Maximum length of rubber cord in Class 1 Div 1 location

[Happsie]

Can anybody help me with the use of rubber cord in a Class 1 Div 1 location. If you have a portable mixer wired with rubber cord , is there a maximum allowable length?
I can only find that the rubber cord needs to be extra hard usage, continuous and contain an equipment grounding conductor. Thank you in advance

 

[rbalex]

They are also subject to the provisions of Article 400, which usually specify physical protection requirements rather than length.

Depending on usage, Article 590 may also apply.

Essentially, begin as if the location is not classified, then apply Section 501.140.

 

[ENH]

OK, I will check it out. I recently took my exam for my electrical license and this question was on the test. I couldn't seem to find the answer