Continuously Flexible Cable for Class 1 Division 1

M

mheckmann

Member
Location
Salt Lake City, UT
Occupation
Controls 'Engineer'
Hello friends!

I have a project in the submittal phase that will be installed in a C1 D1 Group D environment. Its basically a traversing overhead crane.

We have a solution specified to provide power and signal to the crane that seems like it may not be accepted by the customer as its not PRECISELY rated for C1 D1, but is ATEX rated (sigh).

My question is - what the heck to other folks use in C1 D1 environment when they need to get power to a hoisted crane? Very hard to find anything commercially available.

The code is pretty silent when it comes to continuously flexible cabling in C1 D1.
 
@rbalex this section does not address cabling specifically designed for continuously flexing applications. The cables that meet the requirements in this section are not appropriate for installation in an energy chain, for example. Am I misunderstanding the scope of this section?
 
Section 501.140 (A)(2) appears to describe your situation’s requirement. Section 501.140 (B) describes the installation. The cable is not required to be specifically marked for a classified location.

See Section 500.8(A) for suitability.
 
Okay, right. The code isn't calling for any specific type of cable here, except for in section 501.140 (B): "1. Be of a type listed for extra-hard usage".

And in Section 500.8(A) we see item (3) which would be used to justify the application of an ATEX rated item in a Class 1 Div 1 environment.

After doing a little reading it looks like being "listed for Extra-Hard Usage" just means the cable jacket has to be a certain thickness. Is this right?
 
Section 500.8(A)(3) might work. But remember ATEX marking means nothing in US domestic Standards. The marking would need to be “AEx” not just “Ex”[Section 505.9(C)(2)(3)] to meet the requirements of Section 501.5. NRTL Listed as extra-hard usage should work.
 
You must log in or register to reply here.
Top