A building management system (BMS), otherwise known as a building automation system (BAS), is a computer-based control system installed in buildings that controls and monitors the building's mechanical and electrical equipment such as ventilation, lighting, power systems, fire systems, and security systems.
A BMS consists of software and hardware; the software program, usually configured in a hierarchical manner, can be proprietary, using such protocols as C-Bus, Profibus, and so on. Vendors are also producing a BMS that integrates the use of Internet protocols and open standards such as DeviceNet, SOAP, XML, BACnet, LonWorks and Modbus.
Extra-low voltage (ELV) is an electricity supply voltage in a range which carries a low risk of dangerous electrical shock. There are various standards that define extra-low voltage. The International Electrotechnical Commission member organizations and the UK IET (BS 7671:2008) define an ELV device or circuit as one in which the electrical potential between conductor or electrical conductor and earth(ground) does not exceed 50 V a.c. or 120 V d.c. (ripple free). EU's Low Voltage Directive applies from 50 V a.c. or 75 V d.c.
|IEC voltage range||AC RMS voltage (V)||DC voltage (V)||Defining risk|
|High voltage||1000||1500||Electrical arcing|
|Low voltage||50 to 1000||120 to 1500||Electrical shock|
|Extra-low voltage||50||120||Low risk|
Mechanical, electrical and plumbing (MEP) refers to these aspects of building design and construction. In commercial buildings these aspects are often designed by an engineering firm specializing in MEP. MEP design is important for design decision-making, accurate documentation, performance and cost-estimation, construction planning, managing and operating the resulting facility. Building Categorized Revit software is used in MEP.
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