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Posted by Cydrome Leader on July 7, 2008, 11:13 am
Please log in for more thread options > On 6 Jul 2008 22:51:26 GMT, phil-news-nospam@ipal.net wrote:
>
>
>>It is quite normal for UL tests to test for voltages at least double that for
>>which the device insulation is to be rated, and perhaps well more than that.
>
> <snippity>
>
>>UL testing procedure documents
>>are available, but have a high cost, so I have not purchased them. If you
>>really want to know for sure, you will have to part with some coin to see.
>
> So you know what is "quite normal for UL tests to test" and yet you've never
> actually seen a UL test procedure. Hmmmm. This is the perfect example of one
> of the more remarkable phenomena on the net - someone writing a wordy article
> on a topic about which he has absolutely no knowledge. In any other
> environment, most folks would simply keep the lip zipped, listen and learn.
>
> Here's a suggestion, Phil. Look up what "Basic Impulse Load" (BIL) testing
> consists of. That'll give you an inkling of just how silly your writing
> really is. You don't have to buy a UL document to learn all about BIL
> testing. You can simply go to an instrument company's website like Biddle and
> download a BIL tester's manual. While you're at it, learn about "Hi-Pot"
> testing. The same companies that make BIL testers tend to also make Hi-Pot
> testers so that shouldn't be too challenging for you to learn about both.
>
>>
>>I'm far less worried about double voltage jumping across an open breaker
>>contact than I am about the idiots that might close the breaker when the
>>utility linemen are working on the wires.
>
> Damn, did someone just turn on the WayBack machine? I thought we pretty much
> beat this topic to death just last week.
>
>>The scenario of double voltage
>>across an open breaker should not be allowed to be possible, regardless of
>>whether the breaker can withstand it or not.
>
> Really? Quite a few authorities such as UL and the NEC tend to disagree with
> you. Consider this fully approved gadget
>
> http://www.interlockkit.com/intro2.htm
Interesting device. The closest I've seen to that was a set of locks that
threw bolts in front of breakers you should not operate. To make sure you
could not operate two breakers in conflicting states, the key would stay
captive in each lock depending on whether or not the bolt it threw was or
wasn't blocking the circuit breaker paddle.
It may sound complex, but it was just a bunch of panel mount deadbolts
attached to the face of the breaker panel, far far cheaper than some weird
rotary switch.
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