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installation or section from every source of electrical energy for
reasons of safety.
6. All cables installed less than 50 mm from the surface of a wall
or partition (in the safe zones) if the installation is not
supervised, and also at any depth if the construction of the wall
or partition includes metallic parts.
7. The amount of derating depends upon the shapes of the
conductors, the insulator height, and the insulator homogeneity.

5 Make the following phrases complete.

1. The DC machine can produce a nearly constant … .
2. A series resistor can be added to the field circuit to provide the
means for … .
3. The neutral and Earth conductors are separately distributed
to … .
4. Special measures must be taken for the loads or parts of the
installation causing high … .
5. The subtransmission system is also sometimes designated to
indicate … .
6. Circuit breakers, … are protection devices.
7. Both the short-circuit making capacity as well as the short-
circuit breaking capacity of circuit breakers must be … .
8. Data regarding devices for backup protection are given in … .

9. When replacing these types of breakers, the retaining bolts or
machine screws will have power on them unless … .
10. Conductors for the supply and load are typically secured to
the breaker using … .

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