ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#102481 - 04/01/06 04:26 PM Load Calculations
teck_ed Offline
Junior Member
Registered: 12/26/05
Posts: 6
Loc: thorold
I have a 100 amp 3 phase service commercial building. The customer wants to open a tanning salon with 4 beds. 1 is 60 amp, 220 vac, 2 @ 20 amp 220 vac and 1 is 30 amp 220 vac. Also some lights, plugs and A/C 20 amp 220 vac. Is the 100 amp 3 phase service big enough? Your help is appreciated.
Top
Tools for Electricians:
#102482 - 04/02/06 06:46 AM Re: Load Calculations
bigrockk Offline
Member
Registered: 01/25/03
Posts: 174
Loc: Middle of Canada
Hello ED
Check out section 8 of the code book paying paticular attention to 8-210 and table 14.These will help you determine your service and feeder sizes.

You will need to know the outside dimensions of the building to calculate a basic load and then you will have to add in all of the "special" loads.
When determing the current draw of a paticular machine or piece of equipment make sure you check the " data plate" on the machine for this info and do not go by the breaker size it is connected to.
Hope this helps.
Top
#102483 - 04/05/06 05:03 PM Re: Load Calculations
marsbar Offline
Member
Registered: 04/04/06
Posts: 31
Loc: london, ont, canada
Is you 100amp 3ph coming in at 600v? Bigrockk is right you should do a building calc. to be sure.
Top
#102484 - 04/05/06 08:43 PM Re: Load Calculations
bigpapa Offline
Member
Registered: 03/18/06
Posts: 77
Loc: canada
You dont need to do any demand calculations.

The simple answer is no. Add up the KW for each load and find the total current. Its about 87A just for the beds.
Top
#102485 - 04/06/06 05:05 AM Re: Load Calculations
jay8 Offline
Member
Registered: 07/28/05
Posts: 183
Loc: Vancouver, BC
re bigpapa's reply, you still need to refer to table 14 to establish your basic load, then as 8-210 tells us,"special loads .....based on the rating of the equipment installed with such demand factors as are permitted by this Code." Since your existing service will not be large enough, you still need to get out the calculator to determine the appropriate service feeder size.
Top

Member Spotlight
Member Since: 07/05/02
Posts: 8211
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 58 Guests and 13 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
KrmtFrg, Stack, Scotto, Freecrowder, clee512

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals