Project Manager
To: Electrical Engineer

Dear Engineer,

Take a look at the responses to the above referenced RFI's. The architect and
design group are indicating all overhead doors were to have power?

Project Manager

-----Original Message-----
From: Electrical Engineer
To: Project Manager

Dear PM,

This is actually a kitchen equipment provider issue. If the doors were
not correctly specified and designed by design group as powered doors, then we
would not have shown power for these doors when coordinating with original
RFC documents.

If these doors are being changed to powered doors, please have
GC and equipment manufacturer provide you and us with the necessary
electrical information so that power can be added to these doors via
ASI.

Thanks,

Engineer

-----Original Message-----
From: Project Manager
To: GC

Dear GC,

We will need the voltage and load information for any overhead doors
that require power so that the engineer can issue ASI's.

Project Manager

-----Original Message----
From: GC Project Engineer
To: Sub Project Manager

Dear Sub PM/Engineer,

I just talked to equipment manufacturer's vendor and he said the overhead doors is
483 phase, 1/2 amp and you can use any voltage you want, just let him know.

Thanks,

GC Project Engineer

Any voltage in the 483 phase? No problem.
 
yursparky said:
Check out the e-mails below requesting some info and the response we got from the GC electrical coordinator. Just makes you wonder.

[/I]Any voltage in the 483 phase? No problem.
Click to expand...

Um, one question.....

Where do you get 483 colors to make sure you maintain proper phase rotation? :D

My guess is someone said four-hundred eighty, three phase, and someone else heard four-hundred eighty three phase.
 
480sparky said:
Um, one question.....

Where do you get 483 colors to make sure you maintain proper phase rotation? :D

My guess is someone said four-hundred eighty, three phase, and someone else heard four-hundred eighty three phase.
Click to expand...

That's what I thought too, but that sentence is immediately followed by
and you can use any voltage you want
Click to expand...
.... so I'm wondering where that came from. :smile:
 
obviously this took place on the phone where 480 / 3 phase sounds the same as 483 phase. the scary part is the GC should know WTF 480/3ph is
 
Yeah, we got a good laugh out of it.... it's along the same line as "220/221, whatever it takes" (no offense), and these are the people that approve our change orders....
 
yursparky said:
I just talked to equipment manufacturer's vendor and he said the overhead doors is
483 phase, 1/2 amp and you can use any voltage you want, just let him know.
Click to expand...

I have more of a problem with the subject/verb relationship. It makes no sense to me. This guy somehow got through college? He must have had some good friends in the fraternity. :grin:
 
Let's think about this for a second. If you have 483 phases that would need a panel that had at least that many spaces, and since most panels you can put breakers on both sides of the buss, wouldn't that mean you need a minimum of 966 space panel. Now if you have the average width of a breaker at 1" now your 483" that is 40 foot 3 inches tall just for the breaker, Good thing they are removing the 42 circuit limit in the panel. I'm thinking this panel will have to be mounted horizontally to fit in the room.:grin: If it is 483 phases what do you think the HZ is?
 
acrwc10 said:
Let's think about this for a second. If you have 483 phases that would need a panel that had at least that many spaces, and since most panels you can put breakers on both sides of the buss, wouldn't that mean you need a minimum of 966 space panel......?
Click to expand...

Not necessarily. You could install a 21-pole breaker on one side of the panel and take 23 leads from each pole. :grin:
 
The SO cable that we use for high phase order motors uses something like 8 colors with various combinations of stripes. For an 18 phase motor we generally use 20 conductor cable giving an EGC and a spare.

Phase rotation can be a nightmare; I am currently dealing with a machine where the phase rotation from phase A to A' to A'' to A'''... is the reverse of that from A to B to C. Of course, this isn't a matter of swapping wires around to change phasing; it is a matter of finding the bug in the inverter control code.

-Jon
 
yursparky said:
Yeah, we got a good laugh out of it.... it's along the same line as "220/221, whatever it takes" (no offense), and these are the people that approve our change orders....
Click to expand...
Better hope they don?t have anyone registered with the site.

 
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