BS_07671-2008_2011_cor._2013.pdf

BRITISH STANDARD BS 7671:2008 Requirements for Electrical Installations IET Wiring Regulations Seventeenth Edition ISBN-13:978-1-84919-730-4 BS 7671 Requirements for Electrical Installations takes account of the technical substance of agreements reached in the European Committee for Electrotechnical Standardization(CENELEC).HD 60364-7-710 Medical Locations was published by CENELEC in March 2012 and this corrigendum has been issued to technically align Section 710 of BS 7671:2008(2011)with HD 60364-7-710:2012.When undertaking the technical alignment process,the opportunity was taken to amend and restructure certain requirements,regulations and sentences to make it easier for the reader.The main technical changes are indicated with a bar to the right of the text.This document,Corrigendum June 2013,completely replaces Section 710 Medical Locations in BS 7671:2008(2011).Users may also wish to make the following consequential changes:Cover add“(Corrigendum June 2013)”Preface page 11,change“FprHD 60364-7-710 2010”to“HD 60364-7-710 2 12”0Appendix 1 page 278,delete“710.560.9.1(i)”in BS 5266 page 279,delete“710.560.11(vi)”in BS 5839 page 284,change“710.51.1”to“710.511.1”in BS EN 60439 page 290,change“FprHD 60364-7-710:2010”to“HD 60364-7-710:2 12”0Table of figures page 433,add“Fig 710.3 Typical medical IT system arrangement 237”Index page 455,add to Medical locations“-diagrams and documentation 710.514.9”+Amendment 1:2011(Corrigendum June 2013)The Institution of Engineering and Technology and BSI NO COPYING IN ANY FORM WITHOUT WRITTEN PERMISSION SECTION 710 MEDICAL LOCATIONS 710.1 Scope This section applies to electrical installations in medical locations to ensure the safety of patients and medical staff.These requirements,in the main,refer to hospitals,private clinics,medical and dental practices,healthcare centres and dedicated medical rooms in the workplace.The requirements of this section do not apply to medical electrical(ME)equipment.This section also applies to electrical installations in locations designed for medical research.NOTE 1 It may be necessary to modify the existing electrical installation,in accordance with this Standard,when a change of utilization of the location occurs.Special care should be taken where intracardiac procedures are performed in existing installations.NOTE 2 Where applicable,this Standard can also be used in veterinary clinics.NOTE 3 For ME equipment and ME systems,refer to the BS EN 60601 series.NOTE 4 Care should be taken so that other installations do not compromise the level of safety provided by installations meeting the requirements of this section.NOTE 5 Supporting information on the electrical installations of medical locations can be found in Health Technical Memorandum(HTM)06-01(Part A),published by the Department of Health.710.3 Assessment of general characteristics In order to determine the classification and Group number of a medical location,it is necessary that the relevant medical staff indicate which medical procedures will take place within the location.Based on the intended use,the appropriate classification for the location shall be determined.NOTE 1:Classification of a medical location is related to the type of contact between applied parts and the patient,the threat to the safety of the patient owing to a discontinuity(failure)of the electrical supply,as well as the purpose for which the location is used.(Guidance on the allocation of a Group number and classification of safety services for medical locations is shown in Annex A710.)NOTE 2:To ensure protection of patients from possible electrical hazards,additional protective measures are applied in medical locations.The type and description of these hazards can vary according to the treatment being administered.The purpose for which a location is to be used may justify areas with different classifications(Group 0,1 or 2)for different medical procedures.NOTE 3:Applied parts are defined by the particular standards for ME equipment.NOTE 4:Where a medical location may be used for different medical procedures the requirements of the higher Group classification should be applied;refer to Annex A710.710.31 Purpose,supplies and structure 710.312.2 Types of system earthing PEN conductors shall not be used in medical locations and medical buildings downstream of the main distribution board.NOTE:In Great Britain,Regulation 8(4)of the Electricity Safety,Quality and Continuity Regulations 2002 prohibits the use of PEN conductors in consumers installations.710.313 Supplies 710.313.1 General In medical locations,the distribution system shall be designed and installed to facilitate the automatic changeover from the main distribution network to the electrical safety source feeding essential loads,as required by Regulation 560.5.710.4 Protection for safety 710.41 Protection against electric shock 710.410.3 General requirements 710.410.3.5 The protective measures of obstacles and placing out of reach(Section 417)are not permi