ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
sparky 4
Recent Posts
2017 NEC Changes
by HotLine1. 12/14/17 07:24 PM
Dimmable LED 2x4 lay in fixtures
by HotLine1. 12/14/17 07:15 PM
Casino Wiring methods
by HotLine1. 12/09/17 10:44 AM
Ground wire Size to water Line.
by HotLine1. 12/05/17 12:11 PM
Flexible conduit to an outside Spa
by gfretwell. 12/05/17 12:28 AM
New in the Gallery:
Gallery Test
Popular Topics(Views)
243,051 Are you busy
179,486 Re: Forum
170,410 Need opinion
Who's Online Now
1 registered members (HotLine1), 22 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#74705 - 02/02/07 10:34 AM operating cost?  
Rob  Offline
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

#74706 - 02/02/07 10:58 AM Re: operating cost?  
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.


#74707 - 02/02/07 05:20 PM Re: operating cost?  
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.



Member Spotlight
SafetyWired
SafetyWired
Pa, USA
Posts: 44
Joined: July 2013
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.009s Queries: 14 (0.002s) Memory: 0.7516 MB (Peak: 0.8734 MB) Zlib enabled. Server Time: 2017-12-15 00:27:38 UTC