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Old 08-24-2012, 09:58 AM   #1
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Join Date: May 2012
Location: brantford canada
Posts: 48
Default How to calculate service amps

I am calculating amp for 600v supply, next is the list of stuff we have to install
600 volt
1 cnc1 - 40amp 3P
2 vacuum1 - 30amp 3P
3 CNC2 - 50AMP 3P
4 VACUUM 2 - 40 AMP 3P
5 stamping mac - 60amp 3p

480 VOLT
Four GRINDER - 40 AMP 3P total for all 4

240 volt 20 amp single phase
110 volt 80 amp

Please check, Is it right or wrong
a)for 600 volt total amp are 210 amp
total watts=1.73x600x210=218kw
b) total watt for 480 volt
watts=1.73x480x40=33.2kw
c) total watts for 240v
watts=240x20=4.8kw
d) total watts for 110v
watts=110x80=8.8kw

total watts=218+33.2+4.8+8.8=264.8kw

total amps service need= 264800/1.73x600=255 amp

so it will be 3 phase 600volt 255 amp 250kcmil conductor size
please check and correct me, yours postive comments will be appreciated thanks

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