CEPT T TR 02-06 E-1986 Environmental Conditions for Telecommunications Equipment at Weather- Protected Locations (Excluding Telecommunication Centres with Temperature and Humidity .pdf

1、CEPT T/TR*OZ-Ob*E 2326434 OOL052Y b W 0 TTR02-06E Page 1 Recommendation T/TR 02-06 (Montpellier 1984, revised in Odense 1986) ENVIRONMENTAL CONDITIONS FOR TELECOMMUNICATION EQUIPMENT (EXCLUDING TELECOMMUNICATION CENTRES WITH TEMPERATURE AND HUMIDITY CONTROLS) AND IN THE OPEN AIR AT WEATHER-PROTECTED

2、 LOCATIONS Recommendation proposed by Working Group T/WG 12 “Transmission” (TR) Text of the Recommendation revised adopted by Commission “Telecommunication”: “The European Conference of Posts and Telecommunications Administrations, Considering - that some equipment used for telecommunication purpose

3、 is placed at weather-protected locations which are not - that in view of the installation of equipment made by different manufacturers, it is necessary to define the - that the relevant CCITT and CCIR Recommendations do not provide for the necessary standardization, - that the CCITT and CCIR do not

4、 plan to standardize the environmental conditions at weather-protected locations or in the open air, - that the Administrations support the harmonization of telecommunication equipment and systems which could lead to a reduction in the development and production costs for the manufacturers supplying

5、 equipment to different countries, that the Administrations prefer the use of natural convection cooling whenever possible, telecommunication centres with temperature and humidity controls and some in the open air, environmental conditions at these locations, O Recommends that members of the CEPT ad

6、here to the specifications for environmental conditions at weather-protected locations and in the open air contained in the annex of this Recommendation.” Edition of September 1, 1986 1 3 CEPT T/TR*OZ-b*E 232b4L4 0010525 B T/TR 02-06 E Page 3 Table of contents 1 . LOCATIONS AND EQUIPMENT CONCERNED 4

7、 2 . OBJECTIVES . 4 3 . DEFINITIONS 4 3.1. Open air 4 3.2. Weather-protected location 4 4 . SPECIFICATIONS . 4.1. Measurements of temperature and humidity 4.2. Climatic conditions for telecommunication equipment at weather-protected locations 4.3. Climatic conditions for telecommunication equipment

8、in the open air . 4.4. Biological conditions at weather-protected locations and in the open air 4.5. Chemically active substances at weather-protected locations and in the open air . . 4.6. Mechanically active substances at weather-protected locations and in the open air . 4.7. Mechanical conditions

9、 at weather-protected locations . 4.8. Mechanical conditions in the open air O . 4 . 4 5 . 7 . 9 . 9 . 10 . 11 . 11 CEPT T/TR*OZ-Ob*E m 232b414 001052b T m TITR 02-06 E Page 4 1. 2. 3. 3.1. 3.2. 4. 4.1. LOCATIONS AND EQUIPMENT CONCERNED The specifications apply to all equipment placed at weather-pro

10、tected locations usually without continuous- ly controlled climate and in the open air. This includes telecommunication centres without temperature and humidity controls. Other specifications (Recommendation T/TR 02-03) deal with environmental conditions and equipment in telecommunication centres wi

11、th temperature and humidity controls. Note: Conditions for equipment installed at subscribers premises are not dealt with in this Recommendation. Information on terminal equipment can be found in Recommendation T/CS 34-06. OBJECTIVES - To define climatograms for the different types of open-air clima

12、tes for the entire area of Europe. - To define the environmental conditions for equipment placed in the open air. - To define a limited number of climatograms for weather-protected locations, so that for each particular - To define the environmental conditions for equipment placed at weather-protect

13、ed locations. - To define the environmental conditions for transport and warehousing of the equipment concerned. -To define severities which will have a low probability of being exceeded. All specified values are maximum or limit values. These values may be reached but not occur permanently (I E C 7

14、21-3-3, 1). Note: The environmental classification for transport and warehousing will be defined at a late date in a single unified document. application a suitable one can be chosen by the user. DEFINITIONS Open air Open air is a location at which the equipment is not protected from direct weather

15、influences. It is often called a “not weather-protected location”. Weather-protected location A location at which the equipment is protected from direct weather influences. At an enclosed location direct weather influences should be excluded completely. At a sheltered location there may be additiona

16、l influences from wind-driven precipitation, dripping water, airborne contamination, etc. SPECIFICATIONS Measurements of temperature and humidity The air temperature and the humidity should not be measured near or above or inside technical equipment. The measuring points should be chosen such that t

17、he thermal effect of the equipment does not influence the result of the measurement. In the open air the temperature and humidity should be measured at 2 m above the ground. The temperature should be measured with equipment that absorbs a minimum of thermal radiation. The error of measurement should

18、 not exceed 0.5” K. The measurement error of relative humidity should not exceed f 5%. Edition of September 1, 1986 CEPT T/TR*02-0b*E 2326434 0030527 3.m T/TR 02-06 E Page 5 4.2. Climatic conditions for telecommunication equipment at weather-protected locations The climatic conditions at a weather-p

19、rotected location are affected by the open-air climate, the type of building construction and the type of climate controlling system (if any). To specify only one harmonized climatogram for such locations would lead in many cases to an overdesign of equipment. For this reason the climatograms in Fig

20、ures 1 (T/TR 02-06) to 4 (T/TR 02-06) are recom- mended, so that for each particular application the user can choose a suitable one. Within the limits of the climatograms the equipment must operate and it must meet the requirements laid down in specifications. There is, however, a small probability

21、of about 1 % that these limits will be exceeded. The behaviour of equipment when the limits are exceeded, as well as the specifications of more severe climatograms that are not exceeded (similar to those shown in Figures 5 (T/TR 02-06) to 9 (T/TR 02-06) with dotted lines), and the values of probabil

22、ity remain under study. The climatograms are valid for the whole area of Europe and up to an altitude of 2,000 m. The conditions described by the climatograms do not consider the effect of direct sun radiation and other parameters. Equipment dissipation has been taken into account but the user shoul

23、d consider the total heat load. This means that the administration or the end user is responsible for the limits of the climatogram not being exceeded because of equipment dissipation. To define the environmental conditions to which equipment is subjected, it is necessary to add the following inform

24、ation to that contained in the climato- grams : - Rate of change of temperature: 4.2.1. Additional conditions O 0.5“ C/min for the climatograms in Figures 1 (T/TR 02-06) and 2 (T/TR 02-06); 1 .O“ C/min for the climatograms in Figures 3 (T/TR 02-06) and 4 (T/TR 02-06). Note: The values have been aver

25、aged over a period of 5 minutes. - Low air pressure: 70 kPa (equivalent to a height of 3,000 m) which would allow for transportation by air in pressurized holds. - High air pressure: 106 kPa. - Solar radiation: 700 W/m2 for the climatograms in Figures 1 (T/TR 02-06) and 2 (T/TR 02-06), 1120 W/m2 for

26、 the climatogram in Figure 3 (T/TR 02-06), negligible for the climatogram in the Figure 4 (T/TR 02-06). - Sky radiation: maximum levels of sky radiation are given in Doc. I E C 721-2-4. On cloudless nights when the sky radiation is very low, objects exposed to the sky will attain surface temperature

27、s below that of the surrounding air temperature. As an example it has been found that the surface of a horizontal disk thermally insulated from the ground exposed to the sky during a clear night can attain a temperature of - 14C when the air temperature is 0C and relative humidity close to 100%. - H

28、eat radiation conditions: 600 W/m2 e.g. in the vicinity of room heating systems. - Movement of surrounding air: 5.0 m/s. Conditions of wind-driven rain, snow, hail, etc. only for the climatograms in Figures 3 (T/TR 02-06) and 4 (T/TR 02-06). - Conditions of water from other sources than rain: drippi

29、ng water, spraying water. - Conditions of icing. Notes: 1. More severe conditions may have to be taken into account in particular cases. 2. The values listed are those which will have a low probability of being exceeded, e.g. 0.01. Edition of September 1, 1986 CEPT T/TR*OZ-Ob*E 2326414 0010528 3 Rat

30、e of change of temperature Low air pressure High air pressure Solar radiation Heat radiation T/TR 02-06 E Page 6 C/min 0.5 (*) 1.0 kPa 70 kPa 106 W/m2 700 (*) 1,120 W/mZ 600 Classified I E C-values Environmental parameter at weather-protected locations Movement of the surrounding air I m/s I 5.0 Con

31、ditions of condensation 1-1 Yes I - I Yes (*I Conditions of precipitation (rain, hail, snow, etc.) Rain intensity I mm/min I - Low rain temperature I “C I Conditions of water from other sources than rain I- I Dripping Conditions of icing and frosting I - 1 Yes (*) Value for partly temperature contro

32、lled (Figure 1 (T/TR 02-06) and not temperature controlled (Figure 2 (T/TR 02-06). (*) Only at locating not temperature controlled with heat-trap (Figure 3 (T/TR 02-06) and without heat-trap (Figure 4 (T/TR 02-06). 4.2.2. Partly temperature controlled locations The climatogram of Figure 1 (T/TR 02-0

33、6) applies to an enclosed location having partial temperature control and no humidity control. Heating may be used to raise low temperatures especially where there is a large difference between the conditions of this climatogram and the open-air climate. Building construction is designed to avoid ex

34、treme high temperatures. This climatogram applies to locations: Where installed products may be exposed to solar radiation and heat radiation. They may also be exposed to movements of surrounding air due to draughts in buildings, e.g. through open windows. They may be subjected to condensed water, t

35、o water from sources other than rain and to icing. They are not subjected to precipitation. The conditions of this climatogram may be found in some entrances and staircases of buildings, in garages, cellars, certain workshops, building in factories and industrial process plants, unattended equipment

36、 stations, certain telecommunication buildings, ordinary storage rooms for frost resistant products, farm building, etc. Note: Underground spaces, manholes, etc. This climatogram can be used in these locations although the distribution and duration of severities are different. The relative humidity

37、exceeds 95% RH for more than 1% of the time and may reach 100% RH. The climatogram of Figure 2 (T/TR 02-06) applies to weather-protected locations having neither tempera- ture nor humidity control. The location may have openings directly to the open air, i.e. may not be completely closed. The climat

38、ic conditions may be affected to a varying extent by the conditions of the open-air climate and the type of buildings, e.g. in open-air climates: warm temperate, warm dry and mild warm dry or when the construction of the buildings provides long thermal time constants. This climatogram applies to loc

39、ations: Where installed products may be exposed to solar radiation and temporarily to heat radiation. They may also be exposed to movements of surrounding air due to draughts e.g. through doors, windows or other openings. They may be subjected to condensed water, to water from sources other than rai

40、n, or to icing. They may also be subjected to limited wind-driven precipitations, including snow. The conditions of this climatogram may be found in some entrances to buildings, some garages, some shacks, unattended equipment -stations, unattended buildings for communication purposes, etc. 4.2.3. No

41、t temperature controlled locations Edition of September i, 1986 CEPT T/TR*02-0b*E W 2326434 0030529 5 4.3. TJTR 02-06 E Page 7 4.2.4. Not temperature controlled locations, with heat-trap The climatogram of Figure 3 (T/TR 02-06) applies to weather-protected locations having neither tem- perature nor

42、humidity control. The location may have openings directly to the open air, i.e. may not be completely closed. The effect of direct solar radiation and heat-trap conditions exists. This climatogram applies to locations: Where installed products may also temporarily be exposed to heat radiation. They

43、may be exposed to movements of surrounding air due to draughts e.g. through doors, windows or other openings. They may be subjected to condensed water, to water from sources other than rain, or to icing. They may also be subjected to limited wind-driven precipitations including snow. The conditions

44、of this climatogram may occur in some sheds, shacks, lofts, telephone booths and some buildings, etc. Not temperature controlled, naturally ventilated locutions, without heut-trup The climatogram of Figure 4 (T/TR 02-06) applies to the same type of weather-protected locations as described by the cli

45、matogram of Figure 3 (T/TR 02-06) with the exception that the direct solar radiation and heat-trap conditions do not exist and natural ventilation is provided. 4.2.5. 4.3. O Climatic conditions for telecommunication equipment in the open air The conditions which are defined in the climatograms of Fi

46、gures 5 (T/TR 02-06) to 9 (T/TR 02-06) should be used taking into account direct sun radiation and other parameters. The climatograms describe the air temperature and the humidity in the different climatic areas of Europe: Figure 5 (T/TR 02-06): Figure 6 (T/TR 02-06): Figure 7 (T/TR 02-06): Figure 8

47、 (T/TR 02-06): Figure 9 (T/TR 02-06): The envelope of the 5 climatograms includes all the conditions that may occur anywhere in Europe. Note to Figures 5 (T/TR 02-06) und 6 (T/TR 02-06: The lower temperature limit of the mean value of annual extreme values has been set to -4OC, even though lower tem

48、peratures down to -45C can occur in some Nordic countries. All the climatograms are valid up to an altitude of 2,000 m. Limit of the mean value of annual extreme values This limit is obtained by plotting all values of air temperature and associated relative humidity over a period of one year. The me

49、asurements should be taken at a location which is representative of the geographical area as a whole. A boundary line is then drawn through the most peripheral (extreme) plots appearing on the diagram. The boundary line representing the mean value of annual extreme values is the mean line between the boundary lines obtained by this procedure for each of the years (at least 10 years). For more details see IEC Publication 721-2-1 (1981). The equipment must operate within the limits of the mean value of annual extreme values and it must meet the requirements laid down in specificati