Class 1 Division 1 24 VDC On/Off Switch

Check a marine store. Their battery disconnect switches are sealed, suitable for below decks in engine rooms.

24VDC allows many more options to choose from, I find it hard to believe you couldn't find anything. Just about any Cl1Div2 switch will work, including reed contacts on a standard industrial pilot device.

Improve your search skills you must. Difficult this isn't.

Jraef,

Class 1 Division 2, is not equal to Class 1 Division 1. I find Crouse Hinds, Appleton, ABB, Pauhluhn and others with switches rated as high as 600VAC, no 24 VDC.

You comment that you find that hard to believe, please do me a favor and prove me wrong.

"You comment that you find that hard to believe, please do me a favor and prove me wrong."

Allen Bradley 800R pilot devices.

Search About 90,800 results (0.35 seconds) http://www.ab.com/en/epub/catalogs/12768/229240/229244/2531085/229753/Introduction.html

Oh wait, I'm sorry, I took advantage of the fact that I already knew where to look.

Try this, it's like starting from scratch.

Search About 90,800 results (0.35 seconds)

Jraef,

Thank you, close but no cigar.The sites were all for Class 1 Division 2 switches. Class 1 Division 1 switches required.

The application is for Emergency Shutdown of (4) diesel engine driven pumps on an oil barge.

The diesels are below decks. The e-stops are above deck in the open. The USCG classes the e-stop locations as being in a Class 1 Division 1 Hazardous Location.

Class 1: Petroleum Gases Present. Division 1: Under Normal Conditions, gases present. (Division 2: Under Abnormal Conditions, gases present).

600VAC is a maximum, not a target!

Thank you Mike. Per USCG, IP 22 ,Dripproof, is the accepted enclosure rating for ships machinery spaces above the floorplates and IP 44, NEMA 4, below the floorplates.

OK, you're right, I somehow kept reading what I wanted to read as opposed to what it actually said.

But... on that same page:

"The complete stations and individual components listed herein are NOT suitable for use in Class I and II Division 1 hazardous locations. For Class I and II Division 1 hazardous locations, order Bulletin 800H Type 7 & 9 stations and units."

Look I know I'm sounding like a snobby know-it-all, but I'm honestly trying to help. I was wrong about the hermetically sealed contacts being suitable all by themselves, but still, the issue is that if you look carefully asnd thoroughly, there are options available for Cl 1 Div 1 applications using commnly available INDUSTRIAL products.

"Bulletin 800H/Hazardous Location Push Buttons

Build a Catalog Number

• Hazardous locations push buttons and stations
  
• Classes I, II & III Divisions 1 & 2
  
• 3/4 in. - 14 NPSM barrel
  
• Type 7 & 9
  
• Explosion-proof operators
  

Desription

Application

When properly mounted in a Type 7 & 9 enclosure, Bulletin 800H Type 7 & 9 operators are designed to meet the requirements of the National Electrical Code for Class I, Divisions 1 & 2, Groups B, C & D Hazardous Gas; Class II, Divisions 1 & 2, Groups E, F and G Hazardous Dust; and, Class III Hazardous Fiber Locations. In addition, the single gang shallow base, Cat. No. 800H-IHZX7, meets Class I, Group B requirements. This Type 7 & 9 equipment is listed by Underwriters Laboratories, Inc.
Per National Electrical Code:
Zone 1. In Class I, Zone 1 locations, all wiring methods permitted for Class I, Division 1 locations and Class I, Zone 0 or Zone 1 locations, including requirements for sealing, shall be permitted.
Zone 2. In Class I, Zone 2 locations, all wiring methods permitted for Class I, Division 2, Class I, Division 1 or Division 2, and Class I, Zone 0 or Zone 1 locations, including requirements for sealing, shall be permitted. "

These use either standard contacts or if you like, you can ALSO use the hermetically sealed versions, it's external operating mechanisms and the box that meets Division 1 requirements. The contact blocks are rated NEMA A600 (600VAC rating) and NEMA Q600 or P300, the DC ratings, which goes down to 24VDC.

Find a Coal Mining Supply Company you will get one there

merc600sec.

Thank you.

John,

The requirement in Class1,Div1 areas is ideally an IS (intrinsically safe) certified device. However, a switch is a passive device (doesn't draw current), and you will waste time searching for same....

IS circuits limit the amount of current available in the hazardous area, such that a ignitive spark cannot occur, while the Explosion protected device, by virtue of it's build and flame path cooling, prevents any such spark reaching the hazardous atmosphere.

Therefore, you are not going to find an IS switch. An earlier comment you got re: 'coal mine supplier' is good.

John,

It could be that 24VDC meets the "intrinsically-safe" design criteria for Class 1 Div 1 and is therefore listed differently.

We have several locations where the fire protection sensors and level detectors are operating at 24 VDC in Class 1 Div 1 locations. (fuel docks, fuel storage, fuel pump skids, etc.)

The wiring methods used on these 24 volt devices is quite different than the higher voltage equipment in these systems with no "seal-off' required on field devices other than in the conduit within 18 inches of the control/relay panel.

Take a look at some of the fire protection equipment and/or fuel dispensing equipment vendors and you most likely will find something that will work.