The smallest allowable sections of cables and wires of electrical networks in residential buildings. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The smallest allowable sections of cables and wires of electrical networks in residential buildings. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electrician's Handbook

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The smallest allowable sections of cables and wires of electrical networks in residential buildings:

Line names	The smallest section of cables and wires with copper conductors, mm2
Group network lines	1,5
Lines from floor to apartment shields and to the settlement meter	2,5
Distribution lines (risers) for supplying apartments	4

Publication: electro.narod.ru

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Jellyfish as fertilizer 06.11.2018

The unsalted and dried remains of jellyfish is an organic fertilizer that increases the nutrient content of the soil and also reduces the growth of weeds.

This conclusion was reached by Japanese scientists who began to use jellyfish fertilizer in rice fields. This use was found by jellyfish after they flooded the surrounding waters, interfering with fishing.

Moreover, this problem is relevant not only for Japan. The FAO report says that the rapid growth of the jellyfish population has become one of the possible reasons for the depletion of fish stocks in the Mediterranean and Black Seas. Jellyfish eat a large number of eggs and fry of fish, and overfishing leads to a further reduction in fish populations.

The use of jellyfish as a raw material for the production of organic fertilizers can reduce the population of jellyfish. To do this, jellyfish are crushed, desalinated and dried. Then they are applied to the soil before planting.

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In fact, raw materials for the manufacture of such fertilizers are also available in Ukraine. In the fall of 2017, the beaches of Odessa were filled with large koreneroti jellyfish. This year, a large number of giants were observed on the Zaporozhye and Kherson coasts of the Sea of Azov. Jellyfish were not only in the water, but along the entire coast.

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