Re: lights:
there are 3 rows of conduit, each with 3 boxes containing a quad outlet/
square junction box. from each of these boxes, there are 4 double tube
fluor light fixtures, 90 degrees apart, but 45 degr from the line of the
conduit...think of a chain-link fence pattern on the ceiling, with the
lights at the intersections. Each box is a "node". each outlet is wired
independently to one of 4 switched circuits for Work Zones 1-4. Each node
has 4 fixtures x 2 bulbs=8 (a few actually have 4 bulbs in a fixture).
There are 9 nodes. 9x8=72 bulbs. The ballasts are not commercial
grade...the power factor is (guessing) 0.7, so consumption is 72x40/0.7 =
about 4100 watts....at 117VAC. 40A is close enough. There are also a few
ceiling fans in the alternate nodes over the workbenches. I also have 2
swing-down 500W halogen lights over the benches for detail work...next time
you have a trans apart, try a work light up close and you'll see
imperfections on the metal surfaces that you may not have seen before.
ANyway, you're welcome to use less light if you like.
I didn't list all of the devices in my shop that draw power....the note said
the fellow worked on furniture...he won't need the welders we have, but he
might like more light than most to see the finish on his furniture.
He could be using his dust collector when the Compressor and A/C both kicked
in...the start-up current would be over 100 transiently...may or may not be
long enough to trip.
Anyway you like it, as you yourself mentioned, it's very easy to outgrow
your power supply, and the cost of 200A service now is peanuts.
enjoy
Paul
-----Original Message-----
From: shop-talk-owner@autox.team.net
[mailto:shop-talk-owner@autox.team.net]On Behalf Of Douglas Shook
Sent: Friday, January 12, 2001 2:01 PM
Cc: shop-talk@autox.team.net
Subject: Re: 100- or 200-amp service for shop?
> Lights: 20-80A (i ahve 40A worth of fluoresc in my 23x23...I like a lot of
> light!)
Hi,
You certainly must like a lot of light -- 40 amps is 8,800 watts
of fluorescent power, or roughly 220 40 watt fluorescent tubes
burning at the same time (100 amp service is 100 amps at 220VAC,
or 22,000 watts -- this is a lot of power).
I would have to assume that you are stating amps at 110VAC, still
that would be 110 40 watt tubes -- this seem mighty bright to me,
no? I know that the tubes and ballast will draw more than 40
watts, but my point is still the same.
> compressor: 20A
> table saw: 14A
> radial saw: 10A
> dust collect: 14A
> Heat: 30-100A
> Cool: same
> Radio: 0.5A
Well, yes, but what are the chances of running the compressor,
saw, AC, heat, etc. all at the same time?
Although I probably would install 200 amp service if you are
using a bunch of electrical heaters, have an electrical water
heater, large air conditioners, electrical range, etc., most home
shops will draw way less than 100 amps at any moment (unless you
are using your saw to cut the air hoses off your compressor while
it is running, and are welding something while both the air
conditioner and heater are running simultaneously!! :)
If it is only a $100 or so additional for the 200 amp service, I
probably would still do it, but it most likely would be overkill.
But it will never hurt to have excess capacity...
doug
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