Page 9 (40)
Rev 1 2018-03-21 www.elcon.se
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3.2 CONNECTIONS FOR A RESISTANCE MEASUREMENT OF A BREAKING UNIT.
3.2.1 SAFETY REGULATIONS.
When only one side of the breaker is connected to earth (ground), special precautions must be observed. To protect
service personnel and the measuring equipment from surges, the following important rules must be followed closely.
• The SA10A case must be earthen (grounded).
• All circuit breaker connections and disconnection’s must be made only while the breaker poles are closed and
connected to earth (ground) on least one side.
• To avoid unintentional breaker operation! Never do any work on a circuit breaker unless the control circuits of the
breaker are disconnected from the SA10A control outputs.
• Use of touch-protected connectors is required for personal safety.
• 200A Red Pole of SA10A is connected to chassis ground, and must be connected to the grounded side of the breaking
unit. See figure 2.4 below
3.2.2 CONNECTION .
Use a connection cable with an area of 25mm² or more, to connect from the 200A current generator to the
breaking unit that is going to be measured.
Important!
200A Red Pole of is connected to chassis ground, and must be connected to the grounded side of the breaking
unit. See figure 2.4
Important!
Keep the two measuring wires connected to Ur+ and Ur- near together (twisted) as long as possible to reduce
interference and get a good measuring result.
Note!
If there is a current transformer (CT) in the circuit, the 200A current from SA10A shall if possible be connected so that the
200A measuring current not go through the CT. If that not possible, the secondary windings of the CT must be short
circuit and the CT must be demagnetized after done test.
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