ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Video door bell causing chime activation of coil
by gfretwell. 12/10/18 12:35 AM
Conduit fill Calculations
by gfretwell. 12/08/18 08:39 PM
Pull out fuse panel?
by Trumpy. 12/06/18 02:12 AM
Swimming Pool question
by HotLine1. 12/05/18 12:37 PM
Tingle off the water spigot
by rmiell. 11/30/18 01:03 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 21 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
operating cost? #74705
02/02/07 10:34 AM
02/02/07 10:34 AM
R
Rob  Offline OP
Member
Joined: Dec 2003
Posts: 15
New York
How do you determine operating cost of a 3 phase motor. 460 volt 15 amp.
My utility rate is .08 cents per kwh.
Is there a common formula?

Work Gear for Electricians and the Trades
Re: operating cost? #74706
02/02/07 10:58 AM
02/02/07 10:58 AM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
Measure the actual amps drawn on each leg. Average. Multiply by 1.73. That's your amp load.

From there, it's the usual amps x volts x time x rate = electrical cost.

This will give you figures good enough to work with. Actual results will vary a bit, due to changes in load, power factor, harmonics, etc ... but the number you get will be close enough for budgeting.

Re: operating cost? #74707
02/02/07 05:20 PM
02/02/07 05:20 PM
J
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
One quick and dirty method is to estimate 1KVA of input power for each HP of output.

For a fully loaded motor you can use 1KW per HP. For lightly loaded motors use 1.1KW per HP instead.


Featured:

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

 

Member Spotlight
togol
togol
NW In. USA
Posts: 421
Joined: September 2005
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
252,181 Are you busy
189,164 Re: Forum
178,839 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.017s Queries: 14 (0.004s) Memory: 0.9505 MB (Peak: 1.0732 MB) Zlib enabled. Server Time: 2018-12-13 06:21:15 UTC