Article 500

[Djelite]

Article 500 states that when using explosion proof fitting and imc rmc you need 5 full threads to engage or 4.5 threads if its factory threads. Does this also apply to no explosive fittings with imc rmc?

 

[rbalex]

I’m assuming you are citing Subsection 500.8(E)(1) and its Exception. Reread it in context of the master Section [500.8(E)].

 

[Djelite]

Thank you but the question was if the 5 threads on rmc imc applied to application all other-applications other than article 500 and explosion proof connectors.

 

[rbalex]

I understood your question - did you understand that the 5 (or 4.5 Exception) thread engagement only applies to explosionproof entrances. Other threaded connections are required to be “wrenchtight” per Section 500.8(E). Technically, “wrenchtight” applies to 5 or 4.5 engaged threads too; the minimum required number of engaged threads is an additional requirement for explosionproof entrances. That’s what I meant by reading Subsection 500.8(E)(1) in context of 500.8(E).

 

[rbalex]

After rereading and ruminating on your first response, I realize I indeed may not have understood your actual question. In that case, I point you to Section 500.1 which indicates the requirements of Article 500 are only strictly applicable to Articles 500 to 504. If the thread engagement requirements were general for RMC/IMC, they would appear in Articles 344 or 342 respectively.