BZ, option 2

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Uploaded: 17.09.2013
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Question 13 Measures to combat noise in the workplace. Cases of application of the method of sound insulation and sound absorption
Question 23 Requirements for steam boilers, process furnaces and other installations operating on gaseous fuel. Conditions for safe operation of gas equipment and compressor installations
Problem 3. The calculation of protective grounding of electrical equipment.
Initial data:
The total capacity of the equipment of more than 100 kVA
Natural earths are not available.
Type of electrical and the neutral - 1000 V with grounded neutral.
Ohm Resistance
Climate zone - 2.
The soil - clay.
Characteristics of earthing - tube diameter 40 mm, length 2.5 m.
The ratio between the distance to the grounding of the long - 3 =
Location of earth - the contour.


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