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1、i - 2 -C*EIVEf r b GENERAL SECRETARIAT Rue Brt?derocre 2 . Bte 5 - 1 0 0 0 BRUXELLES TBI. ,o2 - 511 79 32 - TBlex 26257 C e n l e G b ELECTRICAL SHEET i 985-1 0-16 a ISSUE 1 . INSTALLATIONS OF BUIL 3404583 00052O4 5 8- ! HO 384.4.42 )INGS PART 4: PROTECTION FOR SAFETY CHAPTER 42: Protection against
2、thermal effects Installations lectriques des btiments. Quatrime partie: Protection pour assurer Ia scurit Chapitre 42: Protection contre Einflsse les effets thermiques Elektrische Anlagen von Gebuden Teil 4: Schutzmassnahmen Kapitel 42: Schutz gegen thermische f RD: IEC 364-4-42 (1980) edition 1, mo
3、dified This HO consists of the following: TITLE PAGE . TEXT prepared by CENELEC TC 64 date of ratification: 1983-04-13 date of announcement: 1986-01-01 date of latest publication: 1986-10-01 date of withdrawal: 1987-10-01 HARMONIZED NATIONAL STANDARDS: AT : SP (OVE-EN ld/l) BE : . CH : DE : DK : E S
4、 : FI : FR : GB : GR : IE : IT : LU : NOS NL : NO : PT : NOS S E : DIN 57 100 Teil 420/VDE 0100 Teil 420/11.84 Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECLicensee=Deere protective measures for indoor installations; safety requirements;
5、 thermal effects; protection against fire; definitions ELECTRICAL INSTALLATIONS OF BUILDINGS CHAPTER 42: Protection against thermal effects PART 4: PROTECTION FOR SAFETY Installations lectriques des btiments. Quatrime partie: Protection pour assurer la scurit Chapitre 42: Protection contre Einflsse
6、les effets thermiques Elektrische Anlagen von Gebuden Teil 4: Schutzmassnahmen Kapitel 42: Schutz gegen thermische BODY OF HD The Harmonization Document consists of: - IEC 364-4-42. (1980) edition 1, , together with - the CENELEC common modifications prepared by CENELEC/TC 64, appended This Harmoniz
7、ation Document was approved by CENELEC on 13 April 1983. The English and French versions of this HD are provided by the text of the IEC publication and the German version is the official translation of the IEC text. All texts prepared by CENELEC exist in three official versions (English, French, and
8、 German). According to the CENELEC Internal Regulations the CENELEC member National Committees are bound: to announce the existence of this Harmonization Document at national levei - by or before 1986-01-01 to publish their new harmonized national standard by or before 1986-10-01 to withdraw all con
9、flicting national standards by or before 1987-10-01. Harmonized national standards are listed on the HD information sheet, which is available from the CENELEC National Committees or from the CENELEC General Secretariat. . The CENELEC National Committees are the national electrotechnical committees o
10、f Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Copyright reserved to all CENELEC members Copyright European Committee for Electrotechnical Standardization Provided by IHS under licen
11、se with CENELECLicensee=Deere - risk of burns ; - impairment of the safe function of installed equipment. - Note.- Protection against overcurrent is dealt with in HD 384-4-43. 422. Protection against fire 422.1 Electrical equipment shall not present a fire hazard to adjacent materials. Any relevant
12、erection instructions of the manufacturer shall be observed in (2) 1 1 addition to the requirements of this HD. 422.2 Where fined equipment may attain surlPaLce temperatures which could cause a fire hazard to adjacent materials, the equipment shall either: - be mounted on or within materials which w
13、ill withstand such temperatures and are of low thermal conductance, or - be screened from elements of building construction by materials which will withstand such temperatures and are of low thermal conductance, o r - be mounted to allow safe dissipation of heat at asufficient distance from any mate
14、rial on which such temperatures could have deleterious thermal effects, any means of support being of low thermal conductance. 422.3 Where arcs or sparks may be emitted by permanently connected equipment in normal service, the equipment shall either: - be totally enclosed in arc-resistant material,
15、o r - be screened by arc-resistant material from building elements on which the arcs could have deleterious thermal effects, or Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECLicensee=Deere of a fire. 422.6 The materials of enclosures arra
16、nged around electrical eqcipment during erection shall withstand the highest temperature likely to be produced by the electrical equipment. Combustible materials are not suitable f o r the construction of these enclo- sures unless preventive measures against igxition are taken, such as covering with
17、 non-combustible or difficultly combustible material of low thermal conductivity. 423 Protection agai.nst burns Accessible parts o f . electrical equipment within arms reach shall cot attain a temperature likely to cause burns to persons, and shall com3ly with the appropriate limit stated in Table 4
18、2 A. A11 parts of the installation likely in normal service to attain, even for short periods, temperatures exceeding the limits stated in Table 42 A shall be guarded so as to prevent any accidental contact. However, the values in Table 42 A do not apply to equipment complying with temperature limit
19、s for exposed surfaces for safety from burns where such 1. - Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECLicensee=Deere & Co Categories/9999663103, User=Zhang, Kai Not for Resale, 08/08/2007 20:23:47 MDTNo reproduction or networking per
20、mitted without license from IHS -,-,- (5) : - 6 - limits are stated in the WN or HD CENELEC for the type of equipment for the type of equipment concerned, o r in the absence of EN o r HDs, in the corresponding National Standards. TABLE 42 A Temperature limits in normal service for accessible parts o
21、f equipment within arms reach I I Ikimum temperatures 1 ( o c ) I I I I 1 I I I Accessible parts .I I Hand-held means 1 Metallic 1 of operation . j Non-metallic I Parts intended to be touched but not hand- I Non-metallic I held I Parts which need not, I Materials of acces- 1 sibe surfaces 55 I 65 70
22、 I 80 I 80 90 I Metallic 1 I I. _ I I Metallic be touched for normal Non-metallic I - .- 424. Protection against overheatinq 424.1 Forced air heating systems 424.1.1 Forced air heating systems shall be such that their heating elements, other than those of central-storage heaters, cannot be activated
23、 until the prescribed air flow has been established and are deactivated when the air flow is reduced or stopped. In addition, they shall have two temperature limiting devices independent of each other which-prevent permissible temperatures from being exceeded in air ducts. 424.1.2 The frame and encl
24、osure of heating elements shall be of non-combustible material. 424.2 Appliances producing hot water or steam All appliances producing hot water o r steam shall be protected by design o r erection againt overheating in all service conditions. Unless the appliances comply as a whole with an appropria
25、te EN or HD CENELEC the protection shall be by means of an appropriate non-self-resetting device, functioning independently of the thermostat. I .6 I If an appliance has no free outlet, it shall also be provided with a device which limits the water pressure. Copyright European Committee for Electrot
26、echnical Standardization Provided by IHS under license with CENELECLicensee=Deere & Co Categories/9999663103, User=Zhang, Kai Not for Resale, 08/08/2007 20:23:47 MDTNo reproduction or networking permitted without license from IHS -,-,- - 7 - A P P E N D I X A CENELEC COMMON MODIFICATIONS (1 1 421 Th
27、e word “ignition is added in order t o have more complete wording. (2) 422.1 Necessary t o refer t o CENELEC Documents. (3) 423.3 Sparks may have different effects from those produced by arcs. (4) 422.5 Wording more .clear I Note 2 (5) 423 It is necessary t o provide f o r cases where European Stana
28、rd or Harmonization Document does not exist. (6) 424.2 Necessary t o refer t o CENELEC Documents. Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECLicensee=Deere & Co Categories/9999663103, User=Zhang, Kai Not for Resale, 08/08/2007 20:23:47 MDTNo reproduction or networking permitted without license from IHS -,-,-