Contact US

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

Class 1 Div 1 requirements and testing protocols

Class 1 Div 1 requirements and testing protocols

Class 1 Div 1 requirements and testing protocols

Good day. I have researching online for a good source that can guide me on the development of me product to be tested and proven safe for a Class 1 Div 1 environment.

The product will be powered by a litium ion 3.6 volt, 2,200 Mah hour battery.

The battery will power a chip that will step of the voltage to 5 volts to power a logic chip.

There will be a sealed three position switch for turning it on an off.

Everything will be contained inside a water tight encolsure.

So, questions.

1. Is there a guideline for voltages that can be in a class 1 div 1 area that do not require testing?
2. Are there companies out there that do this type of testing and if so, can you recommend one?

Many thanks.


RE: Class 1 Div 1 requirements and testing protocols

Hi Bill,

If your product is to be employed in the US --

If you're going the explosion proof route, you'll need a copy of UL 1203. If you're trying for intrinsically safe, you'll need UL 913.

You'll need testing, since your device does not qualify as "simple apparatus," which in and of itself neither stores nor produces energy.

UL can do the testing, of course, and so can Factory Mutual. A great number of others can also do it for lower prices -- METLAB, ETL, etc... See https://www.osha.gov/dts/otpca/nrtl/nrtllist.html for a US list.

You'll need to deal with different standards and different "notified bodies" if you're looking into other markets outside the US. If so, wait for a bit and you'll get more responses from those abroad.

Good luck with your project, and let us know how it works out!

Best to you,

Goober Dave

Haven't see the forum policies? Do so now: Forum Policies

RE: Class 1 Div 1 requirements and testing protocols

For the rest of the world you'll need IEC 60079; UL works with this standard too.

After you pick your approach to Class 1 Div 1 (intrinsically safe (IS), flameproof, pressurized, powder filled, etc.), you'll need the safety aspects documented fully before you get it certified. The acceptable voltages vary with the approach. From my first C1D1 project I learned that UL will be happy to take your data and your money for a preliminary review, and wait then about 14 weeks before they will tell you that it won't pass with only cursory reasons why; they won't help you fix it. If you haven't done this before you'll save a lot of time and effort by hiring a consultant/engineer who specializes in C1D1 to take this to the regulatory body for you. If you go IS then expect circuit changes to add the protection circuitry. Let me know if you are looking for a recommendation.


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


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