Definitions Applicable to 29 CFR 1910.269 cont'd

DOE-HDBK-1092-2004

NOTE: For air contaminants for which OSHA has not determined a dose or permissible

exposure limit, other sources of information, such as Material Safety Data Sheets that

comply with the Hazard Communication Standard, 1910.1200 of this Part, published

information, and internal documents can provide guidance in establishing acceptable

atmospheric conditions.

High-power tests--Tests in which fault currents, load currents, magnetizing currents, and line-

dropping currents are used to test equipment, either at the equipment's rated voltage or at

lower voltages.

High-voltage tests--Tests in which voltages of approximately 1000 volts are used as a

practical minimum and in which the voltage source has sufficient energy to cause injury.

High wind--A wind of such velocity that the following hazards would be present:

An employee would be exposed to being blown from elevated locations, or

An employee or material handling equipment could lose control of material being handled,

An employee would be exposed to other hazards not controlled by the standard involved.

Note: Winds exceeding 40 miles per hour (64.4 kilometers per hour), or 30 miles per hour

(48.3 kilometers per hour) if material handling is involved, are normally considered as

meeting this criteria unless precautions are taken to protect employees from the hazardous

effects of the wind. Immediately dangerous to life or health (IDLH) means any condition that

poses an immediate or delayed threat to life or that would cause irreversible adverse health

effects or that would interfere with an individual's ability to escape unaided from a permit

space.

NOTE: Some materials--hydrogen fluoride gas and cadmium vapor, for example--may

produce immediate transient effects that, even if severe, may pass without medical

attention, but are followed by sudden, possibly fatal collapse 12-72 hours after exposure.

The victim "feels normal" from recovery from transient effects until collapse. Such materials

in hazardous quantities are considered to be "immediately" dangerous to life or health.

Insulated--Separated from other conducting surfaces by a dielectric (including air space)

offering a high resistance to the passage of current. Note: When any object is said to be

insulated, it is understood to be insulated for the conditions to which it is normally subjected.

Otherwise, it is, within the purpose of this section, uninsulated.

Insulation (cable)--That which is relied upon to insulate the conductor from other conductors or

conducting parts or from ground.

Line-clearance tree trimmer--An employee who, through related training or on-the-job

experience or both, is familiar with the special techniques and hazards involved in line-

clearance tree trimming.

NOTE 1: An employee who is regularly assigned to a line-clearance tree-trimming crew and

who is undergoing on-the-job training and who, in the course of such training, has

demonstrated an ability to perform duties safely at his or her level of training and who is

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