Safety 1st Advancer Manual do Operador descarregar pdf (Página 45)

Environmental Remediation Drilling

Safety Guidelines

Page 45 of 132

effects of wind on the power lines and hoist lines of the mast, it is advisable to maintain a 20-foot

clearance.

• Post signs on ground level to alert workers to the presence of overhead utilities.

• Never raise the mast of the rig without a designated spotter.

• Except where electrical distribution and transmission lines have been de-energized and visibly

grounded at point of work or where insulating barriers, not a part of or an attachment to the

equipment or machinery, have been erected to prevent physical contact with the lines, equipment or

machines shall be operated proximate to power lines only in accordance with the following per 29

CFR 1926.550(ii):

o For lines rated 50 kV or below, minimum clearance between the lines and any part of the

crane or load shall be 10 feet,

o For lines rated over 50 kV, minimum clearance between the lines and any part of the crane or

load shall be 10 feet plus 0.4 inch for each 1 kV over 50 kV, or twice the length of the line

insulator, but never less than 10 feet,

o In transit with no load and boom lowered, the equipment clearance shall be a minimum of 4

feet for voltages less than 50 kV, and 10 feet for voltages over 50 kV, up to and including

345 kV, and 16 feet for voltages up to and including 750 kV.

• Unless a more conservative spacing requirement is stipulated by state or local regulations, use the

following table as minimum spacing guidance:

TABLE 4.1 - Spacing Guidelines for Electrical Service

Nominal Voltage

(Phase to Phase)

Minimum Required

Clearance (feet)

≤ 50,000 10

Over 50,000 to 75,000 11

Over 75,000 to 125,000 13

over 125,000 to 175,000 15

over 175,000 to 250,000 17

over 250,000 to 370,000 21

over 370,000 to 550,000 27

over 550,000 to 1,000,000 42

Adapted from Code of Safe Drilling Practices, California Dept. of Transportation,

Division of Engineering Services, Revised April 30, 2004

• Because of the difficulty in estimating distances from the ground and the effects of wind on the

power lines and hoist lines of the mast, it is advisable to maintain at least a 20-foot clearance.

• Confirm with the power company that overhead power lines have been de-energized prior to drilling.

• Never drive the drill rig from hole to hole with the mast in the raised or partially raised position.

If contact between rig and power line occurs:

Assume the entire rig to be electrified. Do not attempt to enter or leave the rig or touch any part of it.

Although people in the rig may not be affected, anybody touching the rig while in contact with the

ground is in danger of being electrocuted.

Have someone call the power company and the local fire rescue squad immediately for assistance.

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