Re: NFPA 70E Training outcomes (Ref: Safety Training...)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Harold Weiss" <hweiss-at-new.rr-dot-com> 

Hi All,

I have had this problem happen!  The mains breaker oxidized and opened one
leg of my house service.  Operating the breaker a few times resupplied
power.  The breaker hadn't been operated in 20+ years.  As I'm about to have
some new wiring installed, I'm having it replaced as well as a few other
breakers.

David E Weiss


 > Original poster: Sparktron01-at-comcast-dot-net
 >
 >
 > 5.  Circuit breakers should be mechanically exercised ONCE A YEAR.  This
 > was a revelation to me, but with our TC's of various flavors pounding our
 > house panels, please take heed.  The CB mechanism can be uncalibrated by
 > extended time running at 90-95% of breaker ampacity by internal
 > heating.  This may preclude the breaker from operating at all.  If you
 > operate the breaker and it does not "feel" right, or sounds "mushy" when
 > the contacts open and close; REPLACE THE CB.  It is cheaper then replacing
 > your house!
 > Regards
 >
 > Dave Sharpe TCBOR/HEAS, Chesterfield, VA. USA
 >
 >
 >
 >
 >