ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
sparky 5
Recent Posts
Permit Snafus...AHJs and Contractors Jump in
by sparky. 04/29/17 05:59 PM
201 volt equipment?
by bigpapa. 04/29/17 12:15 AM
Schneider LC1D09
by jraef. 04/28/17 11:05 PM
Electrode boilers question
by annemarie1. 04/27/17 01:40 PM
Why cables look like they do
by LongRunner. 04/26/17 09:36 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
235,015 Are you busy
169,862 Re: Forum
163,052 Need opinion
Who's Online Now
0 registered members (), 68 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#15418 - 10/17/02 08:40 PM 240v/120v transformer  
moe707  Offline
Junior Member
Joined: Sep 2002
Posts: 3
Bay City, MI, USA
Today, we had a transformer on one of the punch presses explode. The press was not running but we had the panel disconnect switch on only. No other controls were on.
Is this normal for the transformers to explode with time on their own? or do we have an underlaying problem that may cause the same again. The press control panel was wired three years ago.

Thanks for the reply

Work Gear for Electricians and the Trades

#15419 - 10/17/02 08:52 PM Re: 240v/120v transformer  
HotLine1  Offline

Joined: Apr 2002
Posts: 6,811
Brick, NJ USA
Since the disconnect was "on" apparently the transformer was energized. Are you refering to a "Control transformer"?? Was the transformer primary protected by the correct fuses?? Was the secondary protected by the correctfuses??? Was there any evidence of overloading, overheating prior to the exp??
The usual "destruction" I have encountered is the primary or secondary windings either "short" or "open". The "short" scenario can be rather destructive without primary and/or secondary protection.


#15420 - 10/17/02 09:07 PM Re: 240v/120v transformer  
Trainwire  Offline
Joined: Mar 2002
Posts: 360
Double check your input voltage, I have had them let go, though not that violently, after a few years, found out that the input voltage was wrong. The guy before me tapped it one side off of the high leg of a 3 phase panel.

somethin' to check

#15421 - 10/17/02 09:07 PM Re: 240v/120v transformer  
moe707  Offline
Junior Member
Joined: Sep 2002
Posts: 3
Bay City, MI, USA
Hi John:

It is a control transformer. the primary and the secondary are properly fused. The press was not on for the past five days at least. The only thing we had on today is the disconnect. The transformer was the only control energized. All other relays, solenoid valves were off.


Member Spotlight
Posts: 47
Joined: March 2008
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.011s Queries: 14 (0.002s) Memory: 0.7597 MB (Peak: 0.8905 MB) Zlib enabled. Server Time: 2017-04-30 14:45:44 UTC