AS/NZS 3003:1999

1 - AS/NZS 3003:1999 ELECTRICAL INSTALLATIONS - PATIENT TREATMENT AREAS OF HOSPITALS AND MEDICAL AND DENTAL PRACTICES
4 - PREFACE
6 - CONTENTS
8 - SECTION 1 SCOPE AND GENERAL
8 - 1.1 SCOPE
9 - 1.2 APPLICATION
9 - 1.3 REFERENCED DOCUMENTS
10 - 1.4 DEFINITIONS
10 - 1.4.1 Applied parts, Type CF, Type BF or Type B
10 - 1.4.2 Authorized person
10 - 1.4.3 Body-protected electrical area
10 - 1.4.4 Body-type procedure
11 - 1.4.5 Cardiac-protected electrical area
11 - 1.4.6 Cardiac-type procedure
11 - 1.4.7 Equipotential terminal (EP terminal)
11 - 1.4.8 Exposed metal
11 - 1.4.9 Leakage protected circuit (LPC)
11 - 1.4.10 Leakage protective device (LPD)
11 - 1.4.11 Line isolation monitor (LIM)
12 - 1.4.12 Medical electrical equipment
12 - 1.4.13 Overload monitor
12 - 1.4.14 Patient-circuit
12 - 1.4.15 Patient equipotential area (EP area)
13 - 1.4.16 Patient equipotential junction (EP junction)
13 - 1.4.17 Patient location
13 - 1.4.18 Prospective hazard current
13 - 1.4.19 Protected electrical area
13 - 1.4.20 Return earth
13 - 1.4.21 Transformer-isolated supply
13 - 1.5 METHOD OF MARKING
15 - SECTION 2 GUIDANCE
15 - 2.1 INTRODUCTION
15 - 2.2 AREA SELECTION
16 - 2.3 CLASSIFICATION SELECTION
17 - SECTION 3 BODY-PROTECTED ELECTRICAL AREAS
17 - 3.1 GENERAL
17 - 3.2 SUPPLY WIRING
17 - 3.2.1 Low voltage a.c. supplies (including emergency power supplies)
18 - 3.2.2 Low voltage d.c. supplies
18 - 3.2.3 Extra-low voltage supplies
18 - 3.3 EARTHING
18 - 3.4 ACCESS TO LEAKAGE PROTECTIVE DEVICES AND LINE ISOLATION MONITORS
18 - 3.5 SOCKET-OUTLETS
18 - 3.5.1 Number and disposition
18 - 3.5.1.1 General
18 - 3.5.1.2 Cleaning purposes
19 - 3.5.2 Marking and identication of socket-outlets
19 - 3.5.3 Type of socket-outlet
19 - 3.6 RESIDUAL CURRENT DEVICES (RCDs)
19 - 3.6.1 General
19 - 3.6.2 Number of poles
19 - 3.6.3 Discrimination
19 - 3.6.4 Number of points controlled by RCDs
20 - 3.6.5 Indication
20 - 3.6.6 Marking
20 - 3.6.7 Access for testing
20 - 3.7 LOW VOLTAGE ISOLATED SUPPLIES
20 - 3.7.1 General
20 - 3.7.2 Isolating transformer
20 - 3.7.3 Overload monitor
20 - 3.7.4 Line isolation monitor
21 - 3.7.5 Overcurrent circuit-breaker
21 - 3.7.6 System prospective hazard current
21 - 3.7.7 Number and disposition
21 - 3.7.8 Access for testing
21 - 3.8 ISOLATING SWITCHES
21 - 3.9 MARKING
21 - 3.10 COMMISSIONING
22 - SECTION 4 CARDIAC-PROTECTED ELECTRICAL AREAS
22 - 4.1 GENERAL
22 - 4.2 SUPPLY WIRING
22 - 4.2.1 Low voltage a.c. supplies (including emergency power supplies)
23 - 4.2.2 Low voltage d.c. supplies
23 - 4.2.3 Extra-low voltage supplies
24 - 4.3 EARTHING
24 - 4.3.1 General
24 - 4.3.2 Equipotential earthing system
30 - 4.3.3 Return earth
30 - 4.3.4 Patient equipotential terminal (EP terminal)
31 - 4.3.5 Earthing of permanently wired equipment
31 - 4.4 ACCESS TO LEAKAGE PROTECTIVE DEVICES AND LINE ISOLATION MONITORS
31 - 4.5 SOCKET-OUTLETS
31 - 4.5.1 Number and disposition
32 - 4.5.2 Marking and identication of socket-outlets
32 - 4.5.3 Type of socket-outlet
32 - 4.6 RESIDUAL CURRENT DEVICES (RCDs)
32 - 4.6.1 General
32 - 4.6.2 Number of poles
32 - 4.6.3 Discrimination
32 - 4.6.4 Number of points controlled by RCDs
33 - 4.6.5 Indication
33 - 4.6.6 Marking
33 - 4.6.7 Access for testing
33 - 4.7 ISOLATED SUPPLIES (OTHER THAN ELV)
33 - 4.7.1 General
33 - 4.7.2 Isolating transformer
33 - 4.7.3 Overload monitor
33 - 4.7.4 Line isolation monitor
33 - 4.7.5 Overcurrent circuit-breaker
34 - 4.7.6 System prospective hazard current
34 - 4.7.7 Number and disposition
34 - 4.7.8 Access for testing
34 - 4.8 ISOLATING SWITCHES
34 - 4.9 MARKING
34 - 4.10 COMMISSIONING
35 - APPENDIX A RATIONALE FOR THE REQUIREMENTS OF THIS STANDARD
35 - A1 DEFINITIONS
35 - A2 GUIDANCE
35 - A3 BODY-PROTECTED ELECTRICAL AREAS
35 - A3.1 General
35 - A3.2 Supply wiring
35 - A3.3 Earthing
35 - A3.4 Access to leakage protective devices and line isolation monitors
35 - A3.5 Socket-outlets
36 - A3.6 Residual current devices
36 - A3.7 Low voltage isolated supplies
36 - A3.8 Isolating switches
36 - A3.9 Marking
36 - A3.10 Commissioning
37 - A4 CARDIAC-PROTECTED ELECTRICAL AREAS
37 - A4.1 General
37 - A4.2 Supply wiring
37 - A4.3 Earthing
38 - A4.4 Access to leakage protective devices and the line isolation monitors
38 - A4.5 Socket-outlets
39 - A4.6 Residual current devices (RCDs)
39 - A4.7 Isolated supplies (other than ELV)
39 - A4.8 Isolating switches
39 - A4.9 Marking
39 - A4.10 Commissioning
40 - APPENDIX B PLANNING OF AREAS
40 - B1 RATIONALE FOR DECIDING WHAT AREAS SHOULD BE WIRED AS BODY-PROTECTED ELECTRICAL AREAS OR AS CARDIAC-PROTECTED ELECTRICAL AREAS
40 - B1.1 Types of medical procedures necessitating protection
40 - B1.2 Types of protection
41 - B2 RATIONALE FOR CHOOSING RCD-PROTECTED OR ISOLATION- PROTECTED SUPPLY SYSTEMS
41 - B2.1 General
41 - B2.2 Summary
41 - B3 RATIONALE FOR DECIDING THE NUMBER AND DISPOSITION OF FINAL SUBCIRCUITS IN THE AREA
41 - B3.1 Socket-outlets
42 - B3.2 Number of protective devices
43 - B4 TEMPORARY UPGRADING OF AREAS
44 - APPENDIX C MARKING OF BODY-PROTECTED ELECTRICAL AREAS AND CARDIAC-PROTECTED ELECTRICAL AREAS
44 - C1 BODY-PROTECTED ELECTRICAL AREA SIGNS
44 - C2 CARDIAC-PROTECTED ELECTRICAL AREA SIGNS
45 - APPENDIX D COMMISSIONING TESTS FOR BODY-PROTECTED ELECTRICAL AREAS AND CARDIAC-PROTECTED ELECTRICAL AREAS
45 - D1 GENERAL
45 - D2 FORMAT OF TEST REPORTS
45 - D3 EXAMPLE OF COMMISSIONING TEST REPORT
45 - D3.1 Body-protected electrical areas
51 - D3.2 Cardiac-protected electrical area
60 - D4 RCD COMMISSIONING TEST RESULTS
61 - D5 LIM COMMISSIONING TEST RESULTS
62 - APPENDIX E MEASURES FOR AVOIDING INTERFERENCE FROM MAGNETIC FIELDS
62 - E1 GENERAL
62 - E2 LOCATION OF EQUIPMENT
62 - E3 UNDERFLOOR HEATING
63 - APPENDIX F METHOD FOR MEASURING MAGNETIC FIELDS
65 - APPENDIX G INSTRUMENT FOR MEASURING POTENTIAL DIFFERENCES IN AN INSTALLATION
67 - APPENDIX H EARTHING OF PERMANENTLY WIRED ELECTRICAL EQUIPMENT IN EP AREAS
67 - H1 GENERAL
68 - H2 EQUIPMENT POWERED FROM DOUBLE-INSULATED ELV SUPPLIES
68 - H2.1 General
68 - H2.2 Interconnection of accessible conductive parts
68 - H2.3 Earthing
68 - H3 EQUIPMENT POWERED FROM SINGLE-INSULATED ELV SUPPLIES
69 - H4 EQUIPMENT POWERED FROM PROTECTED LV SUPPLIES
69 - H4.1 General
69 - H4.2 Interconnection of accessible conductive parts
69 - H4.3 Earthing
69 - H5 EQUIPMENT POWERED FROM UNPROTECTED LV SUPPLIES
69 - H5.1 General
69 - H5.2 Interconnection and earthing of accessible conductive parts
70 - APPENDIX I CALCULATIONS FOR EQUIPOTENTIAL EARTHING SYSTEMS
70 - I1 REQUIREMENTS OF THE STANDARD
70 - I2 EXAMPLES OF RESISTANCE CALCULATIONS
70 - I2.1 General
70 - I2.2 Equipotential earthing system
70 - I2.3 Connections to the EP junction
72 - APPENDIX J ADDITIONAL REQUIREMENTS FOR APPLICATION IN NEW ZEALAND
72 - JI SCOPE
72 - J2 DEFINITIONS
72 - J2.1 Exposed conductive part
72 - J2.2 Patient environment
73 - J3 EQUIPMENT USED OUTSIDE OPERATING THEATRES AND DEDICATED BODY-PROTECTED AREAS
73 - J4 GENERAL
73 - J5 PROVISION OF EP SYSTEM
73 - J6 FORM OF EP SYSTEM
73 - J7 TOUCH VOLTAGE
73 - J8 PIPELINE ISOLATORS
73 - J9 CONNECTION OF ITEMS TO THE EQUIPOTENTIAL EARTHING SYSTEM
73 - J9.1 Items to be connected to the equipotential earthing system (other than the EP junction)
73 - J9.2 Items to be connected to the EP junction
74 - J10 CONDUITS
74 - J11 EQUIPMENT EP TERMINALS

Specifies requirements in addition to those in the SAA Wiring Rules (AS 3000) for electrical installations in hospitals and medical and dental practices where electromedical procedures are performed on a regular basis. In addition, specifies requirements for cardiac-protected and body-protected electrical areas. Included in the appendices are typical forms for commissioning tests for patient treatment areas, methods of measuring magnetic fields and resistance calculations in equipotential areas.

This Standard sets out the requirements for electrical installations in those patient treatment areas of hospitals and other medical and dental practices in which the administration or practitioner has elected to-(a) use medical electrical equipment during cardiac procedures; or(b) use medical electrical equipment with Type B (unprotected) applied parts during body type procedures; or(c) use multiple pieces of medical equipment with Type BF applied parts during body type procedures.The requirements are applicable to the electrical installations and certain conductive items in those areas.This Standard sets out additional requirements for electrical installations in patient treatment areas in hospitals and other medical and dental practices in New Zealand (see Appendix J). Patient treatment areas other than body-protected electrical areas or cardiac-protected electrical areas are not covered by this Standard, but are covered by the relevant requirements of AS 3000.NOTES:1 Attention is drawn to AS/NZS 2500, which outlines the method of determining the classification of various procedures and recommends routine operational and maintenance procedures to ensure the safe use and interconnection of medical electrical equipment. That Standard also explains how several procedures commonly carried out in a general ward area are classified under certain conditions as cardiac-type procedures warranting extreme caution.2 A rationale for the requirements of this Standard is given in Appendix A.3 If a hospital or medical practice has elected to undertake cardiac-type procedures then appropriate cardiac-protected electrical areas need to be provided.4 The number and disposition of cardiac-protected electrical areas that should be provided will be dependent on the types of procedures that the hospital or medical practice has elected to undertake.5 Hospitals and medical practices that might not propose to undertake cardiac-type procedures may, in the case of emergency, temporarily upgrade an area in accordance with the recommendations and limitations identified in AS/NZS 2500, to provide temporary electrical protection.6 The increasing use and application of medical electrical equipment in medicine and the range of electrical protection provided by such equipment, ranging from no isolation to full isolation, makes it difficult to determine which patient treatment areas will require cardiac-type or body-type electrical protective measures in the electrical installation. It is therefore recommended that, during any electrical installation in patient treatment areas-(a) close attention be given to the relevant requirements herein (earthing, subcircuit layout and other factors) that will facilitate conversion of areas to either body-protected or cardiac-protected areas;(b) attention be given to the recommendations of AS/NZS 2500 listing the electrical supply and equipment protective measures appropriate for particular medical procedures; and(c) consideration be given to residual current device (RCD) protection of other patient treatment areas where equipment to be used will be likely to be subjected to spilling or splashing of liquids. Areas such as dialysis rooms should always be wired as body-protected electrical areas because of the presence and likely spillage of copious amounts of liquid.7 It is important for hospital managements and the electrical design engineers to evaluate jointly the elected procedures likely to be undertaken and to determine which areas of the installation should be wired as body-protected electrical areas or as cardiac-protected electrical areas.8 Requirements for mobile trolleys supporting electrical equipment are given in AS/NZS 3200.1.0 and AS/NZS 4510.9 Requirements for emergency lighting are given in AS/NZS 2293.10 Requirements for emergency power systems in hospitals are given in AS/NZS 3009.

First published as part of AS 3003-1976.
Second edition 1985.
Jointly revised and redesignated in part as AS/NZS 3003:1999.