IEEE 463-2019 pdf free.IEEE Standard for Electrical Safety Practices in Electrolytic Cell Line Working Zones.
The cell line working zone shall not be required to extend through or beyond walls, floors, roofs, ceilings, partitions, barriers, or the like.
Note that each cell may have attachments and auxiliary equipment, which are electrical extensions of the cells that can be hazardous. Examples of these extensions include piping and the associated fluids within, cell frames, instrumentation, and electrical disconnect switch. Each of these extensions should be identified and recognized at each plant so the electrical hazard is clearly understood.
5. Improved safeguarding of personnel from electrical hazards within the cell line working zone
Operation and maintenance of electrolytic cell lines routindy rcquircs personnel to contact exposed electrically energized surfaces such as electrolytic cells, their energized attachments and dc bus. The potential risk of injury due to electrical hazards presented by these energized surfaces can be reduced or minimized by the selection and use of appropriate safeguards.
Exposed energized surfaces of cells and attachments in themselves do not necessarily create electrical hazards. However, simultaneous contact between surfaces operating at different potentials, including ground potential, could create an electrical hazard. Therefore, safeguards shall be provided for personnel performing work tasks within the cell line working zone.
Safeguards shall be provided by one or a combination of the means described in 5.1 through 5.10. In some cell line installations, certain safeguards are inherent due to building size, equipment spacing, component type, materials of construction, etc.
5.1 Insulation
Insulation includes a properly designed system forenergized anctiorgrounded surfaces utilizing nonconductive materials. Nonconductive material may include glass, porcelain, epoxy coating. rubber, fiberglass. plastic. and when dry, such materials as concrete, tile, brick, and wood.
Periodic testing and monitoring of the insulation integrity used in the cell line work zone from the cell line energized surfaces and ground is required. The electrical insulation systems on fixed and movable equipment within the cell line working zone shall be tested periodically and monitored to help ensure the insulating propcrtics do not degrade to a state that the equipment ba.omes unsafe to use.
Personnel working on or around an electrolytic cell line may mistake cell line potential and insulated members from grounded members. Additional safeguards (listed in Clause 5) may be warranted based on a task based risk assessment of the task being performed.
5.2 Guards
Guards include mechanical devices such as covers, casings. barriers, rails, screens, mats, and platforms that prevent approach or contact with electrically energized or grounded surfaces.
5.3 Voltage equalization
Voltage equalization is accomplished by connecting a conductive surface to an electrically energized surface. either directly or through a resistance, so that there is insufficient voltage difference, helping to reduce the risk of an electrical hazard.
5.4 Isolation
Isolation employs the placement of equipment or items in locations so that personnel are unlikely to simultaneously contact exposed conductive surfaces at different potentials.
5.5 Physical clearance
Physical clearance is a substantially safe working distance designed to minimize safety risks that may be less than that defined for the cell line working zone.IEEE 463 pdf download.