IEEE Std 463 pdf free download

IEEE Std 463 pdf free download.Electrical Safety Practices in Electrolytic Cell Line Working Zones.
cell voltage: The dc voltage between the positive and negative terminals of one electrolytic cell.
electrical haiard: A condition where contact or equipment failure can result in electrical shock, arc flash burn. thermal burn, or blast.
electrolv tic cell: A receptacle or vessel in which electrochemical reactions are caused by applying electrical energy for the purpose of refining or producing materials.
ground: A conducting connection, whether intentional or accidental, between an electric circuit or equipment and the earth, or to some conducting body that serves in place of earth.
guarded: Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casing, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger.
insulated: Separated from other conducting surfaces by a dielectric, offering a high resistance to the passage of current. Air space is also a dielectric.
NOTE——When any object is said to be insulated, it is understood to be insulated for the conditions to which it is normally subjected. Otherwise, it is considered uninsulated, within the purpose of this definition.
isolated: Not readily accessible to persons unless special means for access is used.
isolation transformer: A transformer used to electrically separate one circuit from another.
safeguard: A precautionary measure or requirement, or a technical plan to prevent accidents.
work practices for improved safety: Operating and maintenance procedures effective in minimizing the risk of incidents.
3. Description of electrolytic cell lines
Electrolytic cell lines differ widely in size and in physical and electrical characteristics, even for the same type process. One cell line may operate at less than 25 V dc and another at more than 2000 V dc depending on the type and number of cells. Also, one cell line may operate at a few thousand amperes dc and another at over 600 000Adc.
Electrolytic cell lines may be located indoors or outdoors. may be in a wet or dry environment. may have conductive or nonconductive floor surfaces, and may be electrically connected to auxiliary equipment such as pumps, motors, piping, and steelwork at elevations above and/or below the cells.
Electrolytic cell line installations and their associated power sources, electrical conductors, auxiliary equipment, and attachments are custom-designed for each installation.
Note that the electrical shock hazard can exist for an extended time period after the cell line rectifiers are dc-energized. Each electrolytic cell functions similarly to an electrical storage battery, which is typically referred to as the battery effect.” Due to this battery effect an electrical hazard will exist after the rectifier dc power supply is disconnected. The battery effect will keep the cell line energized with a potential until the chemical reaction in the cell has depleted.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.IEEE Std 463 pdf download.