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Posted by Petre on June 12, 2008, 7:37 am
Vern Heiler wrote:
> Petre, the problem is with the thickness of the flexible SST. Holes burn
> thru easily. With thick schd. 40 black iron pipe, it just makes a black
> mark on the exterior of the pipe.
I agree. I have never used flex and never will for that kind of a hook
up. The thickness makes no difference in flex such as tract pipe as many
newer homes are completely gas plumbed with it. I have been cutting
black pipe for a few decades and have no motivation to stop now. I would
be delighted to show you pictures of a real lightning strike damage on
all piping and wiring. And it certainly is more then a scorch mark.
Tesla in 1907 used to set up targets to attract lightning in order to
try and store it for future domestic usage. He had huge targets turned
to cinder. Bottom line is that flex SST is legal and there are folks
going to use it. Labor costs are low. The bottom line will rule as a
fast job gets you to other jobs. Ummmm/ want to buy some lightning rods.
Old barns used to have to replace the incinerated cabling from time to
time along with a portion of the barn. That cable is a thick as your
thumb and is a braided line. Not sure of what kind of metal content, but
it was a little flexible.
>> Vern Heiler wrote:
>>> What is the definition of "unprotected knockout"? Does that mean if
>>> there is a rubber grommet, its ok? Still would not stop lightning arc.
>> Doesn't make much difference. If you get hit by lightning , your screwed
>> anyway. Do you really think even a foot of metal is going to stop a few
>> hundred Billion volts of flash lightning? Have you ever noted the
>> aftermath of a lightning strike. Yes Virginia yous can use flex to hook up
>> a G.Furnace by the IMC. But do it right. The concern is sharp edge damage
>> and kinking is a helluva a no no.
>>
>>>>> With the problem of lightning burning thru the thin wall of CSST, and
>>>>> subsequent bonding requirements now enforced by code officials, is
>>>>> running CSST or flexible gas connectors thru the side of the furnace
>>>>> allowed by mfg's. installation inst?
>>>>>
>>>>> The practice is not a code violation in itself but mfg. instructions
>>>>> trump code.
>>>> It *is* against the manufacture's installation instructions and IMC to
>>>> run a flex line through an unprotected knockout.
>>>>
>>>
>> ** Posted from http://www.teranews.com **
>
>
** Posted from http://www.teranews.com **
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