Electrical equipment safety operation procedures - Solutions - Huaqiang Electronic Network

Shunuo Varistor / ESD Varistor / Complete Product Line / Sunlord's First-Class Agent

SMD Aluminum Electrolytic Capacitor

Probe Current Voltage Pin – 420 x 4450, Head Diameter 5.0, Overcurrent and Voltage Pin

Brand AVX TPSE226M035R0125 – Low Impedance Tantalum Capacitor, AVX 22 Series

Photocoupler

1. Scope of Application

This document outlines the necessary guidelines for the safe operation of electrical equipment within the company. It applies to all personnel involved in the installation, maintenance, and use of electrical systems.

2. Main Content

2.1 All electrical equipment must be repaired or maintained by a qualified electrician or under their direct supervision. Unauthorized modifications are strictly prohibited.

2.2 Any electrical device should be assumed to be energized unless confirmed otherwise. Always follow proper lockout/tagout procedures before working on any system.

2.3 The power supply section of all electrical equipment must be equipped with a dedicated circuit breaker. Each circuit should have its own switch, and it is not allowed to share one switch among multiple devices. The switch box must be locked in a secure location, with keys kept by a designated person. The bottom of the switch box should be at least 1.3 meters above the ground, and a residual current device (RCD) must be installed in the distribution panel.

2.4 The power supply voltage must match the rated voltage of the equipment. For three-phase systems, voltage fluctuations should not exceed ±5%. The transformer capacity must be sufficient to support the mechanical load, and motor starting devices must be properly installed as required.

2.5 Fuses must be selected according to the rated current of the circuit. Never replace fuses with copper wire or other conductive materials. Ensure that the fuse rating does not exceed the line’s capacity.

2.6 If two consecutive circuit trips occur or a fuse blows, the cause must be investigated immediately. Do not attempt to reset the circuit without identifying and resolving the fault.

2.7 Regular insulation checks are essential. Insulation resistance should be at least 1000 ohms per volt (e.g., 220 V to ground should have no less than 0.22 MΩ). If any insulation issues are found, they should be repaired immediately.

2.8 Electrical equipment must be properly grounded or connected to neutral. Grounding resistance must meet safety standards. Each unit should be grounded separately, and grounding wires should never be used for short-circuiting. Avoid using lightning arresters as grounding wires, and do not mix grounding and neutral connections in the same system.

2.9 Equipment located higher than surrounding structures must be protected against lightning strikes and equipped with reliable grounding systems. The grounding resistance must comply with local regulations.

2.10 All wiring must follow established electrical codes and local utility requirements. Proper installation techniques should always be followed to ensure safety and compliance.

2.11 Insulated wires must be intact and free from damage. Live parts should never be exposed. Avoid pulling cables across the floor or scaffolding. Ensure that all wire connections to equipment are tight and regularly inspected. If looseness is detected, repair it immediately. Cables running along walls must be protected with conduits, and no objects should be hung on them.

2.12 Mobile electrical equipment should use flexible rubber cables and be arranged in a way that allows for easy movement while remaining secure. When passing through walkways or scaffolding, cables must be protected with rigid covers. When trenching, cables should be enclosed in steel pipes or plates for protection.

2.13 In low-voltage circuits below 500V, never operate switches with bare hands while under load. If necessary, use an arc suppression cover or wear insulated gloves and safety goggles. Never face the blade directly during operation.

2.14 After starting electrical equipment, check all instruments. Only proceed with work once the current meter stabilizes and shows normal readings.

2.15 Electrical equipment should be stored in dry, well-ventilated areas. All on-site equipment must have adequate rain and moisture protection. Avoid spraying water directly onto electrical components when cleaning machinery.

2.16 In case of a power outage during operations, immediately turn off the main switch and hang a "Do Not Close" warning sign. When performing repairs or maintenance, disconnect the power, remove the fuse, lock the switch box, and hang a "Maintenance in Progress" sign. Never restore power without confirming with the maintenance team. Unless working on high-voltage live systems, never operate electrical equipment while it is energized.

2.17 After completing the task, always turn off the power and lock the switch box before leaving the site.

2.18 Handheld lighting tools should use a safe voltage of 36 volts or lower. In damp environments like pipes, wells, boilers, or metal containers, use 12 volts. The transformer must be double-wound, with the casing and secondary winding grounded.

2.19 In the event of an electrical leak or fire, first cut off the power. Use carbon tetrachloride or dry powder extinguishers—never water or other inappropriate fire-fighting agents.

2.20 In the case of an electric shock, immediately cut off the power source and perform artificial respiration. Do not touch the victim until the power is disconnected to prevent further shocks.