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CBEMA and IEEE The U.S. Department of Commerce, working with the Computer

Business Equipment Manufacturers Association (CBEMA),

published a set of guidelines for powering and protecting

sensitive equipment. These guidelines were published in 1983

in FIPS Publication 94. As the use of computers has grown,

other organizations have made additional recommendations.

The Institute of Electrical and Electronic Engineers (IEEE)

published IEEE 446-1987 which recommends engineering

guidelines for the selection and application of emergency and

standby power systems. While it is beyond the scope of this

book to discuss in detail the recommendations of these

documents it is useful to discuss their intent.

CBEMA Curve The CBEMA curve is a useful tool that can be used as a

guideline in designing power supplies for use with sensitive

electronic equipment. The vertical axis of the graph is the

percent of rated voltage applied to a circuit. The horizontal axis

is the time the voltage is applied. The CBEMA curve illustrates

an acceptable voltage tolerance envelope. In general, the

greater the voltage spike or transient, the shorter the duration it

can occur. Voltage breakdown and energy flow problems can

occur when the voltage is outside the envelope.

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Siemens DTU3005-B Especificaciones Pagina 19