SPECIAL SPECIFICATION 8336 Electric Underground Vault

Transcription

1 2004 Specifications CSJ SPECIAL SPECIFICATION 8336 Electric Underground Vault 1. Description. This Item shall govern for the furnishing and construction of an Electric Underground Vault (EUV) as shown on the plans, as detailed in this Special Specification and as directed by the Engineer. This underground equipment shelter shall house the various surveillance, communications and control equipment required for the system as shown on the plan. Upon completion of the work, each EUV shall be properly tested. 2. Materials. A. General Requirements. 1. EUV. The equipment shelter shall be a steel reinforced, cast in place concrete equipment shelter. The equipment shelter shall meet the following codes and standards: Item 420, Concrete Structures, ACI Equipment Shelter Code Requirements for Reinforced Concrete. Equipment shelter exterior dimensions shall be a minimum as shown on the plans. a. The concrete shall meet the requirements as shown on the plans in accordance with Item 421, Hydraulic Cement Concrete. b. Reinforcing steel shall meet the requirements of ASTM A615, Grade 60 in accordance with Item 440, Reinforcing Steel. Bars with kinks or bends not indicated on drawings will not be used. Heating to facilitate bending of bars will not be permitted. c. The backfill material shall meet the requirements as shown on the plans on accordance with Item 400, Excavation and Backfill of Structures. d. The flowable backfill material shall meet the requirements as shown on the plans in accordance with Item 401, Flowable backfill. e. The following design criteria are used: DIVISION I. Class F Concrete - Minimum compressive strength 5000 psi. DIVISION II. Reinforcing Steel - ASTM A615, Grade 60. DIVISION III. Earth Cover - 4 ft. maximum. (The structure should be installed with a minimum of 2 ft.0 in. of earth cover over its top.) 2. Insulation and Waterproofing. All exterior surfaces of the EUV shall be protected by the use of a Waterproofing system in accordance with the Special Specification Waterproofing and as shown in the plans. All the joints shall be properly sealed in accordance with Item 438, Cleaning and Sealing Joints and Cracks

2 The entranceway needs to be insulated to seal the ECUV from wind driven rain or ground accumulated rain water. The equipment shelter shall be completely weatherproofed to prevent the entry of water, dust and dirt. 3. Metals. Metals used are resistant and/or protected against general corrosion, and should not produce any galvanic corrosion in conjunction with other metals likely to be present in the EUV. Plastic parts and assemblies are solvent and stress crack resistant and are compatible with metals and other materials used in the manufacture of the EUV. 4. Panels. Each equipment shelter shall be provided complete with all internal components, back and side panels, terminal strips, harnesses, and connectors as well as mounting hardware necessary to provide for installation of equipment as described herein and on the plans. All external screws, nuts and locking washers shall be stainless steel. No self-tapping screws shall be used unless specifically approved by the Engineer. All parts shall be made of corrosion resistant material, such as plastic, stainless steel, aluminum or brass. All materials used in construction shall be resistant to fungus growth and moisture deterioration. An inert dielectric material shall separate dissimilar metals. Roof, wall and floor panel connections shall have headed stud connections plates cast into the roof wall and floor panels and be welded together after panel alignment. 5. Grounding. The equipment shelter shall be grounded to vault reinforcing steel. Details of the equipment shelter design shall be submitted to the Engineer for review and approval prior to fabrication. The Contractor shall submit an equipment shelter layout for each equipment shelter location for approval by the Engineer. Only equipment shelters with an approved layout will be accepted under this project. The equipment shall be designed for ease of maintenance. All component parts shall be readily accessible for inspection and maintenance. 6. Ventilation. Ventilation air shall be introduced into the space by ceiling/surface mounted exhaust fan & outdoor air intake duct. The system shall have a gravity back draft damper on the gooseneck. The ventilation systems shall run continuously under any of the following conditions: EUV temperature rises above 80 F, and the outside temperature is less than 75 F. The blower deactivates when the EUV temperature drops to 75 F. EUV temperature exceeds 100 F. When the atmospheric monitor indicates an unsafe environment

3 7. Entranceway. The EUV shall have an above ground hatch entranceway and shall measure a minimum of 4 ft. X 6 ft., and meet the requirements of OSHA 2206, General Industry Standards, for personnel safety and for installation of frames and equipment of the EUV installation site. The EUV shall be accessed through a hinged hatch that is above ground on a ground level concrete slab. This concrete slab shall be cast in field after adjusting the frame and cover to the finish grade. The hinged hatch shall withstand a loading of 300 psf. The Fault light should be in immediate view upon opening the hatch. This light would indicate the suitability for human occupancy as measured by the atmospheric gas monitor and wall thermostat. The hatch shall be gasketed and designed to seal any seeping/leaking of water or rain. The hatch shall be equipped with a mechanism to hold it in its open position and it shall lock automatically when hatch is opened. To close the hatch it need be manually unlocked. The hatch door shall be locked with a key from outside. It should be capable of unlocking from inside if need be. The EUV collar is equipped with a vertical steel ladder with non-slip treads and a retractable extension section to facilitate safe access to the EUV. 8. Cable Entrance and Accessory Penetrations. Wall penetration assemblies are provided for cable and power entry at EUV exterior walls. The specific location, dimensional layout and number of conduits required for the cable entrance facility will be specified by the Engineer. Cable entry wall penetration devices are designed to be water tight and are provided with a drain petcock that allows bleeding of moisture from the ductwork that has collected behind the seal within the cable entry device. 9. Sump. A sump is located in the corner of the EUV floor as shown on the plans. The discharge from the sump is directed through a pipe to a storm drain system outside the EUV structure as shown on the plans. 10. Finish. The finish on remote enclosures and any painted or non-metallic housings for the EUV shall have an exterior durability of at least five years without blistering, peeling, chalking or delaminating in all climates. The topcoat shall have a uniform color and texture consistent with good commercial practice. Adequate primary protection is applied to all metallic surfaces prior to painting. The finish on the interior walls of the EUV shall be light in color to provide a high reflectance surface. Finish textures shall be matte or flat rather than glossy to aid in distributing light evenly and minimize reflected glare

4 All interior structural surfaces shall be painted or otherwise finished to prevent emissions of particles when contact is made with the surface. All interior surfaces shall be moisture and mold resistant, and will not flake, chip, dust, spall, or dissolve in contact with water. 11. Construction. The construction of the Vault shall be cast in place as shown on the plans in accordance with Item 420, Concrete Structures. The excavation for the construction of the Vault shall conform with Item 400, Excavation and Backfill for structures. Temporary shoring shall be provided as shown in plans and where necessary in accordance with Item 403, Temporary Special Shoring. The Contractor will be required to protect all project elements previously installed including but not limited to: drainage systems and utilities, 12. Floors. Floors shall be coated with epoxy paint. 13. Alarms. Remote alarm shall be provided for the following conditions: a. High water alarm activated when water level exceeds a preset level b. High temperature alarm activated when temperature exceeds a preset level c. High humidity alarm activated when humidity exceeds a preset level (75% RH) d. Smoke alarm activated on the detection of smoke 3. Electrical Requirements. A. Switchboard: EUV s shall be furnished with U.L. listed, free-standing 480Y277 volt switchboards in accordance with Special Specification 8308, Low-Voltage Switchboards, and as indicated on the drawings. B. Motor Control Centers: EUV s shall be furnished with U.L. listed, free-standing motor control centers in accordance with Special Specification 5710, Motor Control Centers, and as indicated on drawings. C. Distribution Panel. EUV s shall be furnished with U.L. listed, wall-mounted 480Y277 volt distribution panelboards in accordance with Special Specification 8306, Panelboards, and as indicated on the drawings. D. Branch Circuit Panelboards. EUV s shall be furnished with 480Y277 volt and 208Y120 volt branch circuit panelboards in accordance with Special Specification 8306, Panelboards, and as indicated on the drawings. E. Receptacles. Receptacles shall be installed as shown on the plans. All receptacles shall have circuit breaker protection. Electronic equipment receptacles shall be NEMA type 5-20R or as required to match electronic equipment plugs

5 Convenience outlets shall be NEMA type 5-20R and shall have Ground Fault Circuit Interrupter Protection. Air Conditioning receptacles shall match air conditioning equipment. F. Lighting. Energy efficient, white, fluorescent lights shall be used to provide a minimum interior illumination level of 30 foot candles. The lighting is designed to provide an initial level at least 25% greater (50% maximum) than the stated requirement to allow for losses due to lamp lumen depreciation and dirt accumulation in the luminary. A manually operated light switch needs to be provided in the entranceway to allow control of the lights when the entranceway hatch is closed. A battery operated set of emergency lights shall be provided. The battery shall be capable of powering the emergency lights for a minimum of 90 minutes. G. Wiring. The equipment shelter shall be fully wired and all wiring within the equipment shelter shall be neatly wrapped and routed such that opening and closing the door or raising or lowering the back panel will not twist or crimp the wiring. No cable pressure points shall be present. All wires shall be cut to the proper length before assembly. No wires shall be doubled back to take up slack. Harnesses to connectors shall be covered with PVC sheathing, woven braid or braided. Cables shall be secured with nylon cable clamps. Cable slack shall be provided to facilitate removal and replacement of assemblies, panels and modules. All harnesses and wiring shall be color-coded. All electrical connections in the equipment shelter, including relays, flashers, terminal strips, etc., shall have sufficient clearance between each terminal and the equipment shelter to provide an adequate distance to prevent a leakage path or physical contact under stress. All equipment grounds shall run directly and independently to the ground bus. The lay of the interconnect cable between the components must be such that when the door is closed, it does not press against the cables or force the cables against the various components inside the equipment shelters. Sufficient length of cable shall be provided to easily reach the electronic equipment placed anywhere on the shelves. All wiring containing line voltage AC shall be routed and bundled separately and/or shielded from all low voltage, i.e., control circuits. All conductors and live terminals or parts, which could be hazardous to maintenance personnel, shall be covered with suitable insulation material. All conductors used on the equipment shelter wiring shall be stranded No. 22 AWG or larger. Conductors shall conform to MIL SPEC MIL-W , Type B or D. The insulation shall have a minimum thickness of 10 mils. All wiring containing line voltage shall be a minimum size of No. 14 AWG. All conductors between the main power circuit breakers and the signal power bus shall be a minimum size 10 AWG stranded copper. All AC service lines shall be of sufficient size to carry the maximum current of the circuit or circuits they are provided for. Conductors for AC common shall be white. Conductors for equipment ground shall be green. All other conductors shall be a color different than the foregoing

6 H. Terminal Blocks. Terminal blocks located on the panels shall be accessible to the extent that it shall not be necessary to remove the electronic equipment from the cabinet to make an inspection or connection. Terminal blocks shall be 2 positions, multiple pole barrier type. Shorting bars shall be provided in each of the positions provided along with an integral marking strip. Terminal blocks shall be so arranged that they shall not upset the entrance, training and connection of incoming field conductors. All terminals shall be suitably identified by legends permanently affixed and attached to the terminal blocks. Not more than 3 conductors shall be brought to any 1 terminal screw. No electrically energized components or connectors shall extend beyond the protection afforded by the barriers. All terminal blocks shall be located below the shelves. Terminals used for field connections shall secure conductors by means of a No nickel or cadmium plated brass binder head screw. Terminals used for interwiring connections, but not for field connections, shall secure conductors by means of a No nickel plated brass binder head screw. As a minimum, all connections to and from the electronic equipment shall terminate to an interwiring type block. These blocks will act as intermediate connection points for all electronic Input/Output. All terminals shall be permanently identified in accordance with the equipment shelter wiring diagram. Where through-panel solder lugs or other suitable connectors are used, both sides of the panel shall be permanently attached and as close to the terminal strip as possible and shall not be affixed to any part which is easily removable from the terminal block panel. I. Equipment Shelter Internal Grounding. The equipment shelter internal ground shall consist of 1 or more ground bus-bars permanently affixed to the equipment shelter and connected to the grounding electrode. Bare stranded No. 1/0 AWG copper wire shall be used between the bus-bars and between bus-bar and grounding electrode. Each copper ground bus-bar shall have a minimum of 20 connector points, each capable of securing at least one No. 10 AWG conductor. AC neutral and equipment ground wiring shall return to these bus-bars. J. Transient Suppression. Transient suppression devices shall be placed on the coil side of all relays in the equipment shelter. DC relay coils shall have, as a minimum, a reverse biased diode across the coil. AC relays shall have MOV s or equivalent suppression across their coils. K. Surge Protection. 1. Protector and Equipment Shelter Configuration. All ungrounded conductor wires entering or leaving the equipment shelter shall be provided with surge protectors. The conductor leads and the surge protector leads shall be kept as short as possible with all conductor bends formed to the maximum possible radius. The protector units shall be located as near as possible (6 in.) to the entry or exit point, and as far as possible from any electrical equipment. The protector ground lead shall be connected directly to the ground bus. The surge protector utilized for AC power shall not dissipate any energy and shall not provide any series impedance during standby operation. The unit shall return to its non-shunting mode after the passage of any surge and shall not allow the shunting of AC power

7 2. Signal Wires. Each signal wire entering or leaving the equipment shelter shall have two-stage surge protection with the following characteristics: a. Protector shall have input, output and ground connections; b. Peak surge handling capability. 4,000 amperes 8 x 20 microsecond waveform; c. Protector life. Must withstand a minimum of fifty 2,000 amperes 8 x 20 waveform surges. d. Response time. Calculated element speed of 1 x seconds, measured speed of less than 20 nanoseconds. e. Protector clamp voltage; shall be specified by the Contractor so as to be consistent with the equipment being protected and submitted to the Engineer for approval. L. Transformers. Shall be 480 volt 3 wire to a 120/208 volt 3 phase, 4 wire with copper wound core, Square D class 7400, 150 Deg C temp rise with percent taps. See drawings for requirement. M. Fan/Lighting Control PLC Based. This component shall meet the requirements shown on the plans and shall conform to the special specification. N. Addressable Fire Alarm system. This component shall meet the requirements shown on the plans and shall conform to the specification. O. Security/Fire Camera backbone and controls. This component shall meet the requirements shown on the plans and shall conform to the specification. 4. Submittals. Provide complete shop drawings, for review by the Engineer, for each EUV including, but not limited to, the following: A. Complete structural drawings showing arrangement of reinforcing steel, concrete thickness, leave-outs and sleeves for piping, vents and conduit access, and embedded anchors for equipment such as ladders. Include dimensions for all embeds, leave-outs and sleeves. B. Complete interior drawings showing arrangement of all equipment and devices described in Electrical Requirements paragraph above. Include locating dimensions for all equipment and devices and Code-required working clearances for all electrical distribution equipment. Dimensions of all electrical equipment shall correspond to dimensions shown in equipment submittals. Submit shop drawings in drawing format used for design drawings. Provide a minimum of eight (8) copies of submittal for review by Engineer. Each submittal shall include a unique identifying number, assigned by Contractor, to be used for tracking purposes. Identifying number for materials being re-submitted to Engineer for second, and subsequent, reviews shall add a unique alphabetic suffix to original identification number. Submittals shall be approved prior to beginning fabrication of vault

8 5. Documentation. Each Electric Underground Vault shall be provided with the following documentation: A. Three complete and accurate equipment shelter wiring diagrams. B. The wiring diagrams shall document every harness wire termination in the equipment shelter. It shall be the Contractor s responsibility to provide updated drawings if any discrepancies are discovered. Prior to final acceptance of a equipment shelter, the Contractor shall provide a reproducible tracing of the equipment shelter wiring diagrams. C. One set of the documentation shall be placed in the equipment shelter in a heavy duty plastic envelope approved by the Engineer. The other documentation shall be delivered to the Engineer. 6. Testing and Warranty. Testing of the EUV shall be in compliance with Article 2 of Special Specification, Testing, Training, Documentation, and Warranty. Warranty of the EUV shall be in compliance with Article 5 of Special Specification, Testing, Training, Documentation, Final Acceptance and Warranty. 7. Measurement. This Item will be measured as each Electrical Vault unit constructed and equipment and components installed as shown on the plans, in accordance with this special specification. 8. Payment. The work performed and materials furnished in accordance with this Item and measured as provided under Measurement will be paid for at the unit price bid for each Electric Underground Vault (EUV) shown on the plans. Excavation, temporary shoring, backfill and all work associated with the construction of the EUV and installation of equipment and components shall not be paid for directly but shall be considered incidental to this pay item. This price shall be full compensation for all equipment described under this Item with all cables and connectors, equipment shelter foundation, documentation and testing, and for furnishing all labor, materials, training and equipment necessary to complete the work