ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Burning out of return(white) side of 120volt rec
by crselectric. 06/14/19 02:15 AM
Video door bell causing chime activation of coil
by JoeTestingEngr. 06/13/19 12:43 PM
Troubleshooting Voltage Drop Across Relay
by gfretwell. 06/09/19 11:49 AM
Apple Recalls Three-Prong Wall Plug Adapters
by Admin. 06/05/19 09:06 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 5 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Electrical Calculations #76682
03/12/01 06:44 PM
03/12/01 06:44 PM
A
AFFELEC  Offline OP
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
Re: Electrical Calculations #76683
03/12/01 07:04 PM
03/12/01 07:04 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,372
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.

Re: Electrical Calculations #76684
03/12/01 07:26 PM
03/12/01 07:26 PM
A
AFFELEC  Offline OP
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


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Samurai
Samurai
Fl.
Posts: 46
Joined: May 2007
Show All Member Profiles 
Top Posters(30 Days)
Admin 2
Popular Topics(Views)
255,730 Are you busy
191,696 Re: Forum
181,476 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.016s Queries: 14 (0.004s) Memory: 0.9508 MB (Peak: 1.0759 MB) Zlib enabled. Server Time: 2019-06-18 07:29:57 UTC