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Study of the role of the earth and a residual current circuit-breaker

Set of modules for studying the role of the earth and an RC circuit-breaker.

Educational objectives
• Make students aware of electrocution risks in the event of indirect contact.
• Make students aware of risks related to the quality of the earth.
• Explain the role of the RC circuit-breaker 30mA in a domestic installation.

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The synoptic diagrams on the modules show the path of electrical energy from a transformer substation and a house. Resistive dipoles, for insertion in the modules, allow students to simulate two earth resistance values and two fault resistance values. To prevent any risk of electrocution to the student, the modules operate at extra-low voltage using an isolating transformer to standard NFC61558.

Comprises
• 1 Transformer module 230V AC, 24V AC. A printed diagram shows the public network, with its medium/low voltage transformer substation, and the neutral to earth connectionin this substation.
• 2 Modules of transmission lines from the transformer substation to a domestic installation.
• 2 Modules with the RC circuit-breaker 30mA, and a washing machine simulation.
• 1 Module with a printed diagram of a person, equipped with a LED on the heart.
If a dangerous leakage current flows, the LED comes on.
• 1 Dipole support module. Two earth resistances (100 ohms and 5 ohms), 2 fault resistances (10 ohms and 2 kohms) and four blanks so you can use your own resistance values.
• 1 set of safety leads for carrying out the different practical works. Mains power supply 230V - 50/60Hz. 3-metre lead with plug 2P+E.

 

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