Definitions cont'd - hdbk10920281

DOE-HDBK-1092-98

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

3. 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 under the direct

supervision of a line-clearance tree trimmer is considered to be a line-clearance tree trimmer for

the performance of those duties.

NOTE 2: A line-clearance tree trimmer is not considered to be a "qualified employee" under this

section unless he or she has the training required for a qualified employee under paragraph

(a)(2)(ii) of this section. However, under the electrical safety-related work practices standard in

Subpart S of this Part, a line-clearance tree trimmer is considered to be a "qualified employee".

Tree trimming performed by such "qualified employees" is not subject to the electrical safety-

related work practice requirements contained in 1910.331 through 1910.335 of this Part. (See

also the note following 1910.332(b)(3) of this Part for information regarding the training an

employee must have to be considered a qualified employee under 1910.331 through 1910.335

of this part.)

Line-clearance tree trimming--The pruning, trimming, repairing, maintaining, removing, or clearing

of trees or the cutting of brush that is within 10 feet (305 cm) of electric supply lines and equipment.

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