ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Recent Posts
VFD MotorFeeders
by gfretwell. 10/17/17 10:01 PM
What do you do?
by gfretwell. 10/17/17 01:08 AM
Good ol' copper pipe in the fuse holder trick
by HotLine1. 10/16/17 07:16 PM
Generator Cable Sizing
by HotLine1. 10/16/17 07:13 PM
Another generator question
by HotLine1. 10/16/17 07:02 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
241,362 Are you busy
177,314 Re: Forum
168,941 Need opinion
Who's Online Now
0 registered members (), 54 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#69667 - 09/15/06 04:05 PM Motor hp and FLA  
wendel  Offline
Member
Joined: Aug 2004
Posts: 55
I'm buying a new 1/2 hp blower motor (HVAC). My 16 yr old 1/2 hp Emerson had a FLA rating of 9.9 amps. The new 1/2 hp motors (same rpm, voltage etc) have FLA ratings in the 6 to 7 amp range.

Are new motors more efficient so a 7 amp motor will still deliver 1/2 hp?


Work Gear for Electricians and the Trades

#69668 - 09/17/06 02:57 PM Re: Motor hp and FLA  
jraef  Offline
Member
Joined: Jul 2004
Posts: 101
San francisco, CA, USA
Generally, new motors are in fact more efficient than old motors. There have been Government subsidized programs in effect to increase motor efficiency throughout industry for the last 10 years. Manufacturers who didn't take advantage of the help found themselves behind the eight ball a long time ago.

That said, HP ratings on consumer products have been a big "spin" game for a long time and there are ongoing lawsuits over this issue. I wouldn't trust them as far as I could spit. If you are not referring to a residential consumer product, you are probably OK. If you are, the better way is to look at speed and torque since that is what really matters. If the motor does not provide that information, be suspicious.


JRaef

#69669 - 09/17/06 05:25 PM Re: Motor hp and FLA  
Dave T  Offline
Member
Joined: Jan 2005
Posts: 155
Waukesha, WI, USA
Are they both NEMA rated motors?


#69670 - 09/17/06 08:30 PM Re: Motor hp and FLA  
Surfinsparky  Offline
Member
Joined: Jul 2005
Posts: 73
merritt island fl usa
You have to laugh when you hear homeowners say yeah I got a 10hp air compressor and a 5hp shop vac.


#69671 - 09/23/06 03:47 PM Re: Motor hp and FLA  
wendel  Offline
Member
Joined: Aug 2004
Posts: 55
I don't know if they are NEMA rated. They're Emerson and GE brand names if that helps. The hp rating is from the manufacturer, not some homeowner promotional literature. Should I not trust motor data plate information on fractional hp motors?



Member Spotlight
Vlado
Vlado
Croatia
Posts: 28
Joined: February 2011
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: 0.038s Queries: 14 (0.024s) Memory: 0.7678 MB (Peak: 0.9046 MB) Zlib enabled. Server Time: 2017-10-18 14:57:01 UTC