Did you know that 30% of power disturbances on the installation is not caused by overload or short circuit, but due to disruption of isolation? Equipment and wiring insulation is bad, or used the wrong tool can cause damage to equipment (fire) and humans (death).
The risk of fire.
The main result of the interference current through the conductors or other equipment is not expected to receive a stream is an abnormal increase in temperature. High temperatures can cause damage to the cable or even a spark of fire in the material, then burned.
The risk of death
This occurs in humans and is also called "Electrocution". Electrocution is the flow of current to the human body, and very dangerous. Two current flow damage vital body functions : respiration and heart rate. The study states the risk scale based on two factors : the rated current and duration of contacts.
Type of protection provided by the device leakage current
Leakage current devices provide two kinds of security :
Human Safety :
Type of protection provided by the device leakage current
Leakage current devices provide two kinds of security :
Human Safety :
Direct contact
Occurs when a man holding a straight wire or cable-voltage phase. Safeguards against the risk of direct contact can be:
- Phase voltage cable insulation
- Crib panels, etc.
But however it is recommended that any additional security, in other words using the device leakage current to prevent the risk of electric entry into the human body. To that end, the IEC standard has now been set mounting device leakage current with a sensitivity of 30 mA if human security is needed. (Sockets, electrical installations etc. bathroom.). Where leakage current device will automatically trip if the detected leakage current exceeds the threshold of 30 mA.
Indirect Contact
Occurs when people hold the metal part of voltage due to insulation failure. The amount of leakage current depends on the leak resistance and neutral connection. Leakage current will return to the source through security or through the earth conductor. Therefore, the device leakage current with a sensitivity of 30 mA is highly recommended as a safety net of indirect contacts,
Safety Equipment
It is known that the flow of 500mA at two points of contact of two adjacent metal-voltage can cause a spark. Whatever the grounding system is used for security against fire must be equipped with security sensitivity: IDN <300 mA.
How to choose a ELCB?
Safety Equipment
It is known that the flow of 500mA at two points of contact of two adjacent metal-voltage can cause a spark. Whatever the grounding system is used for security against fire must be equipped with security sensitivity: IDN <300 mA.
How to choose a ELCB?
To select the device leakage current, which must be considered is the function of each of these devices the leakage current.
ELCB (Earth Leakage Circuit Breaker)
ELCB (Earth Leakage Circuit Breaker)
This product has only one function, to detect leakage current. There is no safety thermal and magnetic ELCB must be protected from short circuit by the MCB upper side. ELCB should not be installed if possible exceed 6kA short circuit. ELCB can be combined with the tool (auxiliary) such as: OFS, MX, MN that provide long-distance signaling and trip distance. ELCB trip has its own mechanism and can also be operated manually like a switch. This tool is used if the security necessary leakage current at the maximum circuit group consists of 4 circuits. To select the device leakage current, which must be considered is the function of each of these devices the leakage current.
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