Consulting-Specifying Engineer - October 2008 - (Page 18)

The Benefits of Selective Coordination he Cooper Bussmann Quik-Spec family of T products cost effective to selectivelythat make provides fusible solutions it simple and coordinate ® ™ a fused electrical distribution system. They also help designers, installers and building owners achieve greater downtime reduction, Code compliance and workplace safety by providing high interrupting ratings, high short-circuit current ratings, component protection and low arc-flash hazards. Selective coordination is mandatory per the NEC® for the circuit paths of some vital loads on specific systems including: Elevator Circuits: 620.62 Emergency Systems: 700.27 • Legally Required Standby Systems: 701.18 • Critical Operations Power Systems: 708.54 • Essential Electrical Systems: 517.26 • • Low-Peak fuses also offer the benefit of interrupting ratings up to a 300kA. Very few electrical systems will have available fault currents greater than 300kA, and if the system changes and the available short-circuit current increases (less than 200kA), the Low-Peak fusible solution still provides selective coordination. Selective Coordination* is Easy with Cooper Bussmann® Low-Peak® Fuses 2:1 Amp Ratio Just keep a 2:1 upstream to downstream amp rating ratio between any Low-Peak fuse and you have selective coordination of the fuses in a circuit Wide Class and Rating Selections Low-Peak fuses are available in CUBEFuse** (1-100A), LP-CC (Class CC, 1-30A), LPJ_SP (Class J, 1-600A), KRP-C_SP (Class L, 6016000A) and LPN-RK_SP (250V Class RK1, 1 /10-600A) & LPS-RK_SP (Class RK1, 1/10-600A) with ratings up to 600Vac and interrupting ratings of 300kA (200kA for Class CC) *For other fuse types, see published ratios in the Cooper Bussmann publication “Selecting Protective Devices” (SPD). **Class J performance. An electrical system circuit that has selectively coordinated overcurrent protective devices allows only the nearest upstream overcurrent protective device to open under any overcurrent condition. This increases the system’s reliability by preventing an overcurrent event from cascading and unnecessarily opening multiple levels of upstream overcurrent protective devices with the potential to unnecessarily blackout an entire building. For other electrical systems, selective coordination is also a highly desirable design consideration as selectively coordinated overcurrent protective devices help avoid unnecessary blackouts that negatively affect business assets and productivity. Cooper Bussmann Low-Peak® fuses make achieving a selectively coordinated system easy. For available short-circuit currents up to 200kA, just maintain at least a minimum 2:1 amp rating ratio between upstream and downstream fuses. (see right) For almost all systems, the engineer and installer can save money and time since there is no need to do a short-circuit current study or plot time-current curves to engineer selective coordination. The Cooper Bussmann® Quik Spec™ Coordination Panelboard integrates into your electrical system design to complement our other Quik-Spec solutions: the QuikSpec Power Module elevator disconnect and the Quik-Spec Safety Switch, to give you a complete fused system.

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - October 2008

Consulting-Specifying Engineer - October 2008 Contents Viewpoint Letters News M/E Roundtable Cities Under One Roof Eight Design Tips for Integration Is 'Green' Really New? Down the Drain Product of the Year Awards Codes & Standards Case Study New Products Equipment Lifecycles Advertiser Index Green Space

Consulting-Specifying Engineer - October 2008

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