The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
International Wire Colour Codes
by Tjia1981
Yesterday at 09:09 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
230 or 345 kV transmission lines?
by annemarie1
10/12/16 01:23 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 11
HotLine1 6
renosteinke 6
ghost307 5
Potseal 4
Who's Online
0 registered (), 159 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#47761 - 01/26/05 04:55 AM Oversized Buck-boost?
Redsy Offline

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
I am working with a 7 1/2 HP Air Compressor motor.
It is 240V 28A 1Ph.
The system voltage is 208.
Someone installed a 3kVA Buck-Boost, but the website for Jefferson Electric (transformer manufacturer)lists a 1kVA unit (minimum) for a 7 1/2 HP motor.
I don't see a problem with an oversized unit, but am not sure.
Anyone have any insight?


Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#47762 - 01/26/05 05:59 AM Re: Oversized Buck-boost?
winnie Offline

Registered: 09/15/03
Posts: 652
Loc: boston, ma
I see no significant safety or functionality issues with a larger buck-boost. It might even provide better motor starting.

The larger core will mean more core losses over the life of the unit, even when the air compressor is off.



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals