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B or BAT.
or BATT. Battery.
Breaker Circuit breaker.
British Thermal
Unit A unit of heat equal to 252 calories (see BTU).
BTU or Btu British thermal unit. Defined as the amount of energy required to raise the
temperature of 1 pound of water by 1° F.
BYP Bypass.
BYPASS Maintenance bypass; wrap-around manual maintenance bypass using the
optional bypass circuit breaker Q3BP in conjunction with circuit breaker
Q4S and isolation circuit breaker Q5N.
Bypass
AC input Mains 2.
Calorie A unit of heat. One calorie is the amount of energy required to raise the
temperature of one gram of water by one degree Celsius.
Carrier The company or individual responsible for delivering goods from one area
to another.
CB Circuit breaker.
Conduit A flexible or rigid tube surrounding electrical conductors.
C.S.S. Customer Support Services.
CT Current transformer.
Curr. Current.
Current rating The maximum current that a piece of electrical equipment is designed to
carry.
DC or dc Direct current.
Earth ground A ground circuit that has contact with the earth.
Electrician Refers to an installation electrician qualified to install heavy-duty electrical
components in accordance with local codes and regulations. Not
necessarily qualified to maintain or repair electrical or electronic equipment.
Compare to technician.
EPO Emergency power off.
g — 2 Glossary
EPS 6000 UPS Shared Systems