MELTRIC Switch-Rated Plugs & Receptacles
Generator Plugs & Receptacles
Danger – Live Generator Connections
Workers risk exposure to arc flash when disconnecting standard generator plugs and receptacles. To prevent accidents install UL/CSA switch-rated generator plugs and receptacles from MELTRIC. They are a combination plug, receptacle and disconnect switch in one device. MELTRIC’s receptacles/connectors feature a built-in switching function that ensures the contacts are safely deenergized before the generator plug can be withdrawn. Arc flash safety is ensured.
Switch-Rated Generator Plugs & Receptacles
√ Switch ratings ensure safe load breaking/making –
even in overload situations.
MELTRIC devices are switch-rated up to 200A and 60HP. They provide short circuit make & withstand protection up to 100kA.
√ Dead front design prevents exposure
to live parts and arc flash hazards.
The need for arc flash protection boundaries and cumbersome PPE is eliminated. Switch-Rated devices maintain a NFPA 70E 'hazard risk category' equal to zero.
√ Separation of the plug & receptacle provides
verification of deenergization.
Voltage testing is not required. Visible contact separation proves the power is off.
√ Plug & play simplicity allows any qualified worker to quickly connect and disconnect generators and other electrical equipment.
Specially trained electrical workers are not required for load making/breaking. Downtime related to equipment change-outs can be reduced by up to 50%.
√ Lockout provisions facilitate easy compliance with
Only your lock and tag are needed, no additional mechanisms are required. (Provisions are standard on the plug and optional on the receptacle.)
√ NEC, UL & CSA Compliance
In addition to their electrical plug & receptacle listings, MELTRIC Decontactor Series plugs & receptacles are UL/CSA listed for 'Branch Circuit Disconnect Switching' and 'Motor Circuit Disconnect Switching' per UL Subject 2682
'Switch-Rated Plugs & Receptacles.'
Safer and Faster Portable Generator to Lift Station Connections
A Wisconsin wastewater treatment plant is saving time with a combination plug/receptacle and disconnect switch that makes generator connections safe, fast and easy at lift stations around town. Safety concerns led the Watertown, WI wastewater utility to equip its portable emergency generators and remote lift stations with MELTRIC Switch-Rated plugs and receptacles that all workers to safely make and break electrical connections, even under full load.
Running beneath the city are 105 miles of sewers that collect wastewater from a 12 square mile area. The collection system also includes 18 remote lift stations. The lift stations, located around the city, use submersible pumps to elevate the wastewater in the sewer lines and facilitate gravity flow to the treatment plant. Typically, they are located below ground level with a control panel above ground. Assistant Water Systems Manager-Wastewater Kevin L. Freber says the total capacity of the pumps is 27 million gallons per day, although flow generally averages between three and three-and-a-half mgd.
While some lift stations are equipped with stationary generators to provide emergency power, a power failure may make it necessary to bring the department’s portable generators to the other lift stations to power the pumps until service is restored. Previously, these stations were equipped with conventional pin and sleeve connectors. However, these pin and sleeve devices had a limitation: they could not be locked-out easily in order to prevent tampering by vandals or injury to children who might try to remove them. Freber says, “The generators deliver 100 amp service, and with the plugs we had before, there was no way of locking the two parts together. Any kid could walk up and pull it apart.”
Freber points out that MELTRIC Switch-Rated devices are easy to lock-out and safe when they are separated because live parts are not exposed. He states, “You have to twist it to open it, and even if someone could get it apart, they never could get at the live contacts.” This is due to their dead-front design and enclosed arc chambers. Easily accessible live contacts on pin and sleeve connectors had the potential of exposing operators to live power. MELTRIC devices not only shield workers from live parts, they also help the utility in complying with NFPA 70E's arc flash requirements.
Arc flash can be a concern when it becomes necessary to switch power connections, but the city’s lift stations that use mobile generators for emergency power are constructed to minimize or eliminate this risk. Freber says that wiring typically comes up from the pump into the bottom section of the control panel, which is constructed so that the related starters and other electronics are segregated in a sealed area. He explains, “Because of the new arc flash laws, we have them separated so our technicians can open the outside panel without danger from arc flash. There is also a walking beam inside, so when we switch from city power to emergency power, the power can’t back feed. Using the MELTRIC device to connect to the generator with this arrangement we can switch safely from city to emergency power.” Now, it takes only minutes to connect a generator and begin pumping. The ability to connect or disconnect quickly and safely makes it easier to move generators around to various lift stations for monthly test runs or if necessary during a prolonged or widespread power outage.