How to scientifically design electrical circuits and prevent fires
The three elements of fire, namely fire source, combustibles, and oxygen, are equally applicable to the analysis of electrical fire accidents and prevention. Arc is an important representative of fire source elements in electrical fires. When electrical circuit insulation is aging, damaged, connector virtual connection, line virtual connection, and short circuit, faulty arcs will occur, (arc discharge) even within the rated current range. An arc occurs, and heat is generated at the same time as the arc occurs, enough to ignite adjacent combustibles.
Arc can be divided into "good arc" and "bad arc". The so-called "good arc" is an arc that occurs under normal conditions of electrical equipment, such as between the brushes of a DC motor and the commutator, switches or contactors that turn on and off the load circuit. "Bad arc" is a faulty arc, which can be divided into three categories:
Class A-series arc, which occurs in the same phase;
Type B-parallel arc, which occurs between phases;
Class C-the arc to the ground occurs between the front and the neutral line to the ground, namely leakage.
IEC/EN 60204-1 Fire protection requirements in electrical safety
Low-voltage inverters talked about how to plan and install electrical circuits for industrial machinery in accordance with the specifications to prevent electrical fires? The electrical safety specification for industrial machinery IEC/EN 60204-1 gives an answer. The specification also starts with the three elements of fire, and makes provisions for the selection of components, equipment and installations of the electrical system of industrial machinery:
Prevent arc fire source:
Insulation damage causes "bad arcs". For this reason, IEC/EN 60204-1 requires the electrical equipment of equipment to prevent sharp objects from damaging the insulation.
Poor joints may lead to "bad arcs". For this reason, IEC/EN 60204-1 requires that the connection of wires can only be through the terminal block, not through crimping terminals or splicing.
Prevent combustibles
When the parts in the electrical cabinet are not selected properly, it will lead to the extension of the fire. In order to prevent the occurrence of this situation, IEC/EN 60204-1 requires all electrical components to conform to their corresponding IEC specifications to ensure that electrical components All are made of flame-retardant materials.
As experts in human, machine and environmental safety, we rely on years of accumulation in the field of mechanical safety, and first put forward the concept of "safety service" in the industry, provide users with professional consulting, engineering and training services in the field of mechanical safety, and advocate " Let professional people do professional things".
Arc can be divided into "good arc" and "bad arc". The so-called "good arc" is an arc that occurs under normal conditions of electrical equipment, such as between the brushes of a DC motor and the commutator, switches or contactors that turn on and off the load circuit. "Bad arc" is a faulty arc, which can be divided into three categories:
Class A-series arc, which occurs in the same phase;
Type B-parallel arc, which occurs between phases;
Class C-the arc to the ground occurs between the front and the neutral line to the ground, namely leakage.
IEC/EN 60204-1 Fire protection requirements in electrical safety
Low-voltage inverters talked about how to plan and install electrical circuits for industrial machinery in accordance with the specifications to prevent electrical fires? The electrical safety specification for industrial machinery IEC/EN 60204-1 gives an answer. The specification also starts with the three elements of fire, and makes provisions for the selection of components, equipment and installations of the electrical system of industrial machinery:
Prevent arc fire source:
Insulation damage causes "bad arcs". For this reason, IEC/EN 60204-1 requires the electrical equipment of equipment to prevent sharp objects from damaging the insulation.
Poor joints may lead to "bad arcs". For this reason, IEC/EN 60204-1 requires that the connection of wires can only be through the terminal block, not through crimping terminals or splicing.
Prevent combustibles
When the parts in the electrical cabinet are not selected properly, it will lead to the extension of the fire. In order to prevent the occurrence of this situation, IEC/EN 60204-1 requires all electrical components to conform to their corresponding IEC specifications to ensure that electrical components All are made of flame-retardant materials.
As experts in human, machine and environmental safety, we rely on years of accumulation in the field of mechanical safety, and first put forward the concept of "safety service" in the industry, provide users with professional consulting, engineering and training services in the field of mechanical safety, and advocate " Let professional people do professional things".
