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Re: [Shop-talk] Thermo Imaging camera

Subject: Re: [Shop-talk] Thermo Imaging camera
From: John Innis <>
Date: Wed, 8 Jan 2014 13:18:19 -0600
Cc: shop-talk <>
References: <>
Remember that all breakers (even brand new, good units) will run warmer
when the have increased current flowing through them,  What you are looking
for are any breakers that are getting too hot.  I was told that 55C is a
good limit for this application.  If the actual temp of the breaker is less
than 55C, it's probably fine, more than that it should be replaced.  But
you should also use some common sense here.  If you have a circuit that is
only drawing 10 amps, and it is heating the breaker to 50C, that is highly
suspicious.  If you have a circuit pulling 90amps, then 50C is probably

On Wed, Jan 8, 2014 at 12:38 PM, <> wrote:

> OK, so I finally sprung for a Thermo Imaging camera.  (FLIR E4.)
> Its really simple to use.  I wanted it do find insulation links and other
> stuff.
> One of the things I wanted to do was checking circuit breakers to find
> ones that are about to fail.
> I checked my box and I found two that are running much hotter then the
> others.
> My question is, does this mean that they need to be replaced or is there
> other testing that I should do on them first?
> One other question, are there other things I should use this camera for
> also?  Any ideas?
> Thanks in advance.
> Eric P
> "Be as beneficent as the sun or the sea, but if your rights as a rational
> being are trenched on, die on the first inch of your territory." Ralph
> Waldo Emerson
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