ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Light activation in closet by a broken connection?
by geoff in UK. 02/19/19 01:35 PM
AFDD's coming to the UK
by Texas_Ranger. 02/18/19 02:04 PM
Israel
by Texas_Ranger. 02/18/19 02:01 PM
250.104
by gfretwell. 02/16/19 01:08 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 20 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Phase Convertor Sizing #195763
08/20/10 04:18 PM
08/20/10 04:18 PM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 849
Michigan
MCA 74 on compressor unit (all mts taken into account).
240 v single phase to 240 v 3 phase.
40 hp convertor .
input Aprox 127 amps
outputaprox 100 amps.
Comments???
Yoopersup

2017 / 2014 NEC & Related Books and Study Guides
Re: Phase Convertor Sizing [Re: Yoopersup] #195777
08/22/10 03:10 AM
08/22/10 03:10 AM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 947
Regina, Sask.
I'm guessing you're looking at a rotary converter. Do the motors need to be de-rated? The math looks off between single phase input and 3 phase output.

Re: Phase Convertor Sizing [Re: twh] #195779
08/22/10 12:15 PM
08/22/10 12:15 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Any chance of doing this with VFD's? Appropriately sized VFD's can convert a single phase input to three phase.


Few things are harder to put up with than the annoyance of a good example.
Re: Phase Convertor Sizing [Re: Tom] #195780
08/22/10 02:18 PM
08/22/10 02:18 PM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 849
Michigan
This is a Full HVAC unit was ordered wrong. MCA on name plate 74 amps single point hookup.
So need about 80 amps or so on three phase side.
As starteres ect are all ready in the package looking for 3 phase power imput. Vendor told us 40 hp unit well do the trick just checking.
Yoopersup


Featured:

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

 

Member Spotlight
Bill Addiss
Bill Addiss
NY, USA
Posts: 3,904
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 9
Popular Topics(Views)
253,265 Are you busy
189,895 Re: Forum
179,608 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.022s Queries: 15 (0.004s) Memory: 0.9594 MB (Peak: 1.0927 MB) Zlib enabled. Server Time: 2019-02-20 13:37:58 UTC