Listed Wireway vs Mechanical Protection

[markmedici]

When installing electrical power distribution and control for industrial equipment we use a lot of "Listed" products such as duct, tray, wireway, and conduit as required by the NEC.
Then comes a long Peterson Bumble-Bee and other similar "mechanical protection" systems that are marketed directly at those products for industrial use but carries no "Listing" for that use. If I can use this product on the factory floor without a "Listing", why does any product need to be "Listed" as wireway, duct, or tray? What additional cable requirements must be followed to use these products?
If I can use the product I will use it, but not if it's use violates the NEC.

 

[barbeer]

Could the "temporary" nature of this product not require extensive testing/listing procedures? I would use it, I do not believe it violates the NEC.

 

[markmedici]

Thanks for the quick reply.

When you say temporary, I suspect you're thinking a few days or weeks. This product is proposed for automotive manufacturing areas that are installed and operated for 4 -6 years before teardown.
I have seen products like this used in carnivals or trade shows for temporary use, but this is not the case.

Since it does not have a listing, it opens pandoras box of using anything that implies protection.

 

[jim dungar]

...why does any product need to be "Listed" as wireway, duct, or tray? What additional cable requirements must be followed to use these products?
If I can use the product I will use it, but not if it's use violates the NEC.

Actually, there are very few areas of the NEC that require products to be listed (some local codes are more severe). In general listing is simply a means to allow the AHJ to 'easily' accept something rather than having to perform their own evaluation.