6 December 2006
Including change 1, 7 December 2006
Protect all exposed cables against damage in a work area with boards or
other nonconductive materials. Utilize suitable nonflammable protective material when
it is necessary to weld adjacent to cables.
Do not stand, sit, kneel, or lean on unprotected direct-burial cables.
DAMAGE TO EXISTING UTILITY LINES. If any existing utility lines are
damaged then certain steps must be taken dependent upon the type of line.
If electric cables are damaged the cables must be deenergized and repaired.
If high-energy lines such as natural gas, steam, or hot water are damaged,
notify the local fire department, utility office, and security or police department
immediately. Shut off all sources of the utility, if possible leave the hole open until all
utility line flow has been dissipated safely. Warn and evacuate any workers or residents
in the area as necessary, and keep the public well clear of the area.
Environmentally sensitive lines, such as sewer, fuel, and oil, must be handled
in accordance with applicable health and safety requirements. Notify the local fire
department, utility office, environmental office, and security or police department
immediately. Take measures to prevent flow into storm drains or nearby waterways.
Cleanup must be initiated as soon as possible.
Other lines, such as communication, water, and storm drainage, must be
handled by notification as soon as possible to the appropriate utility office or
maintenance department. Notify the local fire department in case of damage to
waterlines since this may impact fire protection systems in the area.
PREPARING TO WORK UNDERGROUND.
General Atmosphere Control Precautions Before Entry.
11-6.1.1 Work in underground structures must conform to confined space entry permit
requirements. Table 11-1 summarizes the major steps in determining that structures
can be safely entered.