St Mary Redcliffe Project 450 RIBA 2 Stage End Report

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Flexible conduits will be used for the final connection from a rigid conduit installation, to the terminal boxes of all equipment provided with a means of positional adjustment and/or where vibration may reasonably be expected to occur. All metalwork, cable trays, cable ladders, cable trunking and equipment will be equipotentially bonded. The cable trays, cable ladders and cable trunking will be jointed in a manner so that electrical continuity is maintained, (copper bonding links or earth straps are the preferred method) and connected to the earthing system. Earthing 10.1.11.1 Main External Earthing The proposed main earthing design will provide an earthing installation that considers all safety potentials (Step and Touch), Earth potential rise, and site classification (Cold OR Hot Site). The final design will limit all step and touch potentials to a suitable level. The design will include for an entire earthing system including (but not limited to) the following:- • All accessible exposed metal parts containing or supporting HV conductors; • Metallic substation enclosures of all high voltage and low voltage equipment; • Cable sheaths/screens/armouring; • Exposed metal of all floor reinforcing; • Transformer LV neutrals • Earth bars • Equipotential bonding The It is envisaged that the Distribution Network Operator (DNO) will provide earthing system and earth termination point by the cut-out. The Works will be solidly earthed by means of an integrated earthing system compatible with the DNO earthing systems, and in compliance with the DNO requirements. All extraneous conductive parts such as structural steelwork, cable support steelwork, steel tanks and piping, compound and site perimeter fences and gates, will be effectively bonded to the earthing system. When connecting differing materials together the required material transition plates must, in general, be inserted, in order to ensure that electrolytic action is avoided. All connecting materials must be corrosion proof and suitable for the conditions prevailing at the installation point. The design of the Site earthing grid will be developed as part of the Site-wide earthing strategy and will meet / surpass the technical requirements of the DNO. 10.1.11.2 Internal Earthing and Bonding The Earthing system will be installed in accordance with the local mandatory requirements. The point of connection and characteristics of the site electrical distribution will be established with the DNO. A copper earth bar will be provided within the main LV plant room. The earth bar will be wall mounted using insulation type mountings. Earth bars will be arranged with a spare capacity of 50% to allow for connection of future equipment at a later date. A clean earth bar will be provided within the communications room to reduce any interference caused by the low voltage distribution and a clean reference point for sensitive communications equipment. The earth bar will have removable test links to allow for testing without interference with Earthing conductor connections. Sub-main and final circuit cables will use circuit protective conductors to distribute earth connections throughout the installation. High-integrity earthing will be provided where appropriate within the installation. Equipotential bonding will be provided where required. Cabling associated with the earthing installation will generally be single core LS0H cables installed on cable trays/Ladder. Cables used for the safety earthing installation will have a green yellow oversheath. Cables for clean earth will have a cream LS0H oversheath. Lightning protection The lightning protection system will be provided to reliably, safely and substantially reduce the risk of damage to property and people within the building and disruption to essential services in the event of a strike by lightning. This system will be designed in accordance with the local mandatory standards. To ensure that the system is effective, the detailed design, installation, testing and commissioning will be carried out by a single lightning protection system specialist. The system will be arranged to prevent fixed metallic components of the building including rainwater disposal systems, roof mounted equipment, chimneys etc. from defeating the function of the lightning protection system. Materials which are resistant to atmospheric corrosion will be specified and thus the risk of staining of the external fabric of the building will be minimised. The system will be arranged not to undermine the weather proofing and waterproofing of roofs nor any other part of a building’s fabric. The system will be designed such that it will utilise as much as the building fabric as possible and be interconnected into the main building earthing system. Transient over voltage protection devices will be installed on the main switchboard, panel boards and distribution boards feeding external services. The current incumbent specialist is Enlightened, Simon Marcus, 0117 9727123 10.1.12.1 Air Termination Network Otherwise known as lightning collectors. There are three acceptable methods of providing an air termination network: 1563.R1 – Stage 2 report Page 22 of 29
1563.R1 – Stage 2 report Page 23 of 29 • The grid method: A grid of copper tape across the surface of the roof. The spacing of the mesh should never be greater than 20 x 20 metres and on some buildings may have to be less depending on results of the initial risk assessment. • Air rods: Rods which protrude above the line of the roof • Catenary conductors: Conductors suspended above the roof 10.1.12.2 Down Conductors Protection should be provided to all cables which enter or leave a building including: • Electrical supplies • Data and communications cabling • Signal, control and alarm cabling • CCTV The down conductors conduct the current from the air terminals to the earth termination network. These can take the form of earth tape which will be visible down the side of the building or may utilise metallic building fabrics such as steel columns or rebar. The spacing between down conductors should never be greater than 20 metres and exact details will be established during the detail design stage. The path of the down conductor must be as direct and short as possible and it is not acceptable for the down conductors to loop. 10.1.12.3 Earth Termination Network The earth termination network carries the lightning current to earth. There are various acceptable earthing systems but the most common are: • Earth rods: A copper-bond rod driven into the ground. They will typically be located around 1 metre from the edge of the building. • Earth plates or mats: Used to obtain an effective earth in willow soil with underlying rocks. • Ring electrode: A ring earth electrode that is sited around the outside of the building can also be used to provide an earth where the soil is willow. The ring must be in contact with the soil for a minimum of 80% of its length. The ring should be buried at around 0.5 metres deep and be 1 metre from the edge of the building. Earth inspection pits should be provided to allow for periodic inspection of the earth termination network. These will typically have the appearance of small manholes. 10.1.12.4 Connection to Building Main Earth Bar The lightning protection system will be connected to the building main earth bar. The main earth bar will typically be found in the main switchroom for the building or at the point at which the electricity supply enters the building. 10.1.12.5 Surge Protection Devices Transient over voltages are short duration, high magnitude voltage peaks. There are many causes of these over voltages but lightning strike can be the most extreme and can cause damage to the cabling installation through flashover, potentially resulting in loss of life through fire and electric shock. Transient over voltages can also be the cause of data loss and reduced life span or outright failure of sensitive electronic equipment. Telecommunication A site wide communications system will be provided with connections in all areas. The main communication cabinet will be located in the Vestry back office and will be 42U high, 800mm wide by 1,000mm deep, with front and rear lockable doors and 19” rack mountings front and rear, and heavy duty lockable castors. At this stage it is envisaged that the structured cabling will be over CAT6a. Structured wiring outlet faceplates will be from the same manufacturer as the structured cabling, fitted with CAT6a RJ45 U/UTP shuttered outlets. Metalclad structured wiring outlets will be provided in areas such as plant rooms and external areas. Active switches will be provided in each patch cabinet to allow transfer of data to the main server cabinet. All equipment within the server cabinet will be provided by an ICT specialist appointed separately by the Client in accordance with the clients requirements e.g. speed, security, data transfer. All active equipment (Excluding active switches) will be provided by others e.g. telephones, computers, telephone exchange, server, routers, modems, wifi transmitters, software. The following data points will be required for this project. These are in addition to any other data requirements associated with the specified building services systems. E.g. BMS, control panels, security systems, etc. Dedicated telephone lines will be required for each individual security system, fire alarm and lift. Audio Video (AV) System Provision will be made for AV systems to be installed within the new and refurbished buildings as required. The AV system will generally include: • Display Lighting • Sound distribution system • Temporary control stage equipment stations • Cabling infrastructure • Power and Data connections for Flat Screen TV’s and projectors • Laptop connections will be provided to allow connection of laptops to the TV screen within the room. The complete AV system detailed requirements will be confirmed and specified by the Client.
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ST MARY REDCLIFFE PROJECT 450 RIBA
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CONTENTS 1.0 PROJECT TEAM 2.0 INTRO
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2.0 INTRODUCTION Funded jointly by
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Project 450 Board Review Instructio
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4.1 STRUCTURES Undertaken by Integr
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s dopted e, whilst A full CCTV surv
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3.2 Existing Trees There are a larg
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Stability can be provided by reinfo
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1563.R1 - Stage 2 report Page 5 of
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LEGEND 40-60 W/m 2 HEAT GAINS - NAT
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LEGEND 40-60 W/m 2 HEAT GAINS - NAT
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4.3 LANDSCAPE Introduction The purp
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Historical Context The southern chu
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Landscape Concept The diagram adjac
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Response to Site The ANGULAR framew
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Sketch Plan: North Churchyard 3 The
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Sketch Ideas Red cliff - continuati
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NORTH CHURCHYARD Simple high-qualit
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SOUTH CHURCHYARD Mown paths/ margin
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4.4 SCHEME UPDATES ARCHITECTURAL PR
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FFL 12.00 FFL 10.36 FFL 10.36 FFL 1
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FFL 12.00 FFL 10.36 FFL 10.36 FFL 1
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4.5 CURRENT PROPOSALS 11 13 3 9 10
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27 29 28 A Concept Image for the Ne
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31 32 The Chancel South Aisle & Pri
Page 52 and 53: 4.6 MATERIALITY The design team hav
Page 54 and 55: PROPOSED OPENING TO NORTH AISLE
Page 56 and 57: Former Opening to South Porch Stair
Page 58 and 59: 4.8 AREAS OF FURTHER INVESTIGATION
Page 60 and 61: 5.0 CONSULTATION In order to ensure
Page 62 and 63: 6.0 COST PLAN Throughout RIBA Stage
Page 64 and 65: 7.0 RISK REGISTER To ensure the eff
Page 66 and 67: SMR - PROJECT 450 - RISK REGISTER R
Page 68 and 69: 8.0 PROGRAMME The below-listed prog
Page 70 and 71: 10.0 APPENDICES Endnotes 1 Sampson,
Page 72 and 73: St Mary Redcliffe Appendix B BS 583
Page 74 and 75: 10.2 ECOLOGICAL ASSESSMENT Contents
Page 76 and 77: 2 Method 2.8 A list of other specie
Page 78 and 79: 3 Results with some parts ancient w
Page 80 and 81: Eurasian Badger Meles meles Mammals
Page 82 and 83: oost is defined as any structure or
Page 84 and 85: Appendix 2 Policy & Legal Considera
Page 86 and 87: A A A A A A A A A A A A A A A A A A
Page 88 and 89: 10.3 MEP STRATEGY 4 Site Infrastruc
Page 90 and 91: 5 Proposed infrastructure This opti
Page 92 and 93: 1563.R1 - Stage 2 report Page 12 of
Page 94 and 95: 9 Mechanical Services Strategy 9.1
Page 96 and 97: In some public areas low surface te
Page 98 and 99: Drainage is provided to the existin
Page 106: 35 HYB ASS'D ROU 1 x 75 35 Hyb AR T
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St Mary Redcliffe Project 450 RIBA 2 Stage End Report

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