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Corrosive enviroment #178632 06/07/08 04:50 AM
Joined: Oct 2002
Posts: 49
J
JuddsAirco Offline OP
Member
This is why galvanized locknuts are not good around sulphuric acid.

[Linked Image from electricalphotos.com]


The lesson is in the struggle, not the victory.
2017 / 2014 NEC & Related Books and Study Guides
Re: Corrosive enviroment [Re: JuddsAirco] #178638 06/07/08 10:36 AM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Member
Actually, I think those were the lightweight zinc locknuts. Steel ones would have lasted a bit better, as suggested by the lack of rust on the body of the connector.

Part of that can be attributed to the zinc sacrificing itself to protect the steel .... a principle every boater is familiar with.

I note that both pieces of flex have pulled free. This suggests that they need some additional support - or were simply too short from the start.

It's a critical part of an electrician's job to judge the environment. The code does require that equipment be suitable, both for corrosion resistance as well as mechanical damage; these factors may require you to do things a bit different that "the way we've always done it."

Even Chicago, which wants to see nearly everything in steel pipe, and does not recognize PVC pipe or romex as wiring methods, will allow the use of PVC where corrosion is an issue. Indeed, in appropriate circumstances (in my experience), Chicago will allow an exceptional amount of creativity in meeting the threat.

BTW, if you do find yourself working in a corrosive environment, it will help you greatly if you coat your threads with Noalox, or a similar product. This will keep everything from rusting together - and is even listed for that use.

Re: Corrosive enviroment [Re: renosteinke] #178653 06/07/08 10:48 PM
Joined: Feb 2004
Posts: 1,437
Lostazhell Offline
Member
Crouse-Hinds STL8

This stuff is wonderful if you ever want to be able to unscrew something 6 months+ later where corrosion will happen (We use it on explosion proof J box caps, pipe threads, device screws, etc...)

[Linked Image from electricalphotos.com]


CU-AL gel is sooo much easier to use than Noalox, not to mention CUAL isn't flammable and it will come off your hands, clothes, etc.... cool

Re: Corrosive enviroment [Re: renosteinke] #178654 06/07/08 10:49 PM
Joined: Oct 2002
Posts: 49
J
JuddsAirco Offline OP
Member
Rust is not a problem here, unless it is stainless or poly it has a very short lifespan. For instance here is a pic of a 3/8 bolt i replaced yesterday with a stainless one. This used to be a new black oxide coated bolt just a little over a month ago. The rust here is just where i washed it off yesterday.
[Linked Image from electricalphotos.com]


The lesson is in the struggle, not the victory.

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