Plant Services - September 2007 - (Page 25) WHAT WORKS eral areas in the system were rated Hazard/Risk Category 4 or above, meaning anyone working on it must wear multiple layers of flame-resistant clothing and other specialized equipment, even for minor work like a lockout/tagout procedure. The analysis made a series of recommendations for making the electrical distribution system safer and more efficient. Work was performed by Square D Field Services and Tirone Electric Inc., Hollywood, Fla. The existing fused switches were replaced with two panelboards, one for the main incoming breaker and main generator breaker (for emergency power), the other for distribution. Two solid-state circuit breakers with electronic trip units in the main panel provide flexibility to reduce the NFPA Hazard/Risk Category to Level 0 on the distribution panel. The two panelboards are connected by cable, so they’re assigned separate NFPA Hazard/Risk Category arc flash ratings. As a result of the new design, the entire plant, except for the main panelboard, is rated at Hazard/ Risk Category 0, meaning workers need wear only one layer of untreated natural fiber clothing. The main panelboard continues to be rated above a Hazard/Risk Category 4 because of the available fault current and faultclearing characteristics of the utility overcurrent protective devices. A power meter installed in the main panel allows Shay to track incoming power quality. “It was a good investment,” Shay says. “We love the ability to trend our incoming power, and we now have protective equipment that provides the optimal level of safety.” S ecure m aSter Where would you prefer to identify threats? At your building? Or at the perimeter of your facility? Secure Detect Secure BArrier Secure View Secure Light Secure Access SecureMaster is the comprehensive and cost-effective answer. Products within the Securemaster™ solution include, but are not limited to, high security fencing and gates, electronic surveillance, command software, vehicle barriers, vehicular and pedestrian access control, intrusion detection, and electronic sensing devices. Since 1961—Quality you can count on. Arc flash rating depends on the faultclearing characteristics of the upstream protective device. The two solid-state circuit breakers on this main panelboard reduce the NFPA Hazard/Risk Category to Level 0 in the rest of the plant. 8431 Hoyle Ave., Dallas, TX 75227 | 1-877-337-4358 securitysolutions@masterhalcosecurity.com | www.masterhalcosecurity.com | www.fenceonline.com September 2007 www.PLANTSERVICES.com 25 http://www.masterhalcosecurity.com http://www.masterhalcosecurity.com http://www.fenceonline.com http://www.PLANTSERVICES.com
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