What is the maximum residual voltage that must be achieved for a capacitor rated 1,000 volts or less after it has been disconnected from the supply?

The maximum residual voltage that must be achieved for a capacitor rated 1,000 volts or less after disconnection from the supply is 50 volts. This requirement is critical for ensuring safety. Capacitors can retain a significant amount of electrical energy even after they have been disconnected from a power source.

To protect individuals working with or near these types of capacitors, regulatory standards mandate that the residual voltage be kept at a low level to minimize the risk of electric shock. The threshold of 50 volts is set as a safety measure, as voltages above this level can be hazardous. The specific stipulation of 50 volts ensures that any technician or worker who is servicing or conducting maintenance on equipment with such capacitors can do so with reduced risk.

Understanding this standard is crucial for anyone working with electrical systems, especially in fields involving limited energy sources, as it emphasizes the importance of safety procedures and voltage precautions after components are de-energized.