Electrical Testing Company Pty Ltd / download at electricaltestingcompany.com.au / AS/NZS 3003:2011 Cardiac (Rev C)
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1 AS/NZS 3003:2011 Cardiac Protected Electrical Areas (shall comply with Section 2 and Section 4 of the standard) The following is a guide for electricians involved with electrical installations for patient areas in hospitals and medical facilities which are deemed to comply with AS/NZS 3003:2011 Cardiac Protected Electrical Areas. This guide in no way replaces the need to consult and understand the relevant standard and it is not endorsed or approved by any authority. This document has been produced by persons with relevant industry experience who have seen a need to give some basic advice and direction for electricians prior to them undertaking electrical installations in patient areas. This documents only high lights the areas of common mistakes or misinterpretation and provides an easy reference by category and relevant clause identification, it in no way replaces the need to consult and understand the whole standard. The relevant clause is listed first in the topic sentence, and the statements or sentences here are not necessarily a direct representation of the clause. Categories Final sub-circuits, (page 2) Socket outlets (GPOs), (page 3) Electrical areas, (page 7) RCDs, (page 8) Contractor, (page 12) Definitions, (page 13) Cleaners socket outlets, (page 14) Marking / Labelling, (page 15) Permanently wired equipment, (page 16) Earthing / EP bonding, (page 17) Alterations and additions, (page 23) Page 1 of 23
2 Final sub-circuits CL (final sub-circuits cardiac) Only supply one patient location / bed, not looped from patient to patient or to another room, therefore the ensuite cannot share the sub-circuit, it requires a separate sub-circuit. Cardiac protected room with 6 patient locations (no looping of final sub-circuits between patient locations or other rooms). Sub-circuit 1 (MCB in DB) Sub-circuit 2 (MCB in DB) Sub-circuit 3 (MCB in DB) Sub-circuit 4 (MCB in DB) Sub-circuit 5 (MCB in DB) Sub-circuit 6 (MCB in DB) Sub-circuit 7 (staff station) (MCB in DB) Sub-circuit 8 (staff station) (MCB in DB) Cardiac protection rules shall apply to all GPO s including the staff station. Cardiac protected rooms (x3) with one patient location and ensuite (entryways shown closed for clarity) RCD at each bedhead (typical) RCD in each ensuite (if GPO installed) Sub-circuit 1 Sub-circuit 2 Sub-circuit 3 (MCB in DB) (MCB in DB) (MCB in DB) Sub-circuit 4 Sub-circuit 5 Sub-circuit 6 (MCB in DB) (MCB in DB) (MCB in DB) Page 2 of 23
3 Socket outlets CL (socket outlets) IEC GPOs to be RCD protected. CL (socket outlets) 5m RULE GPOs within 5m of a cardiac protected area and are accessible without the use of a key or tool are to be RCD protected. (RCD shall be 10mA double pole). The 5m rule GPOs could be located in rooms or corridors opening directly off the classified cardiac protected area. (The process of accessing the 5m rule GPO through a second door other than a door opening directly off or associated with the classified cardiac protected area may exclude this GPO from the ruling). 5m RULE GPOs shall be RCD protected, 10mA double pole and bonded back to the corresponding EP junction. Cardiac area Cardiac area Cardiac area 5m rule boundary. (a taut 5m flexible lead is plugged into the suspected GPO and if the socket end passes into the entryway or doorway of the Cardiac protected area the GPO is then deemed to fall within the boundary). This GPO falls under the rule as the opening to the room is not provided with a door. This GPO is excluded from the rule as the room does not open directly off the Cardiac protected area (second doorway). Cardiac Protected area These GPOs fall under the rule as the rooms open directly off the cardiac protected area and the doors are not locked. This GPO is excluded from the rule as the door is locked with key or card access only. Page 3 of 23
4 Socket outlets (cont.) CL (socket outlets) GPOs backed up by a UPS system; require a UPS status indicator where there is continuous patient observation by medical staff. The status indicator must be connected to the UPS battery system to indicate loss of mains supply to the UPS. (labelled) UPS STATUS CL (socket outlets) GPOs not readily accessible require a separate readily accessible double pole isolation switch (height of switch no more than 2m from the ground, floor or platform). GPOs must be below 2m to be classed as readily accessible and not behind heavy equipment. The purpose of this is to provide easy isolation of the equipment by the staff in the area to enable resetting of RCDs should there be an equipment fault. Double pole isolators shall be independent of the equipment they are controlling, to allow for removal and service of equipment. Do not place isolation switches for GPOs in the same switch plate as light switches. GPO isolators shall be a minimum of 500mm away from any light switch if near the entrance to the room. Isolation switches must be double pole. Labelled accordingly. CL (socket outlets) Refer this clause for the definition of 'readily accessible'. Capable of being reached quickly and without climbing over or removing obstructions, mounting upon a chair, or using a movable ladder, and in any case not more than 2m above the ground, floor or platform. Page 4 of 23
5 Socket outlets (cont.) CL (b) (socket outlets cardiac) Cleaner GPO to be located within the patient area (the RCD may be located out of the patient area). Cardiac area Cardiac area Cardiac area A cleaners GPO must be located in the cardiac area. CL (socket outlets) Groups of socket outlets must have clear delineation (e.g. stainless steel medical panel with a combination of different GPO supplies, an engraved line between GPO services or clear separation for easy user understanding). Clear indication of separation. CL (socket outlets) GPOs in ceiling spaces or imaging control rooms to be protected if supplying medical electrical equipment used within the patient area (RCD shall be 10mA double pole). Page 5 of 23
6 Socket outlets (cont.) CL (socket outlets) Slave GPOs to be labelled as 'From RCD 1 etc. (letter height minimum 2.0mm high) GPOs shall be labelled to indicate their controlling RCD. The word FROM is mandatory. CL (socket outlets) GPOs outside the patient area to be protected if supplying medical electrical equipment in the patient area i.e. cath labs, MRI, imaging. (RCD shall be 10mA double pole) CL (socket outlets) socket outlets on RCD protected supplies shall be: - Fitted with one amber, yellow or orange indicator light to show when supply is available. - Marked RCD Protected. - The switch shall indicate when on, by a red marking or red indicator light (CL ). Red marking on switch Amber neon RCD Protected label CL (socket outlets) Colour coding of socket outlets as follows (for 10A, 15A and 20A): - Normal supply shall be white - Essential supply shall be red - UPS supply shall be dark blue Page 6 of 23
7 Electrical Areas CL (electrical areas) Nurse stations and beverage bays if in the cardiac protected area form part of the area (therefore cardiac protection rules apply). In general terms Cardiac protected electrical areas are bound by full height walls and doors only. (This would normally account for the whole room) Cardiac Protected area (includes the staff station) The following are not boundaries: Bed curtains Staff stations Partitions/dividers Benches/desks Moveable walls Screens Staff / Nurse station (cardiac protection rules shall apply to all GPOs) CL (electrical areas) Refer this clause for a list of locations required to be wired as cardiac protected electrical areas Cardiac catheter labs and control rooms, Cardiac ICU, CCU, NICU, Op theatres for cardiac and thoracic surgery. CL (electrical areas) Green area sign to be installed on a wall and be readily visible in the area, and at a height of 2m to the top of the sign. 2m to the top of the sign FFL Page 7 of 23
8 RCDs CL.2.6 (RCDs) Readily accessible and no more than 2m above floor. 2m max RCDs & GPOs classed as readily accessible are to be positioned no higher than 2m, and not obstructed. FFL CL.2.6 (RCDs) Not mounted under benches, in cupboards or behind heavy equipment. RCDs are to be above benches and desks for easy user access and control. Bench Not below. Page 8 of 23
9 RCDs (cont.) CL.2.6 (RCDs) Located 500mm from any light switch, if near the entrance to the room. RCDs must be positioned a minimum of 500mm from light switches, in any direction if near the entrance to the room. Minimum of 500mm CL (RCDs) Not required for GPOs mounted on a medical electrical system, for powering that system. CL (RCDs) Not required for GPOs above 2.3m and clearly intended for permanently mounted equipment or marked accordingly (d)(ii). (Do not use the patient circuits in this case). (Label) Only for use with permanently mounted equipment. For GPOs above 2.3m on the wall or ceiling and clearly intended for permanently mounted equipment. Not fed from patient GPO circuits used for medical electrical equipment. (Label) Not for use with medical electrical equipment. Page 9 of 23
10 RCDs (cont.) CL RCDs must be double pole (single pole switchboard busbar chassis RCDs do not comply). RCDs must isolate the neutral conductor as well as the active conductor. CL.2.8.4(a) (RCDs) Supply no more than 12 points (GPOs and hard wired equipment). CL.2.8.4(b) (RCDs) Shall not supply points in different rooms. CL (RCDs) Labelled with SW/BD and MCB reference (letter height, minimum 1.5mm high), and RCD number i.e. 'RCD 1 etc. (letter height, minimum 2.0mm high). RCD number label SW/BD MCB label Page 10 of 23
11 RCDs (cont.) CL (RCDs) 10mA RCDs shall not be backed up by 30mA RCDs. Ensure 30mA RCDs do not back up RCDs used in areas classified as Cardiac protected electrical areas. Ensure your switchboard builder (if applicable) does not load the busbar chassis with 30mA RCDs for classified areas under this standard. CL.4.3 RCDs shall not control more than one patient location (cardiac). Refer diagrams on page 2. Page 11 of 23
12 Contractor CL.2.13 Will provide a written statement of compliance which shall be kept with the commissioning documents. The statement shall be in accordance with Appendix F of AS/NZS 3003:2011. Date: / / Statement of Compliance AS/NZS 3003: 2011 I, the licensed electrical installation worker, who carried out the electrical work associated with the: Cardiac protected electrical area Body protected electrical area Description of area and work: Located at facility: Certify that the work as described above has passed the required tests and complies in all respects, and in accordance with the current edition of AS/NZS For and on the behalf of company: Signature: Name: Electrical licence number: Date completed: / / Date certified: / / Page 12 of 23
13 Definitions CL Applied part, Type B. - Type B (non-isolated, equipment has a protective earth terminal) CL Medical electrical equipment AS/NZS AS/NZS 3200 defines medical electrical equipment with conductive applied parts i.e. electrical connections to the patient, into the following classes: - Type B (non-isolated, equipment has a protective earth terminal) - Type BF (floating, equipment is separated from earth) - Type CF (floating, equipment is separated from earth) CL Definition for 'readily accessible': capable of being reached quickly and without climbing over or removing obstructions, mounting upon a chair, or using a movable ladder, and in any case not more than 2m above the ground, floor or platform. Page 13 of 23
14 Cleaners socket outlets CL (cleaner GPO) Shall not be supplied from any final sub-circuit supplying other sockets in the area. CL (cleaner GPO) Colour beige, marked 'Cleaning Purposes Only' (letter height minimum 5.0mm high). CL (cleaner GPO) Cardiac area - one placed within the area (refer drawing page 5). CL (cleaner GPO) Shall be RCD protected, this RCD shall only protect these sockets. CL (cleaner RCD) Must be 10mA and double pole. (Good practise is to install these RCDs within the switchboard area/cupboard for easy reset by hospital staff, note - single pole switchboard busbar chassis RCDs do not comply). All RCDs associated with this standard shall be double pole, including cleaners RCDs, which shall also be 10mA. Ensure your switchboard builder (if applicable) supplies you with double pole RCDs. Page 14 of 23
15 Marking / Labelling CL (b) (labels) DB/CB identification labels for RCDs shall be not less than 1.5mm for the lettering height. CL (c) (labels) RCD identification for RCDs shall not be less than 2.0mm for the lettering height. CL (i) (labels) portable adhesive tape labels (Brother type) shall include a clear top laminate overlay in order to protect the printed lettering (tape labels without the laminate overlay are not acceptable). RCD ID minimum 2mm letter height. Tape labels must have a clear top laminate overlay. DB/CB ID minimum 1.5mm letter height. Page 15 of 23
16 Permanently wired equipment CL Equipment with Type B applied parts shall be RCD protected. CL If an RCD is connected to permanently wired equipment only, a white round earth pin GPO shall be provided to enable testing of the RCD, and labelled 'Test Only'. The RCD shall be labelled to identify the equipment it controls. (labelled) TEST ONLY Page 16 of 23
17 Earthing / EP bonding (It should be noted that a full understanding of this section is only possible by consulting and reading the AS/NZS standard, section 4.4) CL (cardiac bonding) The minimum size of any EP bonding conductor shall be 4mm2 (based on experience to achieve the 0.1 ohm or less requirement, the minimum size earthing conductor should be no less than 6mm2 for a cable run up to 25m in length. Conductor size of 4mm2 should be avoided). Ensure that your medical service panel (MSP) provider does not use 2.5mm2 cable for looping GPO earth terminals. CL (cardiac bonding) A cardiac protected electrical area shall only contain one EP earthing system but may serve more than one patient location in that area. A cardiac protected electrical area shall only contain one EP earthing system. Cardiac Protected electrical area (6 patient locations and includes the staff station) 1 EPJ only 1 earth system Shall only be provided with one EP junction (EPJ). The EPJ may be positioned to facilitate cabling requirements. CL (cardiac bonding) The EP earthing system shall only be provided with one EP junction. (Multiple cardiac protected electrical areas and their associated EP junctions shall be individually connected back to their controlling switch boards). SW/BD-A Earth Bar SW/BD-B EPJ EPJ EPJ Earth Bar Cardiac Cardiac Cardiac Three separate cardiac areas each with their own EP earthing system and EP junction. Page 17 of 23
18 Earthing / EP bonding (cont.) CL (cardiac bonding) A node system may be used in a large cardiac area with many patient locations (each node shall be connected directly to the EP junction). CL (a) (cardiac bonding) Each node is to be connected directly to the EPJ by insulated conductors with a maximum resistance of 0.01 ohms. (based on experience to achieve the 0.01 ohm or less requirement, the minimum size earthing conductor should be no less than 70mm2 for a cable run up to approximately 35m in length). Cardiac Protected electrical area with many patient locations and a EPJ staff station. A cardiac protected electrical area shall only contain one EP earthing system. Node Node Shall only be provided with one EP junction (EPJ) but may incorporate a node system to facilitate cabling. Each node shall be connected directly to the EP junction (recommended cable size 70mm2). Node Cardiac Node CL (cardiac bonding) Socket outlets that are accessible anywhere in the cardiac protected electrical area without using a tool are required to be bonded to the EP junction. It is not limited to those that are defined as readily accessible (therefore those sockets above 2.3m still need to be bonded back to the EPJ). CL m RULE socket outlet earth terminals including those socket outlets that are located within 5m of the entrance to the cardiac area shall be connected to the EP junction. (refer page 3 drawing) The 5m rule GPOs could be located in rooms or corridors opening directly off the classified cardiac protected area. (The process of accessing the 5m rule GPO through a second door other than a door associated with the classified cardiac protected area may exclude this GPO from the ruling). CL (cardiac bonding) Socket outlets installed outside the cardiac area but are used to supply medical electrical equipment in the area shall be connected to the EP junction, e.g. imaging areas. CL (cardiac bonding) Socket outlets include industrial style e.g. IP56 single and three phase outlets. CL (cardiac bonding) Generally, socket outlets for the connection of clocks are not required to be earthed back to the EP junction. Page 18 of 23
19 Earthing / EP bonding (cont.) CL (cardiac bonding) Socket outlet protective earthing conductors shall be insulated from other conductive items except at the EP junction. The resistance between the socket earth pin and the EPJ shall not exceed 0.1 ohm. CL (cardiac bonding) The protective earth terminal of permanently installed equipment shall be earthed to the EPJ. CL (cardiac bonding) Permanently installed non electrical conductive equipment and fittings that contact structural metal shall be connected to the EPJ via individual earthing conductors having a resistance not exceeding 0.1 ohms. Gas outlet reticulated pipelines may be earthed via pipe cable clamps or a braised copper strap with a cable lug connection. Water reticulated pipelines may be earthed via pipe cable clamps. Window frames may be earthed via the fixed metal frame that contacts the structural metal. Air conditioning grills may be earthed via the fixed metal frame that contacts the structural metal. Monitor brackets, hand and equipment rails etc. may be earthed via the metal wall frame that contacts structural metal. CL (cardiac bonding) All joints and connections to the EP earthing system shall be fully insulated or isolated from contact with structural metal (except at the EP junction, the EPJ may contact structural metal). CL (cardiac bonding) Cables forming part of the EP earthing system shall be joined in 2 screw tunnel terminals (this does not include single screw tunnels for socket outlets, however 2 or more conductors cannot be joined in GPO single screw terminals). GPO (rear view) 2 screw connector for EP earth cables EP earth cables from EP junction Sub-circuit earths in 2 screw connector Page 19 of 23
20 Earthing / EP bonding (cont.) CL (cardiac bonding) The EPJ shall be connected by return earths to each switchboard associated with the cardiac area from which the circuits originate i.e. One supply e.g. non-essential, 1 return earth. Two supplies e.g. non-essential and essential, 2 return earths (one to each switch board). Three supplies e.g. non-essential, essential and UPS, 3 return earths (one to each switchboard). The size of these return earths shall comply with AS/NZS Multiple cardiac protected electrical areas and their associated EP junctions, individually connected back to their controlling switch boards. Page 20 of 23
21 Earthing / EP bonding (cont.) CL (cardiac bonding) The EPJ if accessible within the area shall be marked EP Test Point 0.1ohm EP Earthing System EP Junction CL (cardiac bonding) If the EPJ is remote from the EP test point, the EP test point shall be marked EP Test Point 0.1ohm EP Earthing System (location of EP junction) Page 21 of 23
22 Page 22 of 23
23 Alterations, additions and repairs (shall comply with Section 6 of the standard) CL (alterations and additions) Any alteration or addition to an existing electrical installation shall be deemed to be a new installation and shall comply with the relevant provisions of AS/NZS 3003: This requirement applies to alterations and additions ranging from the install of new socket outlets to the installation or replacement of fixed electrical equipment such as dental chairs. CL (alterations and additions) Patient areas that are not already signposted as body-protected or cardiac protected electrical areas shall be upgraded to comply with AS/NZS 3003: 2011, prior to or during the alteration or addition to the electrical installation. Old signs indicating CLASS A or CLASS B areas are not body or cardiac protected areas. CL (alterations and additions) Alterations or additions to electrical installations in patient areas shall not proceed unless the patient area has been subject to routine testing within the previous 12 months. The green area sign shall have a current in-date sticker attached, if not the area needs to be retested prior to the works. CL (alterations and additions) If the installation of new socket outlets in a patient area increases the overall number by more than 10%, all socket outlets shall comply with the colour coding requirements of AS/NZS 3003: 2011, clause a) White normal supply b) Red essential supply c) Blue UPS CL (alterations and additions) IN CARDIAC Protected electrical areas the following requirements shall be applied prior to the alteration or addition: 1. Where the EP junction cannot be identified or is inaccessible for new connections, the entire EP earthing system shall be upgraded to comply with AS/NZS 3003: Where the EP junction or EP test point is not marked EP TEST POINT an EP test facility shall be installed to comply with clause If the EP test point is remote from the EP junction the linking cable shall be sized to ensure the resistance measurements comply with the standard. 4. New EP earthing connections shall comply with this standard when installing new electrical accessories, fixed equipment rated below 2.0kW, and non-electrical structural metal connected fittings. 5. The entire EP earthing system shall be upgraded to comply with this standard where fixed electrical equipment rated above 2.0kW is to be installed. CL. 6.3 (repairs) If the methods satisfy the fundamental safety principles of Part 1 AS/NZS 3000 the following work may be carried out to electrical installations with the original install method: Repairs to accessories (as defined in AS/NZS 3000) forming part of the existing electrical installation or replacement of such accessories with like-for-like components. Replacement of component parts of fixed equipment with like-for-like components. Replacement of a complete item of fixed electrical equipment in a patient area constitutes an alteration to the electrical installation and shall comply with clause 6.2. Page 23 of 23
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