On The Technical Conditions For The Implementation Of Protection Cap

Original Language Title: o technických podmínkách provedení protivýbuchových uzávěr

Read the untranslated law here: https://portal.gov.cz/app/zakony/download?idBiblio=41435&nr=10~2F1994~20Sb.&ft=txt

10/1994 Coll.



The DECREE



The Czech Mining Authority



of 6 December. December 1993,



laying down the technical conditions for the implementation of the protection Cap

dust and water



Change: 361/2009 Sb.



The Czech mining Office lays down pursuant to section 6 (1). 6 (a). Czech law)

the National Council No. 61/1988 Coll. on mining activities, explosives and

the State Mining Administration, as amended by the Act of the Czech National Council No. 425/1991

Coll., Act of the Czech National Council No. 542/1991 Coll. and Act No. 171/1993

Coll.:



Part the first



General provisions



§ 1



The range of validity of the



(1) this Ordinance provides for the establishment of passive protection

the closing of the coal mines and lignitových with danger of explosion of coal

or lignitového.



(2) this Ordinance has been notified in accordance with the directive of the European

Parliament and Council Directive 98/34/EC of 22 December 2004. June 1998 on the procedure for the

the provision of information in the field of standards and technical regulations and legislation

for information society services, as amended by Directive 98/48 EC.



§ 2



Interpretation of the terms



For the purposes of this Ordinance shall be deemed to



and passive locking device) protivýbuchovou in mine works intended for

prevent the transmission of the explosion of coal dust and methane gas fire-fighting rozmetáním

substance in the profile of the mine explosion pressure wave



(b)) the dust cap a series of dams located in the specified

distances in the profile of the mining works, on which is stored an inert powder,



(c)), a number of dams located in the closure set distances

in the profile of the mining works on which they are stored or suspended trays

or bags filled with water,



d) barrier passive anti-explosion closures structure in the transverse

profile of the mining works extending from one side of the mine to another

the side on which the extinguishing substance is intended to prevent the transmission of the explosion.

Extinguishing substance is stored either in an inert powder, or water in the

korýtkách or bags. Unless otherwise specified, are part of the

the dam at the water valve and the trays or bags filled with water, placed in the

other parts of the same cross-sectional profile of the mining works in order to better

coverage of the entire profile of the mining works.



§ 3



Determine the type and implementation of passive anti-explosion closures



(1) according to the fire-fighting substances used are passive anti-explosion

dust caps ("dust") or passive

anti-explosion closures, water ("water"). Water closures

It is divided into korýtkové and rolling lobe and depending on how the deployment of dams in

mine workings on the concentrated and cut.



(2) in the technological procedure ^ 1) for the management of mine workings must be

specifically processed way of protection against the transmission of the explosion of coal

the dust cap by using passive protection. Profile of the mining works

must be designed so that, given the projected deployment of equipment

transport and machinery, luten and space for walking was

the provisions of this Ordinance. Similarly, it must be processed by the way

protection against transmission of explosion of coal dust by using explosion

the CAP for the mining works already issued, if the obligation to these

caps in the mining work distribute.



Part the second



Dust caps



§ 4



A place for the position of the dust caps



(1) the dust seals must not be set up in places where water is pouring down

the ceiling, near junctions, sharp corners and in sections of the mine workings

with larger cross section changes against the average cross-sectional area of the mining works, in which

to establish a bond.



(2) for the determination of the average cross section mine is the decisive stretch

the mining works, in which the dust seal is located, and sections of the building

on this stretch in both directions. The length of the downstream sections of equal length

dust caps. The average cross section is calculated as the average of the light

the cross-section measured in the middle of this closures and on both ends of the downstream

sections.



(3) If it is necessary to enlarge the cross section of the mining works, to obtain

sufficient height for the location of the dust caps, must be performed from the

each of her party at a distance at least equal to the length of this

closures.



(4) in the space before and after the dust seal on the distance equal to the

its length must not be obstacles that substantially reduce the gauge

the mining works.



§ 5



Determination of the mass of inert dust in the dust uzávěře



(1) the mass of inert dust deposited on dams dust caps

must be specified so that the average cross-section of 1 m2 of the mining works

There were at least 400 kg of inert dust.



(2) the mass of inert dust navršeného on the dam to approximately

calculated according to the formula

(G) = 67. B2 (3) and (b),



where G is the mass of inert dust on the dam in kg,

and the length of the dam in meters,

(b) the width of the dam in meters.



§ 6



The construction of dams the dust caps



(1) the construction of the dam the dust caps must ensure its easy

capsize in case of explosion. Therefore, its parts must together nailing

and equipment of the mining works should not be an obstacle to its spreading. At the same time

must, however, be sufficiently stable against impacts during transport, blasting

work and the like.



(2) the dam is part of the dust caps:



and the supporting base-usually) wooden prisms imbedded on the reinforcement

the mining works so that they are always placed below the caps. Each

the dam must have separate bases according to annex No 1, which is

part of this Decree, a picture No 4,



(b) the transverse beams-usually) prisms or planks laid on the bearing

stand in the proper distance from each other at right angles to the axis of the mining works. As

beams shall not use Rails, balanced steel reinforcement arcs

and the like,



c) plates-freely laid wooden boards on the transverse beams forming the

table of the dam for the presence of inert dust. Plates with a width of maximum

20 cm are placed next to each other freely across to them, but not to each other

fit to dust was thrown as a whole, but blasted. The plates must

project the beam on each side of the light of at least 10 cm of dams,

heavy dams on at least 13 cm according to annex No 1, Figure 1 and 2.



(3) the dam is being built in the position of the horizontal and perpendicular to the axis of the mining works.



(4) the length of each of the dam must be such that stretched from one side of the

mining work to another. Beams and plates are not allowed in any place

touch support and equipment.



section 7 of the



Types of dams the dust caps



(1) according to the width of the dam, and as a result, the weight of the navršeného

inert dust are distinguished:



and about the width of the dam) light 35 cm. Weight of the dust on the dam is approx. 23

kg per 1 cm of its length in accordance with Annex 1, Figure 1,



(b)) of the dam with a width of 50 cm heavy weight of dust on the dam is approx. 45

kg per 1 cm of its length in accordance with Annex 1, Figure 2,



c) Dam hard double, where the dust is distributed from the middle to one and

on the other half of the dam so that the presence of dust in the overlapped

the axis of the mine after 30 to 35 cm in length as described in annex 3, which is

part of this Ordinance. These dams are used in mining works, where

the length of the dam is greater than 3 m, so the burden of dam inert dust

It is so great that there is no guarantee the correct distribution of reservoir pressure

the wave of the explosion.



(2) in wide sections of mine workings, where would the mass of inert dust

could cause any dents of transverse beams may be secured

the beams in the middle of the wire or chain to the ceiling of the mine.



§ 8



The overall composition and the length of the dust caps



(1) Dust builds up as bond bond focused. Her total

the length must not be less than 40 m.



(2) Dust seal consists of various dams, on which is stored

inert dust. The number of dams is determined by the weight of the

inert dust throughout the dust uzávěře.



(3) the distance between each of the dams is 1.5 m to 2 m. Just

exceptionally, where conditions do not allow compliance with the distance according to

Annex No 1, Figure 3, this distance may be reduced to 1 m.



(4) the dam the dust caps are placed in the upper third of the light

the cross-section of the mining works, with each cover at least 65% of the dam

the maximum width of the light cross section of the mining works.



(5) the first and last 2 to 3 dams are light (of a width of 35 cm),

the others are heavy (width 50 cm) according to annex No 1, Figure 3.

The same happens if the dust seal made of double

dams.



§ 9



Sprinkles of inert dust and its Exchange



(1) an inert dust on the dams must be freely and not be delved

udusán. Settles down to navršeném inert dust visible layer

coal dust must be removed and the inert powder to set

the weight added.



(2) if it Gets wet inert dust and ceases to be rozviřitelný, the

replace. When the Exchange first establish surplus dam with

navršením friendly inert dust, and then gradually replace

non-compliant dust on the individual reservoirs. During the Exchange must be in

uzávěře still navršeným a prescribed number of dams with an inert powder.
Similarly, must proceed even in the repair of damaged dams.



§ 10



Moving the dust caps



If the dust seal, you may move with demolition of the old

closures begin to position the new dust caps.



Part the third



Water closures



Part the first



Common provisions



§ 11



Trays and bags



(1) the trays and bags for the construction of a water seal must have a net volume

at least 40 l, must be made of plastic must have sufficient strength,

must not promote the spread of fire or be the cause of explosion by

static electricity; the tray must have a stable shape. These requirements are

be considered satisfied if the trays and bags meet at least the requirements of the

designated standards ^ 2) concerning the flammability of plastic, eliminating the risk of

static electricity and the methods and the requirements for non-electrical equipment ^ 3) for

potentially explosive atmospheres ^ 4).



(2) Trays and bags must, in the case of the explosion to ensure the release of the water

in the manner and at the time, which creates an effective fire-fighting effect. This condition is

deemed to comply with the requirements if the tray is at least the specified

^ 2) standards governing protective systems and explosion prevention in

deep mines ^ 4) or if the examination referred to in annex No 5 of this

order to ensure that trays and bags ensure defined spray water

When the set pressure of the detonation wave.



(3) The collected and the bag must be labeled by the manufacturer, its net volume and

height levels corresponding to this capacity. Collected in the levels and height

the bag must be controllable, the trays without removing the lid

the tray.



(4) a water bond can be built either from korýtek, in this case

It is a water seal korýtkovou, or just from the bags, in this case, the

This is the seal of water vakovou; It does not apply to the trough and the bag subsequently

pursuant to section 13 (3). 5.



§ 12



To populate the korýtek and bags of water



(1) the tray and bag water closures must be filled with at least such

the volume of water that corresponds to the appropriate character on the collected or bag.



(2) to limit evaporation of water from the tray must be used.



section 13



Density profile of the mining works



(1) the trays and bags of water closures in the cross-section of the mining works store

or hanging on the dams so as to cover at least 35% of the largest width

light works on the cross-section of the mining area to 10 m2, 50% of the largest width

light works on the cross-section of the mining area of 10 square meters to 15 square meters and at least 60% of the

the largest section width of the mine more than 15 m2; the bags can be

just hung. If the equipment does not allow for the deployment of mine korýtek

in one plane or the prevents the efficient dispersal of water into the mine's profile

the works can be placed in a trough more planes. Example deployment

is given in annex 2 to this Decree, pictures 2 and 3.



(2) the coverage of free spaces on the sides of the mining works,

uses the korýtek or bags stored or on media; bags

they may just be hung. Example of density is given in annex 2 to this

the Decree, Figure 3.



(3) the trays or bags of water closures are placed so that they do not touch

reinforcement, rigging or the side of the mine, nor each other. The total spaces

between in or bags and bags and the sides or in the mining

the work must not be greater than 1.8 m, with no gap between the korýtkem or

the bag and the side of the mining works must not be greater than 1.2 m, and between two

in or bags must not be more than 1.5 m. Spacing is measured between

vertical planes parallel to the longitudinal axis of the mining works interleaved

by the edge of the korýtek or bags. Examples of location korýtek and bags

are listed in annex 2 to this Decree, Figure 3, and in annex No.

4 to this Decree, Figure 3.



(4) the Dna korýtek located on the structure and the bottom corners of the suspended

the bag must not be above the počvou higher than 2.6 m or not bag any Trough

the parts interfere with the cross section for walking and transportation. In profiles, which is above the

in bags or free space greater than 1.5 m, placed more

the dam, for which the requirement of the first sentence shall not apply; for the location of the korýtek

and bags for more dam apply paragraph 3. Examples of location and korýtek

the bags are listed in annex 2 to this Decree, figures 2 and 3, and in the

Annex No 4 to this Decree, Figure 3.



(5) if the distance between the lower branches of the mining belt conveyor and

počvou greater than 0.75 m must be in this space in the place of each

at least one dam, trough or water-filled bag with a volume of at least

40 l. This trough or bag is not counted among the trays and bags by

paragraph 1 and the water collected in the bag or not to

the total volume of water in the water uzávěře.



§ 14



Location of korýtek in the dam



(1) the trays in the dam can be



and freely placed on the beams) or in the case of one tray to the carrier,



(b)) hung for his top edge in load-bearing frames.



(2) in the dam can be used freely trough the highest as well hung.



(3) beams, bars and frames are placed horizontally, perpendicular to the longitudinal axis of the

the mining works.



(4) the tray with the



and placing his or suspended) longer side at right angles to the longitudinal axis of the mining

work-saving or transverse suspension,



(b) placing or hanging their) longer side parallel with the longitudinal axis of the

the mining works-saving longitudinal.



(5) in a single dam may be laid lengthwise and crosswise the trays.

Lengthwise in the dam can be placed 50% korýtek; the greater the number of

only when the test is in accordance with the specified standards governing protective

systems and explosion prevention in deep mines ^ 4) or in accordance with

Annex No. 5 to this Decree authorized quenching effect of such arrangements.



§ 14a



The location of the bags in the dam



(1) Bags in the dam must be hung on curtain, keyless and beams

it in a way that preserves the available inlet hole and does not

physical violation of the bag.



(2) the Beams are placed horizontally, perpendicular to the longitudinal axis of the mining works.



(3) bags are hung only perpendicular to the longitudinal axis of the mining works.



§ 15



The supporting structure for the trays and bags of water closures



(5) the supporting frames for hanging korýtek consist of two parallel

beams made of wooden prisms, profiled steel tubes

where appropriate, the telescopic retractable, firmly United together by vertical

as a rule the rungs on both ends, to ensure their continued

the distance. The walls of the korýtek may not be the main frame covered to a greater height

than 6 cm.



(6) the carrier is still fastened to the frames using brackets or directly on the reinforcement

or the rock of the mining works.



(1) the supporting structure for the trays and bags of water closures, which are

load-bearing frames, beams and their bases, carriers, holders and their

anchorages must be rigid and strong enough to suit the purpose. In

broad sections of mine workings, where would any bending of the carrier

the structure could cause a shift korýtek or emptying water from them, can

be the deflection of the structure prevented her gripping the wire or

chain to the ceiling of the mine.



(2) the structure is fastened to the reinforcement of the mining works or on the

Compact rock mantle mining works.



(3) the supporting structure for the highest freely trough must ensure

a sufficiently large mounting face of the tray, with the date to avoid

deformation of bottom tray after its filling with water. With a combined store

the tray can be stored lengthwise pillow.



(4) the supporting frame for hanging up korýtek consists of two parallel beams

firmly United together by vertical bars, which provide their permanent

the distance. The walls of the korýtek may not be the main frame covered to a greater height

than 0.06 m.



(5) the supporting structure must be secured against movement in the longitudinal direction

the axis of the mining works. Ensure the support structure for example pouches is listed

in annex 4 to this Decree, Figure 5.



Part the second



Water closures concentrated



section 16 of the



The volume of water in the water uzávěře focused and its length



(1) the volume of water in the water uzávěře focused down so that the

It seemed at least 200 l per m2 of the average cross-sectional area of the mining works, in

where is this bond is located.



(2) for the determination of the average cross section mine is the decisive stretch

the mining works, in which the water bond concentrated located, and sections

building on this stretch in both directions. The length of each subsequent

the section is 20 m. Average cross section is calculated as the average of the light

the cross-section measured in the middle of this closures and on both ends of the downstream

sections.



(3) a water bond concentrated consists of the number of dams, in

which are placed the trays or bags filled with water. The adjacent

dams are placed so that the distance between the in and bags

the adjacent dams was 1.2 m to 3 m total length of water closures

concentrated must be at least 20 m.



(4) the total volume of water in the water uzávěře concentrated must be evenly

divided along the length of the closures so that it seemed to at least 5 l water

each section of the m3objemu mine, in which the bond is built.



§ 17



A place for the position of water closures concentrated and its adjustment
(1) the water bond focused to build as far as possible in a straight section of the

the mining works. In the space before and behind that seal on distance 20 m

must not be obstacles that substantially reduce the gauge of the mining

works.



(2) If it is necessary to increase the cross section of the mine, to obtain

sufficient height for the position of water closures concentrated,

made from each side at a distance of at least 20 m.



section 18



Moving water closures concentrated



If the water bond re-positioned, intent must be earlier than

begins to disassemble the old enclosure, built a new enclosure; Similarly,

When the movement of each of the dams.



Part the third



Water seals cuts



§ 19



The water bond split and its length



The water bond single consists of groups of dams with or in bags,

that are deployed continuously in mine workings by Annex 2 to this

the Decree, Figure 1. The distance between adjacent dams one

the group must be at least 1.2 m, but a group of dams may be in mine

the work spread in a length of 4 m Distance between groups of dams

may be the most 30 m, while the profile of the mining works up to 10 m2 50 m.



section 20



The volume of water in the dams group



In the Group of dams must be at least such a volume of water, in litres, how much

makes the volume of mining works in the m3 to the neighboring group of dams. The calculation of the

made for the sections in both directions from a group of dams and by higher

the value shall be determined by the volume of water in the dams to the group.



section 21



The smallest amount of water in the water uzávěře cuts



A water seal is considered to be only divided by such a bond, in which the

in groups divided by the volume of the dam forming the CAP water at least 200 liters

on average, each m2 of light cross section mine, in which a single

Bond built. The average cross section is calculated as the arithmetic average of the

in light of the measured cross section in the middle and at the end of the cut.



section 22



Transition of water closures in focus and vice versa



(1) when changing the water closures in focus and vice versa must be

the transition is executed so that the distance between them was greater than 30 m.



(2) a similar transition of water cuts the dust caps and vice versa is not

allowed.



Part the fourth



Final provisions



section 23



From the provisions of this Decree, it is possible to derogate on the necessary time in

cases where there is a risk of delay in the rescue of people or when

disposal of significant operational accident (accident) if they are carried out

the minimum security measures.



section 24



The effectiveness of the



This Decree shall take effect on the date of publication.



Chairman:



Ing. Bartos v.r.



Annex 1



Annex 2



Annex 3



Annex 4



Annex 5



The basic conditions for the testing of the effectiveness of the water seal in the experimental gallery



1



Introductory provisions for the examination of water closures



The test may be carried out by accredited testing laboratory. The result of the

the test shall be indicated in the test report. Water seals shall be tested

in the experimental gallery in model implementation of closures on the průšleh of the flame.



Trays and bags will meet the requirement for proper function, if the water

Bond compiled from them in accordance with this annex when the model test

the criterion of efficiency.



The criterion of efficiency test caps, the value is the intensity of the explosion

the flame sensor on the fotoelektrickém F7, located on the measuring point 7 (see

(fig. a). No. 1), which must be less than or equal to 10 mV.



2



Preparation of water closures for the exam



The water bond in the experimental gallery builds between the measuring points 4 and 5

(see fig. 1) of the three dams with or in bags, so that the 1 m2

the cross section of the gallery found it (40 +/-1) l of water. The first dam (in caps

the direction of the explosion) is placed at a distance of (64 +/-2) m from the face trial

the gallery. The length of water closures is (6 +/-0.1) m.



Location and arrangement of korýtek and bags of water seals shall be carried out according to the

pictures 1 and 2. Trays and bags are hung diagonally on the supporting structure

located in the upper third of the profile of the gallery with the fact that the distance between the

vertical planes interleaved outside of extreme korýtek or

bags must be at least 40% of the width of the cross-section of the largest light-experimental

the gallery. In the other, the provisions of part three of this order.



3



Preparation of equipment for explosive system



In the space between the face experimental adits and measuring point 2 is stored on

method the experimental gallery, 9 pieces of steel angle brackets (120 × 120 × 12 mm), each of

length of 4 m (see fig. 1). Angles to the invert, fixed so that each of the

they formed the trough and could be freely nasypán multiprach.



Angles to the invert, placed parallel to the axis of the Gallery so that the three are

next to each other in front of the face with the fact that one is in the Gallery, and the remaining two

to the right and to the left at a distance of 1 +/-0.1 m and six is in timeline

the Gallery towards the measuring point 2 (see fig. 1). Longitudinal distance

between the angles is (1 +/-0.1) m dust Zone ends at the measuring location

2.



To initiate detonation of explosives using black (this) dust (see chap.

1.4) vývrtový steel used a mortar and pestle, external diameter, length 1 531 mm

203 mm with a diameter of 57 mm and depth of the bore hole bore hole 992 mm located

approximately in the middle of the face.



The default amount of multiprachu at each angle is (10 +/-0.1) kg and

It may vary according to the instructions of the head of the test depending on the

dosahovaném pressure measuring point 4 in the measuring point was

obtain the required pressure value referred to above (see point 4).



4



Registration explosion pressures and flame



Explosion wave is generated by the explosion multiprachu.



The parameters of the test blasts are registered with the pressure and

fotoelektrickými sensor, T, F, in the places marked in the diagram in Fig. 3.

No 1 the numbers 1 to 7.



Due to the capacity of a measuring system are equipped with space with regard to

the need for registration. In addition to the starting part of the explosion in the tests

protection CAP is always on the indication of the pressure and the flame front

the roadblock and the flame for the seal.



Registration explosion pressures and the flame shall be carried out on the measuring

points 4 and 7.



The values of the other sensors which can be fitted to the other measuring

places, are informative and only allow you to qualitatively evaluate the

development of explosive transformation in a given space.



For the evaluation of the results of the test are crucial input parameters

the explosion, which the flame and pressure values are recorded in the measuring point 4

(the value of the intensity of the flame sensor on the fotoelektrickém F4

min. 500 mV, pressure (90 +/-20) kPa), and the value of the explosion flame in

measuring point 7 (values of the intensity of the flame on

fotoelektrickém F7 sensor max. 10 mV).



5



The conduct of tests



Multiprach is rozviřován of steel angles bleskovicí in time (0 to

140) ms (this time interval is given by using detonators DeM-S grade

0-6, by detonating in the three angle brackets on the face are initiated

detonators, detonating cords in degree 0 other angle brackets from the face

detonators degrees 1 to 6). Agitation of the multiprachu is provided so that

pieces of detonating cords length of 4.1-4.2 m adjustují detonators, the

on the bottom of the angles and evenly with a falling multiprachem. As follows rozvířený

dust in the Gallery creates an explosive concentration and is ignited and brought to

500 g explode bombs Vesuvitu TN of a pestle with a time delay, 750 +/-

50 ms from the beginning of the initiation of detonating cord detonator degree 0 (initiation of explosive charges

Vesuvitu TN executes the exploder DeD-with level 3).



(Fig. a). No 1 lay out the test in the experimental gallery



6



Evaluation of tests



In the explosion, detonation parameters must be reproducible, which

validates the measurement input pressure explosion waves in point 4, which must be

in the range (90 +/-20) kPa.



The explosions with the input pressure outside this interval are not counted.



Evaluates the file only 5 tests that meet a condition

required parameters of explosion.



From file 5 tests that meet the parameters with výbuchovými

requirements, must in all cases comply with criterion of the water bond

the relative effectiveness of the test, i.e. closures. the intensity of the explosion flame

the fotoelektrickém sensor F7 must be less than or equal to 10 mV. The tested

sample korýtek or bags in this case complies with and fulfilled the conditions

of the test.



7



Define other test conditions



7.1



Multiprach requirements



For the explosive system is used the dried Brown coal dust.

multiprach, the lower explosion limit max. 75 g. m-3 at initiation

energy Ei = 9 kJ and medium grain size max. 0.1 mm.



The value of Ei is measured with an accuracy of +/-10%. The quality of each new shipment

multiprachu must be demonstrated by an accredited test

the lab.



7.2.



Requirements for pressure sensor



The sensor used for measuring of pressure must have a valid

the calibration of the output signal, in the range of 1 to 10, measuring range 0 to min.

160 kPa, 150% overload capacity min., 0.6% accuracy of min and must have

temperature compensation (the values are given by the technical conditions).



7.3.



The requirements on the photoelectric sensor
For the measurement of flame sensors are used with spectral sensitivity in the

the area of 0.4 to 1.1 mikrom.



Photoelectric sensor must have a valid calibration.



7.4.



Requirements to climatic conditions



Climatic conditions in the section of the Gallery, where the tests will be carried out,

must correspond to the following values: temperature (15 +/-5) ° c, humidity

(95 +/-5%). The temperature and humidity must be measured at the face trial Gallery

and in the measuring point 7, and before the start of the trials.



(Fig. a). No. 2 Arrangement of bags of water closures



(Fig. a). No. 3 experimental Scheme Gallery



Selected provisions of the novel



Article. (II) Decree No. 361/2009 Sb.



Transitional provisions



1. Anti-explosion locks built in accordance with the requirements of the existing

legislation before the entry into force of this Decree in the mining works

related directly with the dobývanými or the likvidovanými faces and in

Mine works, whose life will be shorter 12 months,

be regarded as satisfying the requirements of anti-explosion closures of this order.



2. other explosions built before the caps the effectiveness of this

the decree must be brought into line with this Decree to the twelve

months from the acquisition of its effectiveness.



§ 39, paragraph 1). 1, § 43, paragraph. 2 and 3 of the Decree of the Czech Mining Authority no.

22/1989 Coll., on health and safety at work and safety

operation in mining activities and in the activities carried out by mining

in the underground, in the wording of later regulations.



2) Section 4a of the Act No. 22/1997 Coll., on technical requirements for products and on the

change and additions to certain laws.



for example, 3) ISO 4589-2 Plastics-determination of burning behaviour method

oxygen number-part 2: test at ambient temperature, from point of view

the risk of the emergence and spread of the fire, ČSN 33 2030 Electrostatics-Directive

to avoid the danger of static electricity and EN 13463-1

Non-electrical equipment for potentially explosive atmospheres-part 1:

The basic method and requirements, with a view to eliminating the risk of explosion

from static electricity.



4) for example, ČSN EN 14591-2 Protection and explosion prevention in

deep mines-protective systems-part 2: passive water korýtkové

closures.