×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

60079-11: Intrinsic Safety: I have 24V and 200mA, which is Pin=4.8W, what is P = Vo*Io / 4 equation

60079-11: Intrinsic Safety: I have 24V and 200mA, which is Pin=4.8W, what is P = Vo*Io / 4 equation

60079-11: Intrinsic Safety: I have 24V and 200mA, which is Pin=4.8W, what is P = Vo*Io / 4 equation

(OP)
I come across the equation P = Vo*Io / 4

(1) I have 24V and 200mA AC/DC PSU into Zone 2 sealed case (IP67) with electronics and barrier modules for sensors attached to pipes. This is 4.8W, but I come across a weird equation P = Uo * Io / 4, what are they?

(2) What kind of barrier to use between external AC/DC adaptor to the above box, how short the 110V main cable should be. It would be placed in the Zone 2 area (ie Dog House).

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close