Series Street-Lighting Circuits and Apparatus

DOE-HDBK-1092-2004

2. Climber gaffs and straps shall be designed for tree climbing. The safety strap shall be

constructed to withstand contact with saws and other sharp objects. Workers in trees shall

be tied off.

7.9

SERIES STREET-LIGHTING CIRCUITS AND APPARATUS

Lighting circuits and apparatus used for series street-lighting should comply with the following:

1. Rubber gloves or any other necessary protective equipment should be used when working

on a series street-lighting circuit, unless the circuit is electrically isolated and grounded at

the work location. Unless properly tagged and isolated, series street lighting circuits should

be considered as being energized.

2. The opening of a time clock, a photoelectric relay, or remote control overcurrent control

equipment shall not be considered as isolation points that provide a safe work condition

while employees work on series lighting circuits.

3. The use of series lighting circuits is discouraged.

7.10 UNDERGROUND

Underground work requires a means of safe entrance and exit from the workspace. Employees

should follow the guidance given in the following subsections to ensure safety in entering and

leaving such work spaces.

7.10.1 WORKING IN MANHOLES, UTILITY TUNNELS, AND VAULTS

Manholes, utility tunnels, and vaults may be considered confined spaces and shall comply with

29 CFR 1910.146,1910.269(e) and (t), and 1926.956. The following may apply to employees

working in manholes, utility tunnels, and vaults:

1. Employees who enter manholes shall be trained in the hazards of the confined spaces,

confined space entry procedures, and confined space emergency and rescue procedures.

2. When opening a manhole, employees shall completely remove the manhole cover from the

opening. Manhole covers should be removed before the cable is rodded or installed and

removed.

3. Open manholes shall be barricaded and protected by flags or guards as required. All open

manholes shall be protected as required by 29 CFR 1910.269(e).

4. Before the pit is entered, it shall be tested for oxygen content and the flammable-gas

explosive limit. Workers shall not smoke or use an open flame while tests for an explosive

mixture of gas are being made.

5. If the oxygen level is less than 19.5 percent or greater than 21 percent, the pit shall be

ventilated and retested before any work begins.

6. If the flammable-gas content is more than 10% of the lower explosive limit, the pit shall be

ventilated and retested before any work begins. When testing indicates that a manhole

contains either a mixture of explosive gas and air richer than safe working limits or

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