MBE 501Version 3enSid. 1 (6)
PROCEDURE AND REQUIREMENTS FOR INSTALLATION OF ELECTRICAL EQUIPMENTHeading
Building Construction Section / Designation
MBE 501
Version
3en
Contents
1GENERAL
1.1Scope
1.2Prerequisites
2DEFINITIONS
3INSTALLATION REQUIREMENTS
3.1General
3.2Requirements from nuclear regulations
3.3Standardisation
3.4Requirements arising from type approval
4INSTALLATION
4.1Hole-punching in walls and framing of joists in concrete
4.2Expanding fasteners
4.3Sealing of wall and framing of joists
4.4Fire shields
1GENERAL
1.1Scope
MBE 501 covers building construction aspects, such as expanding fasteners, various types of seals in framing of joistsandwall bushing, and installation of fire shields.
1.2Prerequisites
1.2.1Expanding fasteners
Documents, which specify any seismic requirements and installation instructions, which specify the type and dimensions or specially prepared drawings. The maximum drilling depth shall be specified, plus opportunities for drilling through reinforcement bars. Sufficient concrete strength and thickness shall also be ensured.
1.2.2Sealing of wall entrance
Documentation, which specifies the requirements and the type of sealing method, casting compound or module seals, fire resistance classification, gas tightness or pressure tightness.
1.2.3Fire shields
Documents, which specify the location of fire shields between cable paths.
2DEFINITIONS
Expanding fasteners
Expanding screw, Self undercutting anchor and similar.
Fire shields
A shield made of fire resistant material, which is installed with a particular geometry between cable routes and prevents fire from spreading from one section of an installation (sub) to another one. The shield then forms a fire barrier between various safety classified and operationally classified sections.
Fire resistance classes
The following fire resistance class is used:
EI60 or EI120 were the designations stand for:
E=integrity.I= insulation.
The numbers gives the classified fire-resistance in minutes.
Gas-tight, wall transition for gas-tight cables
Module seals or special casting compounds which can withstand the stresses imposed by fire and still retain their sealing properties.
Pressure-tight, wall transition for pressure-tight cables
Transitions between primary and secondary areas in the reactor containment. This is made with double moduleseals with pipe connections, to permit sealing to be tested.
3INSTALLATION REQUIREMENTS
3.1General
3.1.1Expanding fasteners
Type approval shall be found for each type of expanding fastener, unless otherwise specified. The specified requirements must be complied with in order for type approval of a particular application to be valid.
3.1.2Sealing of walls and floor transitions
Type approval must have been granted for each type of seal, unless otherwise specified. The specified requirements must be complied with in order for type approval to be valid.
3.1.3Fire shields
The design of fire shield shall comply with the requirements made by the separation requirements. They shall also comply with the strength requirements for the various events, which might occur in case of fire. The need for fire shields will be finally determined when the cable has been installed in the cable run.
3.2Requirements from nuclear regulations
The requirements from the nuclear regulations relating to seals in wall and floor transitions are complied with by conforming to theSwedish Board of Building, Planning and Housing.
Fire shields shall be designed to conform to the requirements in IEEE 384.
3.3Standardisation
Expanding fasteners and fire seals shall be type approved by SITAC (Swedish Institute for Technical Approval in Construction) or ETA (European Technical Approval) for the application.
To use of expanding fastenersthere are alsorequirements specific to nuclear power stations
3.4Requirements arising from type approval
3.4.1Expanding fasteners
The manufacturer’s instructions for installation of expanding fasteners must be observed. This is a condition of validity of the type approval certificate. Please refer to MBE 102.
Products/types of expander exists, described in MI 5302 and MI 5303
The application shall be in the environment and safety classifications for which the expanding screw is approved in accordance with 1.2.1.
If side forces are applied, the installed component must mate up against the concrete surface.
Screws shall be tightened to the specified torque and checked with a torque wrench.
Marking shall be checked.
The specified amount of inspection shall be carried out.
Usage also assumes a minimum thickness and strength of concrete. Please refer to 1.2.1.
3.4.2Sealing of wall and floor Transitions
The manufacturer’s instructions for installation or application of seals must be observed. This is a condition of validity of the type approval certificate. Please refer to MBE 102.
The seals must be approved for the use and the performance requirements noted in 1.2.2.
Check that the correct products are used and that the workmanship and installation correspond to the associated documents.
4INSTALLATION
4.1Hole-punchingin walls and framing of joists in concrete
Drilling of holes is not allowed without approval from responsible constructorsapproving in prefabricated concrete structure and in special foundations as turbine, feed water pump and feed water tank footing, walls with carrying load and pressure and extension strain. General applies that all drilling in reactor inclusion for attachment will already in construction phaserefer toresponsible Structural engineerfor consideration.
Drilling will take place with drilling those diameters and drilling the depths as will be seen manufactures instructions
At all kind of drilling within checked area and clean roomwill local extraction always be use.
Drilling machines that are used will be provided with reliable distance stop.
The centre line of the holewill be deviate maximum 5°.
4.2Expanding fasteners
Expanding fasteners must be installed at right angles to the surface of the fastened object (nut surface).Please refer to MBE 102 for installation of expanding fasteners.
If there is any unevenness in the concrete, new spacer washers must be used, as specified in MBE 102.
4.3Sealing of wall and framing of joists
Mounting of wall entrance please refer to MBE 102
Cables to be sealed shall be separated and parallel. If there is a requirement for pressure tightness, the testing connection shall be installed.
In pressure-tight versions, the cables shall mate against the seal at a right angle.
The seal must not be loaded by an excessive number of cables etc if it is to meet the stated requirements.
4.4Fire shields
Fire shields are normally suspended from cable ladders/ducts or brackets. In a fire, the cable ladders and ducts will be deformed. To prevent the boards from cracking when the suspension devices are mounted on ladders, the suspension devices shall be made flexible. Please refer to MBE MI 5101.
The boards shall be installed overlapping and shall be fixed to the suspension devices by means of bolts, nuts and washers in accordance with MBE MI 5101.
If the shields are worked or cut, the paint must be touched up with a brush in accordance with the description provided by the paint manufacturer. Please refer to MBE 102.
The boards shall be installed at a slight angle, so that water runs off. The angle should be against the access passage, not against the wall. The angle should be about 5 % i.e. 5mm/100mm.
Holes, larger cracks etc. in fire shields should be preferably sealed by board material or sheet metal, which is screwed or riveted to the fire shield. Failing this, the sealant provided by the board supplier should be used. The largest crack size is 5 mm. Anchor rails shall also be sealed. Please refer to MBE MI 5119.
Pipes etc which could move relative to the fire shield because of temperature changes should have a sheet metal shield placed around the pipe. It should be possible for the pipe to move within the shield without forces being transmitted to the sleeve and the cast seal. Please refer to MBE MI 5202.
Hot dip galvanised pipes or steel spiral hoses can be used as fire shields for individual cables. Pipes and spiral hoses should have a wall thickness of at least 1 mm. The installation is to be done as for secondary cable routes. Please refer to MBE MI 2000.
Pipes or spiral hoses should be joined by means of suitable sleeves, to completely eliminate cracks and gaps in the joint.
When pipes or spiral hoses are connected to enclosures, boxes or other areas via fire seals, the pipe or spiral hose should be terminated in the fire seal, to completely eliminate gaps in the installation.
When pipes or spiral hoses containing cables for different subs are connected, where the separation distance of 25 mm can not be maintained, such as in cable trays beneath cabinets, the installation can be sprayed with fire protection paint approved by OKG/FKA.
2008-03-03 (Dokument i Windows Internet Explorer)