Published On: Wed, Feb 10th, 2021

Practical problem of connecting a low voltage manual switch for high currents with a solution

Author: Radoje Jankovic

Pictures are from my friends.

Problem text

Figure 1&2 shows the cable lug for cable cross-sections of 240 mm2 to be connected to the connection terminals of the manual low-voltage power switch in one distribution cabinet. Since the 240 mm2 foot as shown in the figure cannot fit under the switch connection screw, how would you solve this on the spot?

Fig. 1.
Fig. 2.

Solution of the problem

The problem can be solved by using narrower cable lugs for the same cross section as seen in Fig. 3 and FIG. 4.

Fig. 3.
Fig. 4.
Fig. 6. Example from practice incoming single 240 mm2 cables in a switchboard
Fig. 4. Example from practice. Outgoing cables from manual three pole three-phase power switch.

It can also be solved by using prefabricated sockets made of profiled galvanized or non-galvanized copper, which are shown in Fig. 5.

Fig. 5.

It should be emphasized here that the manufacturers of these switches also supply the switch and the connecting elements. Some, unfortunately, do not do that, or the switch customer does not state that in their order request.

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Practical problem of connecting a low voltage manual switch for high currents with a solution