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
Parking lot pole light swap....
by gfretwell
10/24/16 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 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
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
1 registered (Webmaster), 303 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#13465 - 09/04/02 07:39 PM Transformer field test
scjohn Offline

Registered: 07/04/02
Posts: 76
Loc: charleston, SC, USA
Bidding a job with an older exisiting 480-277/208-120, 112.5 kva transformer is to be used. The specs. ask for a field test to be performed to see if the xfrmr is functionig properly before submitting a bid. Problem is there is no power to the building. Is there anyway to test the unit without powering it up??
Thanx, John.

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....

#13466 - 09/04/02 08:36 PM Re: Transformer field test
George Corron Offline

Registered: 05/16/01
Posts: 728
Loc: Lorton, Va USA
Megger test, TTR (Transformer turns ratio) can be performed prior to energizing. Most any testing company performs these tests on a normal basis.

#13467 - 09/04/02 09:36 PM Re: Transformer field test
TE Offline

Registered: 08/26/02
Posts: 37
Loc: USA
If you don't have the equipment and aren't familiar with the procedures, I would definitely do as George suggests and have a testing co preform the checks.

However, I wouldn't incurr these costs at the bid stage as they suggest. I would include the cost to test in my bid and state the additional cost to replace the xfmr should it fail at the bottom of my proposal.


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