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Auto Shop #2 - more Horrors .... #109911
01/01/06 02:54 PM
01/01/06 02:54 PM
Admin  Offline
OP
Administrator
Member
Joined: Oct 2000
Posts: 3,481
NY, USA
Quote
Building on a thread started by "Lotsahell," here are the first pics from a transmission shop I'm currently working on.

The first pic is of the starter open; as you can see, this is a single-phase unit.
[Linked Image]
Quote
The second pic shows the box feeding the com[pressor, as I found it. Please note the absense of either a cover or disconnecting means. Not so obvious is that there are three large wires, plus a ground wire, going to the compressor. This is one wire more than is neede for a single phase unit.
[Linked Image]
Quote
A look behind the unit (pic 3) shows what happened to the lost phase- it was simply capped off at the flying splice.

- renosteinke
[Linked Image]

2017 / 2014 NEC & Related Books and Study Guides
Re: Auto Shop #2 - more Horrors .... #109912
01/02/06 10:02 PM
01/02/06 10:02 PM
Lostazhell  Offline
Member
Joined: Feb 2004
Posts: 1,431
Bakersfield, CA (Originally Or...
why do I get the feeling that all of this tomfoolerly is outside for the weather to wreak more havoc on than already exists.... [Linked Image] Some people just shouldn't be allowed contact with more than 12V!

PS. nice pics John.. [Linked Image]

-Randy

Re: Auto Shop #2 - more Horrors .... #109913
01/02/06 11:55 PM
01/02/06 11:55 PM
M
mahlere  Offline
Member
Joined: Nov 2005
Posts: 507
New Jersey
ironically, NJ passed a law that a license is required for anything over 10v.

not sure if it's being enforced though.

Re: Auto Shop #2 - more Horrors .... #109914
01/03/06 03:23 PM
01/03/06 03:23 PM
C
chipmunk  Offline
Member
Joined: Jul 2004
Posts: 144
Southampton, UK
Quote
ironically, NJ passed a law that a license is required for anything over 10v.

That would be a good idea in some cases, 12v from a car/truck battery can do a lot of damage, but that would cover phones too (Unless there's a specific exclusion). The phone companies however might think that was a good idea [Linked Image]

Re: Auto Shop #2 - more Horrors .... #109915
01/03/06 06:43 PM
01/03/06 06:43 PM
R
Rewired  Offline
Member
Joined: Jan 2006
Posts: 558
Hamilton, Ontario, Canada
Yep, 12V is "safe" but when you have a few hundred amps availible and ya' short across it, things kind of get a bit hot let alone all the 'pirty sparks.. Very easy way to say start your car---> on fire. ( seen it)
Telephone?? Get your buddy to work on it.. If they don't feel the 50V D.C present, CALL THEM... See if they feel the 90V A.C "ring" [Linked Image]

Re: Auto Shop #2 - more Horrors .... #109916
01/07/06 09:53 PM
01/07/06 09:53 PM
Theelectrikid  Offline
Member
Joined: Apr 2004
Posts: 810
Levittown, PA
"why do I get the feeling that all of this tomfoolerly is outside for the weather to wreak more havoc on than already exists.... Some people just shouldn't be allowed contact with more than 12V!"

If you ask me, some people shouldn't be allowed to touch a "AA" battery!

Ian A.


Is there anyone on board who knows how to fly a plane?
Re: Auto Shop #2 - more Horrors .... #109917
01/08/06 10:04 AM
01/08/06 10:04 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Quote
Yep, 12V is "safe" but when you have a few hundred amps availible and ya' short across it, things kind of get a bit hot let alone all the 'pirty sparks..


Definitely. So many times I've heard comments like "Oh, it's only a low voltage, it can't do any harm."

In the communications facility where I worked years ago we had the usual DC busbars running around above the racks for power. There were the usual 50V telephone equipment supplies, and we had a separate 28V distribution system for some of the satellite equipment. Some folk wouold scoff at the fuses and protection on that 28V system, but those busbars were fed from one heck of a big battery bank. The short-circuit current would have been well into the four-digit range, possibly even five.

At one point on the floor underneath the busbars was a patch where you could still see the burn marks from a slip made some years earlier. Apparently somebody accidentally dropped a wrench while working above on the cable trays and it bridged the bars as it fell. Needles to say, it was no longer usable for its intended purpose! [Linked Image]

Re: Auto Shop #2 - more Horrors .... #109918
01/08/06 06:15 PM
01/08/06 06:15 PM
W
wa2ise  Offline
Member
Joined: Nov 2002
Posts: 785
Oradell NJ USA
Quote
Some folk wouold scoff at the fuses and protection on that 28V system, but those busbars were fed from one heck of a big battery bank. The short-circuit current would have been well into the four-digit range, possibly even five.


I've heard stories about wedding rings and car batteries. That one needs to remove the ring before working with such batteries. Else you could literally burn your finger off from the heat of the fault current thru the ring from +12V to ground.... [Linked Image]

Once had a boss who had an ivory wedding ring (non-conductive material) to avoid this hazard, as well as any wayward smaller hot wires accidently getting under the ring to make a "good" connection to his body for a shocking experience. [Linked Image]

Re: Auto Shop #2 - more Horrors .... #109919
03/06/06 10:42 PM
03/06/06 10:42 PM
Admin  Offline
OP
Administrator
Member
Joined: Oct 2000
Posts: 3,481
NY, USA
Quote
Here is a pic of the compressor after I re-wired it.

- renosteinke
[Linked Image]

Re: Auto Shop #2 - more Horrors .... #109920
03/07/06 06:55 AM
03/07/06 06:55 AM
I
IanR  Offline
Member
Joined: Dec 2004
Posts: 328
Palm Bay FL USA
Well, that looks much more respectable [Linked Image]

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