METHOD STATEMENT FOR PUBLIC ADDRESS SYSTEM

METHOD STATEMENT FOR PUBLIC ADDRESS SYSTEM 

A method statement is a document that describes how to do a task safely. You can think of a method statement like a set of instructions or a plan for the work. Method statements are also known as safe systems of work, safe work method statements or SWMS for short. This method statement details the method of installation of Public Address System. IS 1882 (1993) can help us to understand as per Indian board. We analyse with two points 1. Installation & 2. Testing & Commissioning.

INSTALLATION

1. Material under PAS

1.1 All materials shall be as per approved material submittals.

1.2 Type of cable shall be as per approved shop drawings / system manufacturer’s recommendation.

1.3 Type of Speakers shall be as per approved shop drawing / system manufacturer’s recommendation.

1.4 Type of Amplifier / Controller shall be as per approved shop drawing / system manufacturer’s recommendation

2. Applicable Location

2.1 Indoor or outdoor open or closed Public Areas, Meeting rooms, Lobby, Workstations, Rest Room, Exit staircase etc.

2.2 Need to check direction or velocity of wind / Air flow, trees at boundary, ambient noise level at different place.

3. Storage of Product

3.1 All materials received at site shall be inspected and ensured against approved material submittal.

3.2 Any discrepancies, damages etc. shall be notified immediately for further action.

3.3 Material found not suitable for the project are to be removed from site immediately.

3.4 Speaker cables shall be stored with the factory packing on the flat surface.

3.5 Materials shall be stacked properly as per manufacturer’s recommendation and covered to prevent dust and water / moisture.

3.6 Public Address Equipment to be stored as per manufactures recommendation mentioned / marked in the packing.

3.7 Ambient condition of the storage place to be as per manufacturer’s recommendation.

4. Installation of Speaker Cable

4.1 Ensure the relevant current / approved shop drawings are available with installation team.
4.2 Transfer the cable to the work place with the help manpower..
4.3 Check the cable drum for any external damage during transportation and ensure the type of cable against area of usage / application.
4.4 Type of the cable is as per approved shop drawings.
4.5 In concealed application pull Speaker cable manually through conduit installed as per approved shop drawings and approved method statements.
4.6 Leave enough length of cable at both ends of panel and devices for termination.
4.7 No through joints is allowed without the sanction of the Consultants.

5. Public Address Equipment’s

5.1 Ensure the relevant current / approved shop drawings are available with installation team.

5.2 Transfer the equipment to the work place with the help of manpower.

5.3 Location of the panel to be as per approved shop drawing after coordinating with other services.

5.4 Fixing holes will be marked properly keeping back box of the panel in place.

5.5 Fix back box properly and fix remaining panel accessories.

6. Installation of SPEAKERS

6.1 Ensure the relevant current / approved shop drawings are available with installation team.

6.2 Exact location of the device to be as per approved reflected ceiling plan for surface / recessed installation

6.3 For the Speakers, which needs to be fixed on the false ceiling, fix junction box of the camera above false ceiling.

6.4 Install the Speakers and terminate the cable properly.

7. Records

7.1 Fill QC Installation Check List duly signed-off by Site in Charge / Consultant
7.2 Inspection request duly signed-off by Sight in Charge / Consultant.

Testing and commissioning

8. Method

Find / connect the manufacturer representative’s detailed method statement and test formats for testing and commissioning of Public Address System covering the mechanical checks, switching ON the unit. Must be calculate speaker load and amplifier load before switching ON the unit and Programming and testing.

The whole system will be commissioned and certified by the manufacturer’s representative or certified persons before handing over.

9. Records

9.1 Commissioning procedure with test results should attached
9.2 Inspection request duly signed-off by Consultant should attached
9.3 Certification of installation by manufacturer’s authorised / certified representative.

10. Attachment

10.1 Manufacturer’s representative method statement detailing the pre-commissioning and commissioning procedures, including test formats.
10.2 Escalation matrix or after sales service complete Name with number.
10.3 User Manual with Does and doesn’t instruction.

General installation considerations

·        DO NOT run microphone cables near mains, data, telephone or 100V line cables

·        DO NOT exceed 90% of the amplifiers output power when using 100V line (speech only)

·        DO NOT exceed 70% of the amplifiers output power when using 100V line (high level background music only)

·        DO NOT use re-entrant horn loudspeakers for background music unless the loudspeaker has been specifically designed for this purpose

·        AVOID jointing the microphone cable, when this is unavoidable make sure a good screened connector is used, e.g. XLR

·        ALWAYS use a balanced or floating low impedance microphone terminating into a balanced input on long microphone cable runs

·        ENSURE that all loudspeakers are in-phase

·        ENSURE that there are no short circuits on the loudspeaker line before connection ot the amplifier

·        You must NEVER mix 100V line and low impedance speakers on the same system.