Save money on intrinsically safe installations. How? Here are three ways:
- Use a general enclosure with intrinsically safe apparatus; permitted by 504.10(B).
- Rather than use special wiring methods, use any of the wiring methods suitable for unclassified locations when installing intrinsically safe apparatus [504.20].
- Don’t seal enclosures that contain only intrinsically safe apparatus (except as required by 501.15(F)(3)); permitted by [504.70].
- You must separate intrinsically safe conductors from nonintrinsically safe conductors [504.30(A)]. About half of Art. 504 is devoted to covering the details of how to do this.
- You must connect intrinsically safe apparatus, enclosures, and raceways (if metallic) to the equipment grounding conductor [504.50].
- Bond all metallic objects of an intrinsically safe system, per 250.100 [504.60].
- Ensure all intrinsically safe circuits are identified at terminal and junction locations in a manner that prevents unintentional interference with the circuits during testing and servicing [504.80].