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

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

Original poster: "Michael Brooks" <mbrooks-at-perrytech.edu> 

Thought I would interject a tidbit here,
Something to consider when dealing with circuit breakers (and fuses for
that matter) is the AIC rating of the panel, CB and related components.
While this is not generally considered a major concern in most standard
houses, the larger toys coilers play with may warrant some consideration
in this area.
Cooper Bussman has a terrific book on AIC... I will dig up the website
and attach it later.


Michael Brooks
Instructor
Perry Technical Institute
mbrooks-at-perrytech.edu
509 453 0374 xtn 234


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, August 26, 2004 11:30 AM
To: tesla-at-pupman-dot-com
Subject: Re: NFPA 70E Training outcomes (Ref: Safety Training...)

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
  >
  >
  >
  >
  >