JPH05146032A - Electric through member for wall or floor and the like - Google Patents

Abstract

PURPOSE:To attain execution of the method of fireproof construction for a wall or floor without decreasing an electrifying capacity by enlarging a conductor sectional area in a part inserted and a part in the vicinity of this inserted part, relating to the wall or floor, as compared with that in the other part, so that a hot spot phenomenon is prevented from being generated. CONSTITUTION:A bus duct 13 having a part 13b, wherein a conductor sectional area of a part inserted through a partitioning member 11 and of a part in the vicinity of this inserted part is formed larger than a part 13a not inserted through the member 11, is formed. Next, the bus duct 13 is inserted through a bus duct inserting hole 12, and a clearance between the inserting hole 12 and the bus duct 13 is packed with a filler 14 composed of heat insulating material of rock wool or the like. Then, both internal and external surfaces of parts of inserting the bus duct 13 of the partitioning member 11 are interposed by fire resistant partitioning plates 15, 15 of calcium silicate plate or the like. In order to fill up a clearance part between the partitioning plates 15, 15 and the bus duct 13, heat insulating seal materials 16, 16 are additionally provided to be built up. In this way, an electric through member of the bus duct or the like can be suppressed from its temperature rise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric penetrating member such as a bus duct or a cable for penetrating a wall or floor, and is particularly used for penetrating a fireproof compartment. The present invention is characterized in that the fireproofing method for the wall or floor can be executed without reducing the current-carrying capacity.

[0002]

2. Description of the Related Art Conventionally, as a method for penetrating a bus duct to a fireproof compartment, there is one shown in FIG. 2, which has the following construction. A bus duct penetrating hole 2 is opened in the wall 1 and the bus duct 3 is penetrated through the penetrating hole 2. In the gap between the through hole 2 and the bus duct 3,
In order to prevent the spread of fire, a filler 4 made of a heat insulating material such as rock wool is packed. After that, the inner and outer surfaces of the portion of the wall 1 that penetrates the bus duct 3 are sandwiched by fire-resistant partition plates 5 and 5 such as calcium silicate plates, and further, the gap between the partition plates 5 and 5 and the bus duct 3 Heat-resistant sealing materials 6 and 6 are piled up and attached in order to fill the gap. The above-mentioned construction method is widely used and has a sufficient effect of preventing the spread of fire.

However, not only the above-mentioned construction methods but also the conventional fire-prevention construction methods have a primary purpose to prevent the spread of a fire. The part is wrapped with a heat insulating material (filler 4). Therefore, the heat dissipation of the wrapped portion in the bus duct is significantly hindered, the temperature rise of the portion is significantly increased, and the so-called hot spot phenomenon is inevitably generated.

[0004]

Generally, when the wall or floor has a thickness of 100 to 150 mm or less, the permissible current of the bus duct is reduced by about 10% at most, which is not so large. However, when the thickness exceeds 300 mm, the permissible current drops significantly. The degree of the decrease depends on the size of the bus duct, and the smaller the capacity is, the larger the degree of decrease in the allowable current is. For example, the wall thickness is 1
At 000 mm, the allowable current may be less than half the rated current.

Therefore, the design is performed without considering the hot spot phenomenon described above. When constructed, the bus duct was burned by Joule heat in the fire protection method part that was applied to prevent the spread of fire. It contains a serious problem that may cause a short circuit and, in the worst case, a fire from the relevant part.

For this reason, conventionally, a design has been adopted in which the allowable current of a portion penetrating a wall or the floor is expected to decrease and the allowable current of the entire trunk line is increased. Specifically, 100
To pass a current of 0 amps would require a 2000 amps size bus duct, and thus would be extremely uneconomical. The present invention is intended to solve the above-mentioned problems in the prior art.

[0007]

In an electric penetration member such as a bus duct or a cable, a conductor cross-sectional area of a portion to be penetrated through a wall or floor or the like and a portion in the vicinity thereof is made larger than that of other portions. As a result, the amount of heat generated in the relevant portion due to energization is reduced, and the temperature rise of the electrical penetration member such as the bus duct is suppressed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of the present invention implemented as a bus duct. In this embodiment, the construction of the fire protection method itself is no different from that of the conventional example shown in FIG. However,
A portion of the bus duct that penetrates the floor or the wall and its vicinity are configured to have a larger conductor cross-sectional area than a portion that does not penetrate. The present invention adopts such a configuration as a main part of the invention.

In FIG. 1, 11 is a partition member such as a wall or floor, 12 is a bus duct through hole opened in a required portion of the partition member 1, and the bus duct 1 is provided in the through hole 12.
Penetrate 3 Then, a filler 14 made of a heat insulating material such as rock wool is packed in the gap between the through hole 12 and the bus duct 13 to prevent the spread of fire. After that, the refractory partition plate 1 such as calcium silicate plate is formed on both inner and outer surfaces of the partition member 11 that penetrates the bus duct 13.
5 and 15, and heat-resistant sealing materials 16 and 16 are raised and attached to fill the gap between the partition plates 15 and 15 and the bus duct 13. A portion 13a that does not penetrate the portion of the bus duct 13 that penetrates the partition member 11 and the vicinity thereof.
It is configured to be a portion 13b having a larger conductor cross-sectional area.

By the way, it is well known as Joule's law that the amount of heat generated by energization is proportional to I ² R, where I is the energizing current and R is the resistance of the conductor. According to the present invention, the conductor resistance of the penetrating portion with respect to the partition member 11 and its vicinity can be reduced based on the above-described configuration, that is, the formation of the portion 3b having a large conductor cross-sectional area, and the amount of heat generated It becomes possible to reduce the size.

Conventionally, a method of suppressing a temperature rise in a portion penetrating a fireproof compartment has been technically developed in order to improve the dissipation of generated heat. On the other hand, the present invention has a unique idea that only the portion having poor heat dissipation is locally reduced in amount corresponding to the amount of heat generated in the portion (smaller than other portions). Will be eliminated by. In other words, the conventional idea is to solve the treatment of heat generated based on improvement of heat dissipation, whereas the present invention is based on suppression of heat generation itself. ..

The degree of increase in the conductor cross-sectional area and the overall length of the portion where the conductor cross-sectional area is increased vary depending on the wall thickness, the type of fireproof compartment, the allowable current of the bus duct, and the like. Therefore, these set dimensions are calculated by taking into account the heat generation amount, heat conduction, and heat dissipation.

Although the embodiment for the bus duct shown in FIG. 1 has been described above, the present invention can be applied to a general cable. That is, in order to increase the conductor cross-sectional area of the portion that penetrates the wall or floor, by connecting cables of different sizes before and after the through portion, the conductor size (the diameter of the cable ), The present invention can be applied to a cable. As a means for increasing the conductor size, in addition to the connection of the large-diameter cable as described above, the portion may be configured to have a multi-story configuration depending on a plurality of cables.

[0014]

According to the present invention, in an electric penetration member such as a bus duct or a cable, a conductor cross-sectional area of a portion to be penetrated through a wall or a floor and the vicinity thereof is made larger than other portions. Therefore, since the amount of heat generated in the relevant portion due to the energization is reduced, it is possible to suppress the temperature rise of the electric penetration member such as the bus duct. Therefore,
The occurrence of the hot spot phenomenon in the penetrated portion is well prevented. That is, when a hot spot phenomenon occurs, the electric penetration member such as a bus duct in a portion penetrated by a wall is burned out due to Joule heat.
Although a short circuit occurs, in the worst case, a situation such as the occurrence of a fire from the relevant portion is caused, but the present invention eliminates such an accident.

Further, according to the present invention, the hot spot phenomenon as described above is prevented from occurring by increasing the conductor cross-sectional area only in a necessary portion of the electric penetration member such as the bus duct or the cable. For example, compared with the case where the conductor cross-sectional area of the electric penetration member such as the bus duct or the cable is increased over the entire length, the manufacturing cost can be reduced, which is extremely economical.

Further, when the suppression of the temperature rise in the portion penetrating the fireproof compartment is constructed so as to depend on the improvement of the dissipation of the generated heat as in the prior art, the special dissipation is required for the heat dissipation. However, since the present invention takes the form of suppressing the amount of heat generated, such a technique and equipment are not required at all.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention for a bus duct.

FIG. 2 is a cross-sectional view showing an example of a conventional penetration construction of a bus duct.

[Explanation of symbols]

 11 partitioning member 12 hole for passing through bus duct 13 bus duct 13a part that does not penetrate 13b part with enlarged conductor cross-sectional area 14 filling material 15 fire-resistant partition plate 16 heat-resistant sealing material

Claims (1)

[Claims] 1. In an electric penetrating member such as a bus duct or a cable, electric conduction is achieved by increasing a conductor cross-sectional area of a portion penetrating a wall or floor or the like and a portion in the vicinity thereof as compared with other portions. An electric penetrating member such as a wall or a floor, which is configured to reduce the amount of heat generated in the relevant part due to the above.