This article is about Explosion Proof Flexible Metal Couplings Material Selection Guide & Technical Specification for commercial buildings, plants and refinery projects as per international codes and standards. EXP Flex couplings shall be listed as meeting the requirements of UL 886.
Explosion Proof Flexible Metal Couplings Material Technical Requirements
| A flexible fitting shall have a length of flexible central section of not more than 36 inches (0.9 m). [UL886 Sec. 11.1] |
| A flexible fixture fitting shall be provided with a setscrew in a connector having internal conduit threads. [UL 886 Sec. 11.2] |
| New and Unused – Electrical materials shall be new and unused. |
| As Designed – Electrical materials shall be in accordance with the Saudi Aramco-approved project-specific design drawings, diagrams, schedules, lists, databases, and associated documents (in particular, raceway type and trade size as shown on electrical BOM and raceway schedules). |
| Free of Damage – Electrical materials shall be free of damage. |
| QC Before Installation – Electrical materials shall conform to all applicable requirements, standards, and specifications prior to release to be used as part of the work. |
| Identification – Electrical materials shall be identified by using tags, stamps, color coding, stencils or labels. The location and method of identification shall not affect the function or quality of the materials. |
| Traceability – Electrical materials shall be traceable from the manufacturer and supplier through delivery, storage, fabrication, erection, installation, repair, modification and use. |
International Codes and Standards for Explosion Proof Flexible Metal Couplings
| 3. UL 886 – UL Standard for Safety for Outlet Boxes and Fittings for Use in Hazardous (Classified) Locations, February 1994 |
| 4. SAES-P-104 – Wiring Methods & Materials, January 2008 |
| 5. SAES-P-100 – Basic Power System Design Criteria, June 2007 |