Arc-resistant motor control centers (MCCs) help protect employees from dangerous arc flashes while reducing the risks of the high costs related to these incidents. Before you invest, make sure you take the following equipment and installation aspects into consideration. They definitely can impact your safety, your maintenance and your costs.
Arc-resistant equipment can be a vital part of your safety program.Making the right choice requires knowing what to look for.
Rockwell Automation offers Allen-Bradley® CENTERLINE® ArcShieldTM medium and low-voltage arc-resistant motor controllers for rugged process control that are compliant to the IEEE C37.20.7 standard, Type 2 protection. The medium-voltage equipment maintains this level of protection, even when the low-voltage door is open during simple maintenance procedures. During an arc flash, the ArcShield controller redirects arc flash energy out the top of the unit and away from personnel.ArcShield is part of Rockwell Automation’s Intelligent Motor Control solutions that provide solutions like remote monitoring and real-time troubleshooting without the need to open unit doors, using IntelliCENTER software.
Installed on an electrical panel, the Chek- Volt™ interface, from Grace Engineered Products, allows maintenance personnel to use a non-contact voltage detector “pen” to check line voltage before and after they open the main disconnect. The ability to pre-verify electrical isolation before opening a panel puts an additional safety measure between electricians and hazardous voltage. The ChekVolt simply extends the line voltage from the main disconnect (or other voltage source) through a wire into an encapsulated non-metallic assembly fastened to the enclosure exterior. The single point ChekVolt R-1A has 6’ leads, mounts into a 0.50” (13mm) drilled hole, and can be ordered with a full line of bright yellow nameplates. Non-contact voltage detectors typically operate from 50/90-1000VAC, which allow users to apply ChekVolt to single or 3-phase AC power systems. Optional bright yellow nameplates remind personnel to pre-verify every voltage point before accessing the panel interior. Nameplates offered include various power system graphics or generic single-phase/3-phase nameplates. ChekVolt is a UL listed 600V device and rated for use in NEMA 4/4X/12 environment.
Grace Engineered Products, Inc.
Ferraz Shawmut’s new line of Enclosed Disconnect Switches is designed to meet plant maintenance operators’ requirements for compact and durable individual disconnecting means.Available in fusible and nonfusible versions, they provide safety, high performance for many environments, operational convenience and easy installation. According to their manufacturer, the Enclosed Non-Fused Disconnect Switches are often employed as motor disconnect switches to comply with NEC Article 430 for ‘line of sight’ applications. Other applications include using the Fusible Enclosed Disconnects for panels with no incoming disconnection provision, and employing them to help mitigate the risk of arc flash hazards.
A complete collection of advanced electrical training publications and e-training modules are now available from authorized Cooper Bussmann distributors, or online, to help reduce downtime, improve workplace safety and address code compliance issues. Developed for contractors, industrials, OEMs, inspectors and educators, the materials provide a training resource to help electrical industry workers comply with the latest NEC® and industry standards; select and apply overcurrent protective devices; determine fault current levels; and analyze and improve electrical system performance and stability.
Cooper Bussmann also offers an Express Member Service that provides a range of additional services: unlimited access to all technical training downloads; a free copy of the company’s innovative Selecting Protective Devices; a free Specification Grade Protection DVD; and exclusive memberonly offers and discounts.
St. Louis, MO
Advantica has added a valuable arc flash calculation tool to its SynerGEE® Electric software to help engineers develop strategies to minimize burn injuries resulting from arc flash incidents. Housed in SynerGEE’s robust Protection Coordination module, the new arc flashover analysis is based upon the IEEE 1584-2002 standard and fully integrated into the core electric software like other SynerGEE analyses.Advantica’s arc flash analysis determines the amount of potential current flow through a point in a distribution or transmission system and the time required for the nearest upstream protective device to function in the event of a fault.
ZMeters’ ZM100 Distribution Analysis System utilizes time-synchronized, multipoint measurement and correlation techniques to characterize the impedance of distribution systems in industrial, commercial or medical facilities. According to the manufacturer, since its introduction last year, the product’s unique, two-meter impedance measuring system also has been found to be well suited to making empirical measurements of the impedances required to perform arc flash potential calculations. The ZM100 system consists of two or more ZM100 Distribution Analyzers, each connected to a salient point in the facility’s electrical distribution system. Each of these devices is equipped to make time-synchronized and highly accurate measurements of voltages and currents for all phases and neutral.Measurements are made and data are gathered over a time period that characterizes the range of operating conditions that typically exist in the facility. The data is then communicated to a PC using Bluetooth wireless communications. The ZM100 Windows-based software performs a range of calculations and cor r e l a t i o n s resulting in a characterization of the distribution system’s i m p e d a n c e (both at line frequency and harmonics). Using the resultant characterization, distribution impedance abnormalities can be readily identified and necessary corrective measures can be prescribed.
Z Meters, Inc.
ProSoft Technology’s inRAx Wireless Ethernet/IP Communication Module (MVI56-WA-EIP) acts as a wireless bridge, enabling remote connectivity between a ControlLogix processor and 802.11 wireless devices including: PCs, Laptops, radio modems such as the RadioLinx Industria HotspotTM and other MVI56-WA-EIP modules. Keeping users safe from arc flash incidents is just one of this product’s many benefits.With approximately 10 arc flash explosions in the U.S. each day and nearly five severe burn victims associated with each explosion, the costs saved by avoiding these incidents can be substantial. The MVI56-WA-EIP allows access to needed data without staff having to enter into mandated flash boundary zones and without them having to touch processors.