ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
twh 10
Admin 4
Recent Posts
Any UL 508 experts out there?
by sparkyinak. 05/21/17 08:57 PM
Heat pump conundrum
by sparkyinak. 05/21/17 08:49 PM
Interesting week
by HotLine1. 05/20/17 11:57 AM
Electrical Pricing Guide
by ElectricianBud. 05/18/17 12:17 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
236,061 Are you busy
170,955 Re: Forum
164,077 Need opinion
Who's Online Now
1 registered members (Radar), 89 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#76682 - 03/12/01 06:44 PM Electrical Calculations  
AFFELEC  Offline
Junior Member
Joined: Mar 2001
Posts: 5
DEKALB, IL, DEKALB
How do you calculate the service requirements for a hotel with multiple electric heat / a/c units. There are approx. 22 of them. I believe you would take th KW each times number of units with standard amperage formula times 125%, but not sure. These units would be on their own service with nothing else.


2017 / 2014 NEC & Related Books and Study Guides

#76683 - 03/12/01 07:04 PM Re: Electrical Calculations  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,308
220-15 seems to be what your after. Note it says "computed at 100%" , which only means no derating of more than 1 unit to me.


#76684 - 03/12/01 07:26 PM Re: Electrical Calculations  
AFFELEC  Offline
Junior Member
Joined: Mar 2001
Posts: 5
DEKALB, IL, DEKALB
i belive your right thanks . if my math is correct then 5,150 watts x 22 , 208 v ea 2wire , 22 amps ea. , total 110 kw w/ 3 phase factor then i should come up with 305.32 amps so a 400 a service 120/208 3 phase would be more than adequate however we put in 2 main lug panelboards 42 cir (225 a)becuase the 2 pole breakers could only occupy 40 spaces ea panel . might put in a 3rd to lighten load on ea of these.then again the extra capacity might be nice w/ a 600 a service and distribution board



Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 810
Joined: April 2004
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.7510 MB (Peak: 0.8760 MB) Zlib enabled. Server Time: 2017-05-22 19:08:11 UTC