On Thu, 02 Jul 2020 15:41:19 +0100, Ralph Mowery <rmowery28146@earthlink.net> wrote:

> In article <rdjsa6$28b$1@reader1.panix.com>, presence@MUNGEpanix.com
> says...
>>
>> Have you run this test with AC? That seems to be where the wheels come
>> off. I brought up this thread to a friend and he mentioned his quest to
>> repair some sort of HP true RMS meter that uses a thermocouple and heater
>> to properly measure complex waveforms. I can't even guess how slow such a
>> meter might be.
>>
>> > I had 3 or 4 of the Harbor Freight 'free' multimeters. The ones that
>> > usually sell for around $ 5. They seem to be reasonable accurate for
>> > the money. Plenty accurate for the home user to test things around the
>> > house. I do admit that the safety issue of putting them across the 120
>> > or 240 volt power wires is somewhat doubtful. I sure would not use one
>> > where I worked to put across the 480 volt 3 phase system that is fused
>> > with 200 amps.
>>
>> I'm pretty timid with anything upstream from a plain outlet. I had an
>> edison base fuse burst in my hand once. Never seen one come apart before.
>> It was just a 120v lighting circuit, but right off the service panel.
>> There's way more excitement near those things.
>>
>>
>
> I have not ran any tests for AC . The things I work with don't care
> about very much about being accurate to more than around 5 %. Usually
> it is more of do I have a voltage/current or not.
>
> When I work on most anything other than low voltage (below 100 volts) I
> ues either my Simpson 260 analog meter or a Fluke meter that is rated
> for cat 3 and 4. If you have not heard of the Cat numbers, they are for
> devices used in different power circuits.

Yes I've heard of them, they're a measurement scale for pansies.

> I don't know the numbers off
> hand, but it goes something like this, Cat 1 is for low voltage items,
> Cat 2 for things like stoves and refrigerators, Cat 3 for homw
> wiring,and Cat 4 for the very high power circuits like I often worked on
> like the 480 volt AC and 300 amps.
>
> For a real scare you should see some of the safety movies that Fluke put
> out. They show under test conditions what can hapen to inexpensive
> meters and their meters under different conditions like having the
> meter set for amps and putting across a 480 volt circuit that has plenty
> of amps .

Safety movies designed to sell Fluke meters, and you fell for them hook line and sinker.

In article <op.0nu3kdf9wdg98l@glass>, CFKinsey@military.org.jp says...
>
> Safety movies designed to sell Fluke meters, and you fell for them hook line and sinker.
>
>

No, I have actually seen a few blowups and the results of some others.

Have you ever worked at a place that has lots of 480 volt 3 phase
equipment ? I did before retiring. One learns to respect what can
hapen.

He is just an arc flash away from making an ash of himself.

On Thu, 16 Jul 2020 21:03:04 +0100, Ralph Mowery <rmowery28146@earthlink.net> wrote:

> In article <op.0nu3kdf9wdg98l@glass>, CFKinsey@military.org.jp says...
>>
>> Safety movies designed to sell Fluke meters, and you fell for them hook line and sinker.
>>
>>
>
> No, I have actually seen a few blowups and the results of some others.
>
> Have you ever worked at a place that has lots of 480 volt 3 phase
> equipment ?

Yes.

> I did before retiring. One learns to respect what can hapen.

I've seen what happens when you connect two phases to one phase equipment, it's quite amusing.

And I don't respect things that will probably never happen.

On Thu, 16 Jul 2020 21:13:11 +0100, Michael Terrell <terrell.michael.a@gmail.com> wrote:

> He is just an arc flash away from making an ash of himself.

I've done that actually, just scorched my hand for a couple of weeks.

In article <op.0nvd9pimwdg98l@glass>, CFKinsey@military.org.jp says...
>
> > He is just an arc flash away from making an ash of himself.
>
> I've done that actually, just scorched my hand for a couple of weeks.
>
>

If you had respected things that probably would never hapen, you would
not have scorched your hand.

On Fri, 17 Jul 2020 04:29:38 +0100, Ralph Mowery <rmowery28146@earthlink.net> wrote:

> In article <op.0nvd9pimwdg98l@glass>, CFKinsey@military.org.jp says...
>>
>> > He is just an arc flash away from making an ash of himself.
>>
>> I've done that actually, just scorched my hand for a couple of weeks.
>
> If you had respected things that probably would never hapen, you would
> not have scorched your hand.

You miss the point, it's not the end of the world.

Commander Kinsey <CFKinsey@military.org.jp> wrote:
> On Fri, 17 Jul 2020 04:29:38 +0100, Ralph Mowery <rmowery28146@earthlink.net> wrote:
>
>> In article <op.0nvd9pimwdg98l@glass>, CFKinsey@military.org.jp says...
>>>
>>> > He is just an arc flash away from making an ash of himself.
>>>
>>> I've done that actually, just scorched my hand for a couple of weeks.
>>
>> If you had respected things that probably would never hapen, you would
>> not have scorched your hand.
>
> You miss the point, it's not the end of the world.

A scorched hand, no, not the end of the world.

A stopped heart, which *can* happen if the arc flash conducts enough
current through the wrong part of the body, well then for the one who's
heart just got stopped it might just be the end of the world.

On Fri, 24 Jul 2020 23:58:41 +0100, Rich <rich@example.invalid> wrote:

> Commander Kinsey <CFKinsey@military.org.jp> wrote:
>> On Fri, 17 Jul 2020 04:29:38 +0100, Ralph Mowery <rmowery28146@earthlink.net> wrote:
>>
>>> In article <op.0nvd9pimwdg98l@glass>, CFKinsey@military.org.jp says...
>>>>
>>>> > He is just an arc flash away from making an ash of himself.
>>>>
>>>> I've done that actually, just scorched my hand for a couple of weeks.
>>>
>>> If you had respected things that probably would never hapen, you would
>>> not have scorched your hand.
>>
>> You miss the point, it's not the end of the world.
>
> A scorched hand, no, not the end of the world.
>
> A stopped heart, which *can* happen if the arc flash conducts enough
> current through the wrong part of the body, well then for the one who's
> heart just got stopped it might just be the end of the world.

It seldom travels that path.