bubu
New User
- Location
- Pittsburgh
- Occupation
- Engineer
Hello,
First of all, I'm mostly used to the European standards, so bear with me if this is a silly question.
I'm involved in a project where the contractors are wanting to replace the components within a certified Exd enclosure. Basically there's a little lcd display that they want to replace with an led one that can be networked rather than the RS485 one they have.
In Europe this is a no go since there's things like the temperature rating and the available internal volume which will be affected by the modification, but I'm told this isn't a concern when it comes to NFPA/UL requirements and I find it slightly odd. I don't have access to the UL1203 to understand the requirements but was wondering if someone can shed some light on this?
First of all, I'm mostly used to the European standards, so bear with me if this is a silly question.
I'm involved in a project where the contractors are wanting to replace the components within a certified Exd enclosure. Basically there's a little lcd display that they want to replace with an led one that can be networked rather than the RS485 one they have.
In Europe this is a no go since there's things like the temperature rating and the available internal volume which will be affected by the modification, but I'm told this isn't a concern when it comes to NFPA/UL requirements and I find it slightly odd. I don't have access to the UL1203 to understand the requirements but was wondering if someone can shed some light on this?