3.2 Requirements According to Nuclear Regulations 3

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PROCEDURE AND REQUIREMENTS FOR INSTALLATION OF ELECTRICAL EQUIPMENT

Heading Designation

Cable Routes and Electromechanical Material MBE 201

version

Contents

1 GENERAL...... 2 1.1 Scope...... 2 1.2 Prerequisites...... 2 2 DEFINITIONS...... 2 3 INSTALLATION REQUIREMENTS...... 3 3.1 General...... 3 3.2 Requirements according to Nuclear Regulations...... 3 3.3 Standardisation...... 3 3.4 Electrically Related Requirements...... 3 3.5 Mechanically Related Requirements...... 4 4 INSTALLATION...... 4 4.1 General...... 4 4.2 Separation...... 4 4.3 Protection Class...... 5 4.4 Installation of Enclosures...... 5 4.5 Ladders and Ducts...... 5 4.6 Secondary Cable Routes...... 6 4.7 Protection during Installation...... 7 4.8 Marking...... 7 4.9 Welding...... 7 4.10 Touch up Painting...... 7

Designation Version Date Replaces

MBE 201 3 en 2003-10-28 2 en

04 年 6 月 2 日 (02b80c89eb79e5eadb4c8062e40ac94c.doc) MBE 201 Version 3 en Page. 2 (7)

1 GENERAL

1.1 Scope MBE 201 covers to electrical installation fastenings, i.e. all mechanical work associated with electrical installation work. This entails rules for how electrical enclosures and cable routes should be installed, various mountings and supports have to be constructed at the same time as separation and seismic requirements have to be considered.

1.2 Prerequisites Design documentation, which specifies requirements for electrical function class, seismic requirements, electrical interference and subs, and whether the area is a non- hazardous or hazardous area, shall be available when cable routes and installation fastenings are planned. The risk of any adverse influence on and from existing installations must also be identified.

2 DEFINITIONS

Main Cable Routes Cable routes which are documented on cable route drawings are normally included in a system of node points for a cable routing system and then consist of cable ladders and ducts.

Secondary Cable Routes Cable routes outside the main cable routes, frequently the last part of the route to a component.

Enclosure A collective term for cabinets, desks, boxes, junction boxes for various objects, 41-box and similar devices which contain electrical junction points.

3 INSTALLATION REQUIREMENTS

3.1 General The demands for electrical installation fastenings can be described as being requirements, which are based on electrical requirements, requirements related to electrical component so they will work as intend, and OKG/FKA requirements for mechanical installations. If a standard range of cable routing material is used, the supplier’s installation instructions for the products must be observed.

3.2 Requirements according to Nuclear Regulations Special requirements apply to safety classified components, as regards separation, environment and seismic.

3.3 Standardisation There is no Swedish standard for cable routing, but sections of Swedish Standard SS 424 14 38 for installation of cables in buildings, the General Material and Work Descriptions for Electrical Work (EL AMA 83), Section J and the OKG/FKA requirements for mechanical installations and surface treatment are applied where relevant.

3.4 Electrically Related Requirements The following electrical related requirements should be considered when installation is planned and when installation instructions (MI) are produced  Cable routes for classes 3-5 shall be specially designed to avoid interference caused by electrical and magnetic fields.  The construction of shielding, using various kinds of sheet metal enclosures forms an important part of the protection from external sources or to prevent internally generated interference from being emitted and interfering with other equipment.  Cable routes shall be constructed so that they are suited to the cable as regards bending radii, attachment facilities and flexibility.  Sharp edges in the cable route, which could damage the cable, must not occur  Mechanical protections shall be provided.  The cable route shall be functional and shall be suited to the needs, and shall comply with requirements based on the need to have equipment easily accessible for inspection, manoeuvring, modifications and similar for operation and maintenance.  Cable routes for installation and power cables shall be constructed so that the cables can be installed without impairing cooling.  Requirement for enclosure protection classes in various environments.  Other requirements which are based on the various needs of the installation

3.5 Mechanically Related Requirements The following mechanically related requirements should be considered in installation preparation and when Installation instructions (MI) are produced.  Equipment shall be dimensioned to withstand the forces to which it will be exposed, both static and dynamic.  As far as possible, the installation shall be built from standard components, which are assembled to form a functional unit.  Choice of material depends on the environment.  Surface treatment depends on the environment.

4 INSTALLATION

4.1 General Installation material with the same use shall be of a uniform type and of uniform grade. There are requirements for minimum bending radii in MBE MI 3003. The cable route shall be chosen accordingly. When cable routes and enclosures are installed, consideration shall be given to process pipes, insulation and ventilation ducts. Please refer to MBE MI 2009 and 2010. When installed against a concrete surface with expanding fasteners, an attempt should be made to achieve good mating against the substrate. If this is not possible because of unevenness or bulges, spacer washers may be used, but not exceeding 10 mm. Only cutting with a hole punch or sheet metal shears is permitted beside cables or other electrical equipment. Sharp edges beside cable transitions shall be provided with edge protection strips. Screws and nuts in the reactor hall shall be locked with Loctite or similar thread locking fluids. Crossings between cable routes for classes 1, 2 and classes 3, 4 shall be at right angles if possible. Please refer to the example in MBE MI 2008. Cables must be protected when cables pass through joists and to a height of at least 1 m above floor level. Protection must also be constructed for enclosures and cable routes if there is a risk of falling objects and fouling, if there is a risk of people treading on cables, crushing etc. in conjunction with maintenance, and in lift shafts if there is a risk that the load could be unbalanced or hook up. Please refer to MBE MI 2012 and 2013. When installation of switchgears, relay cabinets etc, special instructions will have to be prepared in each case.

4.2 Separation Cable routes must be built and enclosures must be mounted in accordance with the standard or in accordance with a special analysis, to conform to the requirement for independence. Please refer to MBE 101 chapter 5, in MBE MI 2000 examples of application of the standard.

4.3 Protection Class Unless other requirements are required of equipment to be located in electrical equipment room and other areas, installations must be such that at least protection class IP21 is maintained. Unless other requirements are stated, equipment located in areas within the boundary of severity B and C environment shall be installed in such way that at least protection class IP54 is maintained. To avoid condensation, enclosure must be provided with ventilators and if there is risk that water could find its way in, drain holes must be drilled at the lowest point. Enclosures, which are flat underneath, should be installed with a slight slope towards the drain hole to facilitate drainage. In the reactor containment and other hot and damp areas, where connections are made with various kinds of joints, with shrink tubing, Grayboot or other types of connectors, the enclosure mainly provides a mechanical and electrical interference shield over the junction, providing separation and protection against fouling. Enclosures for such applications should basically be at least IP54, but supplemented so that they are well ventilated and drained. It shall be possible for water and moisture to drain away and pressure equalisation shall be provided since quick changes in atmospheric pressure can take place within the enclosures. NOTE No holes for pressure relief or drainage may be made in qualified and approved sealed enclosures. Glands etc. for incoming cables shall be in accordance with MBE 400.

4.4 Installation of Enclosures Instructions for installation of enclosures are found in MBE MI 2100 Enclosures shall be located free and easily accessible, and with consideration given to separation, and shall be adapted to suit connecting cable routes. Enclosures shall be installed on steel profiles, assembly brackets or anchor rails, at a minimum distance of 20 mm from the wall. Installation height, highest access height etc shall be in accordance with MBE MI 2103. If possible, enclosures shall be installed with cable glands underneath or on the side. If this is not possible, space shall be made in areas within the boundary of severity B and C to provide the cables with so-called swan necks. Please refer to MBE 401. Larger floor-mounted enclosures, cabinets, shall be placed in accordance with the location drawing and shall be mounted in accordance with the manufacturer’s instructions unless otherwise specified.

4.5 Ladders and Ducts Instructions for installing ladders and ducts are found in MBE MI 2100. The centreline distance for cable route mountings is noted in MBE MI 2101 etc. Anchor rails shall generally be used for mounting brackets for ladders and ducts. Exceptions are allowed when one or two ladders run parallel and they can be attached directly to the wall.

Installation shall be adjusted so that the cable really ends up resting on the ladder/duct for its entire length. Installation shall be adjusted so that the cable can be installed without having to be threaded. No sharp edges, which could damage the cable, may occur along the cable route. Ducts shall be installed so that the sides and bases form complete surfaces without breaks, i.e. joints and junctions must be made without gaps and with good mechanical and electrical contact. The duct shall be installed in the same way as for connection to enclosures. Please refer to MBE MI 2217 Lids on ducts shall then be adjusted so that they form whole surfaces without breaks, and are securely tensioned with a strap. Cable ducts, which are installed vertically, shall be provided with tie wrap anchorage. Please refer to MBE MI 2204. It may be necessary to supplement drain holes made at the factory to prevent water from collecting in the duct. Passages at wall transitions are covered in MBE MI 2206.

4.6 Secondary Cable Routes Instructions for installing secondary cable routes are found in MBE MI 2300. Cables installed outside main cable routes must be installed with consideration given to the rules for separation. Cable routes for cables in classes 3 and 4 with requirements for shielding from interference shall be made of galvanised steel tubing, cable ducts with lids, or armoured cable must be used. This shall be physically unbroken from the duct to the connected component. Joints must have good mechanical and electrical contact. Please refer to MBE MI 2303 and 2304 Specially metal-sheathed cable can be used as an alternative to running cables in galvanised steel tubing. Cable routes should be laid out by the responsible designer and installation planner in consultation in process areas with much equipment in relation to available space, to ensure that consideration has been given to all conceivable aspects. The cable routes should then be documented on drawings. Transitions without supports for cables from a ladder or duct to a secondary route or component must not exceed 300 mm. Flat bar may be used as cable routes for a small number of cables between cable ladders or cable ducts and to a component or group of components. The same flat bar can support several cables, depending on the diameter of the cables and the width of the flat bar. The diameter of the bunch of cables should not exceed twice the width of the flat bar. Please refer to MBE MI 2305, 3108 1(2) and 3108 2(2). An alternative to straps is cable anchorages acc. to MBE MI 2306. These are mainly intended for bunches of cables with cable areas exceeding 4 mm². Secondary cable routes class 2, < 95 mm², can be arranged in one of the following ways

 on angle bar, channel bar or flat bars, for one layer  with steel tubes  As one layer beneath wall clamps. In vertical installation, cables may lie in two layers when fastened with cable clamps and a packing between the cables. Secondary cable routes for power cables, class 2 ³95 mm², shall be constructed with separate cable ladders for installation in one layer. Cable routes for classes 3 and 4 can consist of a cable duct when a large number of cables are to be installed along the same route. In other cases, the cable route shall consist of pipe, strap, or clamping directly on the substrate when interference requirements permit it.

4.7 Protection during Installation Ladders and cable ducts shall be provided with lids, as protection while installation is in progress, in places where there is a risk of fouling or damage. Please refer to MBE MI 2013.

4.8 Marking Cable routes shall be marked. Marking shall specify the sub, class and node points according to MI 2205. Suitable points for marking are at end points in wall transitions, crossing points and along the cable route at even intervals so that the cable route can easily be identified along its entire length. Marking shall be performed with paint approved by responsible department in the plant or engraved labels. Minimum text height shall be 25 mm.

4.9 Welding Welding requirements shall be noted in the drawing, with associated inspection plan.

4.10 Touch up Painting Touch up painting to be done in accordance with the requirements stated in TBY (Teniska Bestämmelser för Ytskydd) Cut, hot dip galvanised components with material thickness £ 1, 5 mm do not need to be touched up.

04 年 6 月 2 日 (02b80c89eb79e5eadb4c8062e40ac94c.doc)