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IAEI Magazine | Author: Benjamin P. Schaefer
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Benjamin P. Schaefer

Benjamin Schaefer, a 17-year veteran of UL, is a primary designated engineer for intrinsically safe equipment and systems. In addition to intrinsically safe equipment, he has worked with explosion-proof and nonincendive equipment. He is a delegate to the IEC SC 31G subcommittee on intrinsic safety and is a member of the IEC SC 31G MT4 maintenance team for intrinsic safety, and is also a member of the ISA S12.06 subcommittee for Wiring Practices for Hazardous (Classified) Locations.


Installation of Intrinsically Safe and Nonincendive Systems

With technology rapidly advancing, new developments in sensing and process control have increased the number of products using intrinsically safe or nonincendive circuits as their protection technique for hazardous (classified) locations as defined in Articles 500 through 505 of the 2002 National Electrical Code ANSI/NFPA 70 (NEC)1. With lower installation and maintenance costs, these protection techniques have found increased favor in applications traditionally requiring explosionproof devices. Though these concepts have been in use in industry for many years, some confusion still exists in regards to the installation of these devices. Following the proper installation requirements is important to the overall safety of intrinsically safe and nonincendive circuits.