Inspection and Maintenance

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, or Arc Flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462. This equipment must be installed and serviced only by qualified electrical personnel. Perform such work only after reading and understanding all of the instructions contained in this bulletin. Turn off all power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources of electric power. Assume all circuits are live until they are completely de-energized, tested, and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of backfeeding. Always practice lock-out/tag-out procedures according to OSHA requirements. Open all circuit breaker and switch contacts and discharge all springs before performing maintenance work, disconnection, or removal of a circuit breaker. Move circuit breakers to the disconnected position before removing rear access panels. Conduct electrical testing to confirm no short circuits were created during installation, maintenance, or inspection. Never insert a circuit breaker into a circuit breaker compartment that is not complete and functional. Disconnect all high voltage to the switchgear before accessing the horizontal bus compartment. Do not use liquid fire extinguishers or water on electrical fires. Before extinguishing fires within the assembly, ensure all sources of electric power are disconnected and the main and all feeder circuit breakers are open. Carefully inspect your work area, and remove any tools and objects left inside the equipment. Replace all devices, doors, and covers before turning on power to this equipment. All instructions in this manual are written with the assumption that the customer has taken these measures before performing maintenance or testing. Failure to follow these instructions will result in death or serious injury.

Set environmental controls (thermostat, humidistat, other items.) to mitigate condensation (including times when the equipment is lightly loaded, such as storage, downstream loads deenergized). Consult the engineer of record for the appropriate environmental control settings.

Perform inspection and maintenance for the non-walk-in enclosure on the basis of environmental conditions and experience. Abnormal operation or conditions may require immediate corrective action. The inspection for the switchgear is outlined in detail in instruction bulletin 6055-40. The following instructions apply only to the non-walk-in enclosure.

The inspection of the Masterclad Metal-Clad 27 kV Indoor Switchgear is outlined in detail in Instruction Bulletin 6055–40.

Replace the filters every six months or as applicable. List of Supported Regional Building Codes and Seismic Design Standards lists correct filter applications.

Periodic switchgear maintenance also includes cleaning, lubricating, and exercising component parts. The maximum recommended inspection interval is one year. During regular inspection intervals, check for the following:

• Check for leaks in the front of the switchgear and in each circuit breaker and cable compartment.

• Check the drain holes in the cable compartment doors to help ensure they are not clogged.

• Check the thermostat settings. Verify that space heaters in the switchgear are operating.