Equipment that moves in any way (even rotation) must be isolated by:
 disconnecting the equipment from its power source and de-energizing
the equipment, and
 lockout and tagging. Only workers trained in lockout and tagging should perform such operations. Lockout and tagging should be done even if you use the first option {disconnect and deenergize) to isolate the
energy.

For pneumatic or hydraulic equipment, isolate the power source and
depressurize the supply lines. Depressurize any components that may still be pressurized after the supply lines have been bled-hydraulic cylinders for example, you must disconnect and drain the pipe carrying solids and liquids to or from a confined space or insert blank flanges.

If the pipe cannot be blanked off or disconnected, the valve may be
closed, chained, locked and tagged, provided that this type of control and its importance have been explained to all workers in the area. Simply closing valves is not generally acceptable. You may need blocking to prevent movement caused by gravity for some equipment (e.g., conveyors).
Electrical equipment in the space should be disconnected, tagged and locked out, and grounded when it’s practical to do so. In the case of live electrical work in a confined space, you need to pay special attention to standard procedures.
A minor mistake in a manhole can lead to disaster. Cramped working conditions can make accidental contact with an energized conductor more likely, so you may need non-conductive equipment. You may need gloves, mats, and other insulating equipment depending upon the type of work. Capacitors or other components which can store a charge should be discharged and/or grounded.