Definitions cont'd - hdbk10920294

DOE-HDBK-1092-98

Ventilated--Provided with a means to permit circulation of air sufficient to remove an excess of heat,

fumes, or vapors.

Volatile flammable liquid--A flammable liquid having a flash point below 38 degrees C (100

degrees F) or whose temperature is above its flash point, or a Class II combustible liquid having a

vapor pressure not exceeding 40 psia (276 kPa) at 38 deg. C (100 deg. F) whose temperature is above

its flash point.

Voltage--(Of a circuit.) The greatest root-mean-square (effective) difference of potential between

any two conductors of the circuit concerned.

Voltage, nominal--A nominal value assigned to a circuit or system for the purpose of conveniently

designating its voltage class (as 120/240, 480Y/277, 600, etc.). The actual voltage at which a circuit

operates can vary from the nominal within a range that permits satisfactory operation of equipment.

Voltage to ground--For grounded circuits, the voltage between the given conductor and that point

or conductor of the circuit that is grounded; for ungrounded circuits, the greatest voltage between the

given conductor and any other conductor of the circuit.

Watertight--So constructed that moisture will not enter the enclosure.

Weatherproof--So constructed or protected that exposure to the weather will not interfere with

successful operation. Rainproof, raintight, or watertight equipment can fulfill the requirements for

weatherproof where varying weather conditions other than wetness, such as snow, ice, dust, or

temperature extremes, are not a factor.

Wet location--See "Location."

DEFINITIONS APPLICABLE TO 29 CFR 1926 SUBPART V

Alive or live (energized)--The term means electrically connected to a source of potential difference,

or electrically charged so as to have a potential significantly different from that of the earth in the

vicinity. The term "live" is sometimes used in place of the term "current-carrying," where the intent

is clear, to avoid repetition of the longer term.

Automatic circuit recloser--The term means a self-controlled device for automatically interrupting

and reclosing an alternating current circuit with a predetermined sequence of opening and reclosing

followed by resetting, hold closed, or lockout operation.

Barrier--The term means a physical obstruction which is intended to prevent contact with energized

lines or equipment.

Barricade--The term means a physical obstruction such as tapes, screens, or cones intended to warn

and limit access to a hazardous area.

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