Pressurised motor control centre (MCC) / power control centre (PCC) shelter located in hazardous zones
A motor control centre (MCC) / power control centre (PCC) is an assembly to control some or all electric motors in a central location. It consists of multiple enclosed sections having a common power bus and with each section containing a combination starter, which in turn consists of motor starter, fuses or circuit breaker, and power disconnect. A motor control centre can also include push buttons, indicator lights, variable-frequency drives, programmable logic controllers, and metering equipment. It may be combined with the electrical service entrance for the building.
MCC's are typically found in large commercial or industrial buildings where there are many electric motors that need to be controlled from a central location, such as a mechanical room or electrical room, called as MCC shelter.
When the above MCC / PCC is used in, around, or near an atmosphere that has flammable gases or vapors, flammable liquids, combustible dusts, ignitable fibers or flyings, there is always a possibility or risk that a fire or explosion might occur. Those areas where the possibility or risk of fire or explosion might occur due to an explosive atmosphere and/or mixture is often called a hazardous (or classified) location/area. The MCC shelter should be positively pressurised by fresh air blowed from safe zone through blower fan. The whole pressurised MCC shelter is composed with sensors, fire & gas system, intelligent PLC, fire dampers, air-conditioner, etc. The MCC shelter is manufactured according to offshore DNV2.7-1/EN12079 standards, certified by CCS, BV, etc class societies.