electrical formula - to find total amp requirements for small maching shop?

Question

I 've had 2 electritions ask me what my amper requirements are? before they can give me an accurate bid. I have one
lathe one mill , band saw, welder, drill press and other misc.
pwr tools. I also plan on buying at lest 2 or 3 more machines.

Answer 1

To get amperage ratings, add the amp requirements of the motors on all the machines. If your motor is rated at (for example) 120/220V, and 6/3A, use the first value if you have it wired for 110V, and the second value if you have it wired for 220V.

If your motor does not have an amerage rating listed, but does have a wattage rating listed, divide the wattage by either 120, or 220 (depending on the voltage you have it wired for) to get amperage.

If your motor only has horsepower ratings, take the number HP * 746 to get wattage, and then divide that wattage by either 120 or 220 as above to get amperage.

For the machines you plan to add, you can look up those machines online, or find similar machines, and find the horsepower, wattage, or amperage ratings to figure how much current they will draw.

Just to be on the safe side, I would tell the electricians the total value, and then ask for a bid for 150% of that value as well...it's possible that you'll upgrade to more or larger machines later, and that 50% overhead will allow you to go longer without having to upgrade the electrical system.

Answer 2

Either they haven't visited your site (which, in order to get you an ACCURATE bid, they should have) or didn't bother to look over your equipment while they were there!

Each of your existing pieces of equipment will have a rating plate that describes its current requirements (in amps) and voltage. Take a little inventory and note the current required for each.

Take a look at the spec sheets on the 2 or 3 you plan to buy or ones similar, and add those.

Your electricians should be able to handle estimates for lighting and small appliance outlets as a matter of course based upon your square feet and wall space, office layout, etc. If not, find someone else to bid the job.

Figure on a bit of possible growth and expansion when the electrician is putting together his bid.

Answer 3

If they haven't shown up to meet with you and survey the situation, they are probably too busy to care. Try another electrician, better yet, ask around for recommendations.

Answer 4

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