December, 2012
www.us-tech.com
Page 83 Bentek Solar Intros Safety Disconnects
San Jose, CA — Bentek Solar has introduced its MDSS, is a cost-effec- tive means for providing safety and code compliance for PV installations. The MDSS contains a bank of
load-break disconnects in a compact, free-standing cabinet.
code-compliant fuse isolation that inverters do not. This allows fuses in the inverter to be removed safely. Multiple sources of power are
much less common in AC applica- tions. As a result, PV installations contain hazards that many electri- cians and maintenance personnel are not accustomed to. Contact with a live fuse that has 600 or 1000V of electricity present can result in death. To help prevent this, National Electrical Code (NEC) 2011 690.16 states that, “an external disconnect must be installed within the line of sight of the inverter fuses or at a dis- tance not greater than 50 feet from the inverter fuses.” However, not all states follow
PV safety disconnects. Typically, the MDSS is
installed next to the inverter and provides the safety and arc flash reduction that is needed in all photo- voltaic (PV) systems, solving a criti- cal safety issue that is commonly overlooked. The MDSS provides
Epoxies Etc. Thermally Conductive Potting
this NEC rule. This should be of great concern not only for the installers but also for the operations and maintenance (O&M) organiza- tion that will need to maintain the PV system for years to come. Bentek Solar’s MDSS with
optional zone current monitoring is optimized to work with most invert- ers at both 600 and 1000VDC. The number of inputs and current capac- ity of the load-break disconnects in the MDSS are matched to the num- ber and capacity of the internal inverter fuses. This ensures that when the MDSS arrives at the proj- ect site, it is simple to install by elim- inating extra racking, conduit and expensive labor that is required with
traditional, individual knife-blade disconnects, saving up to 30 percent in total cost. The installer typically runs the
cables up through the bottom of the MDSS and connects one cable to each input and one cable to each output. Each output cable then runs to an inverter fuse. For example, if the inverter has eight internal fuses that are 400A each, the MDSS would con- tain eight 400A load-break discon- nects, with each disconnect connect-
ing to an inverter fuse. Contact: Bentek Corp., 2350
Harris Way, San Jose, CA 95131 % 866-505-0303 or 408-954-9600
E-mail:
JohnB@bentek.com Web:
www.BentekSolar.com
Silicone Cranston, RI — Epoxies, Etc. has introduced a new silicone potting and encapsulating compound with a con- venient 1:1 mix ratio. The 50-1952 is specially formulated for quick ther- mal transfer away from heat-gener- ating electronic devices. With its high operating temperature range from –65 to +235°C, the compound provides protection in extreme envi- ronmental applications.
Cured silicone has high tensile strength.
The 50-1952 is flexible and
therefore protects electronics from vibration and impact. Made without the use of harsh solvents or other toxic materials, this compound is safer to use than other common materials. The flexible material cushions
electronics; it is thermally conductive, vibration, and reversion resistant; low exotherm eliminates the need for mul- tiple pours; easy 1:1 mix ratio; sol-
vent-free; not hazardous to ship. Contact: Epoxies, Etc., 21
Starline Way, Cranston, RI 02921 % 800-376-9437 or 401-946-5564
E-mail:
service@epoxies.com Web:
www.epoxies.com
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