1.0. Purpose
This method statement uploaded by HSE Documents covers the onsite construction of Emergency Central Battery system as Define in the project specifications.
2.0. Scope of Works
The scope of this Method Statement uploaded by HSE Documents is to detail the method of installation to ensure that Emergency Central Battery system is correct, acceptable and confirm to the contract document specification and international standard.
3.0. References
3.1. QCS.
3.2. Project General Specification Section.
3.3. Approved Project Electrical drawings.
3.4. Manufacturer recommendations I installations instruction.
3.5. Project Safety Plan.
3.6. Approved Material Submittals.
4.0. Safety
Project safety plan shall be adhered during the complete Installation of Emergency Central Battery system. Necessary safety precautions shall be taken care of:
4.1. All employees shall wear PPE which shall be fit for purpose.
4.2. Safe access to the place of work shall be provided for all employees, including installation at height.
4.3. Only qualified and competent electricians shall perform the work in accordance with relevant codes and practice.
4.4. Good House Keeping shall be performed prior to leaving the work area.
4.5. Refer to the Risk Assessment sheet for Emergency Central Battery system installations.
5.0. Responsible personnel
The following is list of personnel's who will be responsible for carrying out the installation of Emergency Central Battery system:
5.1. Safety Engineer
5.2. Project Engineer - Electrical
5.3. QA I QC Engineer - Electrical
5.4. Supervisor / Forman - Electrical
5.5. Testing & Commissioning Engineer
6.0. Tools/Tackles
Complete set of electrical tool boxes shall be available at site:
6.1. Electrical-powered tools: Drill, grinder.
6.2. Hand tools: Screw drivers, Screw driver with line tester, pliers, wrenches, crow bar, and hammer.
6.3. Meters: Insulation test meter, VOA meter.
7.0. Material Readiness / Preparation
7.1. Site Engineer and Supervisor shall ensure that necessary materials, complete tools and tackles are available at site prior to the commencement of works.
7.2. All Central Battery materials shall be inspected upon delivery to site.
7.3. Material Inspection form shall be raised and submitted to consultant for inspection.
7.4. The material shall be stored in a clean and dry area.
8.0. Application
Emergency Central Battery System material shall be installed as per QCS, [Company and or International or Local requirements and standards], Regulation, Local Civil Defence Standard, IFC and approved shop drawings.
9.0. Method of Installation
9.1. The Electrical Engineer and Supervisor I Foreman shall be possession of approved drawings and set of the lighting lay-out where the proposed CBS routes are based from the drawings.
9.2. All the installation works are to be carried out in accordance with the approved shop drawings. Copy of the approved method statement shall be available at site during the installation works.
9.3. Manufacturer recommendations and manual instructions shall be strictly adhered at the installation of system.
9.1. Inverters (s)
9.1.1. Format and Protection
9.1.2. The inverter comprises a number of 1.5 and 3.0 KVA modules each complete with l/P & O/P MCBs.
9.2. Fuse less system
9.2.1. Each module is protected from reverse battery polarity.
9.2.2. Input - 110V DC from battery. Giving a safe voltage for switching and handling.
9.2.3. Output Voltage, Frequency and Waveform
9.2.4. Adjustable 220V - 240V 1phase 50 selectable ±0.01% stability
9.2.5. Voltage stability is ±1% static and ±5% dynamic. Recovery in 100msec
9.2.6. Equipment does not require synchronization with mains.
9.2.7. The output is sinusoidal with <3% harmonic distortion.
9.2.8. The inverter uses high frequency PWM technology at 19.2 kHz switching frequency.
9.3. Load
9.3.1. The inverter will supply up to 200% load without voltage drop or distortion for 15 sec.
9.3.2. The inverter will supply 3.25 X full load RMS for 10 sec. into a short circuit, for clearing distribution fuses or MCBs in the event of a load fault. This will not damage the inverter.
9.3.3. The inverter will supply loads of 150% FLC for 1 min. and 125% for 15 min. without being out of tolerance.
9.3.4. There is full thermal, MCB and electronic overload protection for the inverter
9.3.5. The inverter will not be damaged by a back feed from mains of any phase or frequency. And will treat this in the same manner as a /c load.
9.3.6. The inverter will work into any load power factor and can tolerate almost any type of load, including tungsten lamps.
9.3.7. The delay from loss of mains to full output is nominally set at 0.5 sec to avoid jitter during brownouts.
9.3.8. The output voltage rise time is 30 msec.
9.3.9. Inverter noise level is 55dBA at 1m.
9.3.10. Overall efficiency is 87% to 90% depending on rated performance.
9.3.11. The Display Panel is an integral part of our Static Inverter units. Please see the enclosed page on 'Operation' - Status Display. We assure you that this is the most extensive display on a Static Inverter and gives the desired information in detail.
9.3.12. Emergency-Lite system offers a greater overload protection than specified. Our system has a standard overload factor of 200% for 15 sec and 150% for 1 minute and 120% for continuous period up to 3 hours with full output. Please see our catalogue for ICEL requirements.
9.4. General
9.4.1. Please note that our system doesn't require any sub-panel. This is a totally addressable intelligent system and has been designed in such a way that less number of hardware is required for better reliability.
9.4.2. The Emergency-lite system does not rely on the use of an intermediate display panel. The system health check can be performed from the central monitoring PC, as all luminaires are addressable. Zonal identification can be set up at the commissioning stage. The central monitoring PC can be interfaced into the Building Management System. Emergency-lite System has Lon Works output as standard for interfacing with the BMS and complies totally with the requirement.
9.4.3. Not having an intermediate panel reduces unnecessary maintenance cost and eradicates the possibility of panel failure resulting in any addressable circuit appearing blind or unmonitored from the central PC. Any combination of testing i.e. yearly or weekly or daily or hourly is possible. The BS5266 recommends testing every day. There is no limitation on the timeframe for the records to be stored.
9.4.4. Testing (push button facility) can be conducted with limitations via the static inverter units or with full interrogation via the central PC without the need for visiting each zonal location.
9.5. Substation - Sub circuit Monitoring
9.5.1. A monitoring interface at the beginning of each circuit known as a sub circuit monitor is used and individual address modules are connected to each emergency luminaire for addressing. The sub circuit monitor has the power-switching relay. This circuit supplies power to all the emergency lamps on the switched circuit.
9.5.2. Emergency-lite offers the most unique substation that can support 40 luminaires in 2 circuits of 20, fused at SA each. The maximum total cable run from each substation should not be more than 200m. Wiring topology is free. It is however recommended to distribute the luminaires as evenly as possible across 2 circuits. We can mix maintained, non-maintained, switched etc. on the same circuit. The substation can also have 4 sets external switched and un-switched control supply. The sub-station is mounted in a compact steel enclosure that is fitted in the riser or ceiling spaces. It is powered from a single-way one the local emergency lighting distribution board.
9.5.3. The system allows maintained, non-maintained & switched luminaries on the same circuit.
9.6. Luminaries Interface
The luminaire interface (LTC) provides the control and addressing functions within the individual luminaires. It is a compact device supplied ready into the luminaires where the luminaires are supplied by Emergency-lite, or is available loose for fitment into other mains luminaires where these are supplied by others. The LTC controls the luminaire in either non-maintained, maintained, or switched-maintained mode according to the programming of the system. Each LTC also provides a local switched input to allow direct individual switched control of the luminaire if required. Also provide is a local un-switched monitoring input, which is enabled/disabled via the software. The LTC is compatible with all fluorescent luminaires which use DC-compatible high frequency control gear. It is compatible with mains-voltage filament lamps, and low voltage diachronic where these employ high frequency control gear. Note that the LTC is not compatible with dimming systems. Luminaires using wire-wound ballasts must not be connected to the LTC.
Dimensions of LTC - 116.Smm L x 24.5mm W x 22mm H.
9.7. Control Unit (optional - to provide external test input)
The Control Unit is used to house multiple substations at one location, if required. It retains all the functions of the substations mounted within it, and in addition provides an external test input point. This input point allows the user to plug in a laptop and perform tests from this point. Control Units are available in different versions to house up to a maximum of 6 substations. A wall mounting "Rittal" type metal box is used. It is powered from a single way on the local emergency lighting distribution board.
9.8. Construction
Emergency-lite Central Inverter cabinet is made of 2.0mm Zintec Steel (superior to baked enamel with primer treatment). This is modular without any welds (stronger). Inverter cabinets can be supplied in CKD condition for ease of site access. The cabinet is supplied in RAL 5015 colour as standard. M 12 Lifting Eyes and Leveling Feet are provided for the ease of Lifting/Moving/Leveling and are supplied as a standard. These features are provided in order to make this system as installation friendly as possible.
9.9. Battery
9.9.1. Format
9.1.1.1 The battery is in a series of separate cabinets.
9.1.1.2 The battery consists of 54 or 60 cells giving 108 or 120VDC depending on equipment rating.
9.1.1.3 Each battery cabinet feeds a 2 pole MCB for isolation.
9.1.1.4 Type - Battery is VRLA type having 10-year life to 856240 Parts 1-4.
9.1.1.5 Duration - The battery will provide 3 Hours Autonomy.
9.1.1.6 Maintenance
9.1.1.7 Temperature may be from 5°to 30°, but higher temperatures should be avoided. 20°C is optimum.
9.1.1.8 Most battery or switchgear rooms are suitable.
9.1.1.9 Care should be taken to avoid large variations in temperature, or cycling caused by air conditioning or heating systems.
10. Red Line Drawing
10.1. Upon completion of Installation Emergency Central Battery, inverters and all Emergency light fittings shall be marked on a layout drawing used line drawing.
10.2. Red line drawing shall be ready at the time of testing.
11. Testing
11.1. Testing and commissioning to be carried out as per the attached testing & commissioning procedure.
12. Attachments:
12.1. Installation Methodology
12.2. Method Statement Checklist
12.3. LTC Wiring Details
12.4. Address data sheets
12.5. Testing and Commissioning Sheet
12.6. Risk Assessment
12.7. PTW
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