Electronics Plans and Specifications

 

 

The drawing sheets sizes, contents, and title blocks contained in electronics documents.

Drawing Sheets Sizes
Electronics plans and drawings shall be drawn on drawing sheets of the following sizes:

A0 size (841mm x 1189mm)
A1 size (594mm x 841mm)
A2 size (420mm x 594mm)
A3 size (297mm x 420mm)

Drawing Scale
Appropriate metric drawing scales shall be used.

Graphic Scale
Since the size of the drawings sheet can be changes photographically, graphic scale shall be shown on each drawing sheets.

Contents
The content of the plan shall have the following information:

♦ Location and Site Plans
♦ Legend and Symbols
♦ General Notes and or Specifications
♦ Floor plan of Head-end Facility
 

Shall show the dimension and layout of the following:
equipment racks, outlets, lighting, circuit breakers, electrical panel, ventilation and air-conditioning system, generator, battery bank, data center, control and monitoring equipment, studio facility, antenna system, doors and grounding system.

♦ Cable TV Distribution Layout
(Fiber, Coaxial, Copper Network)
The plan shall consist and indicate the specification, location, type, size, dimension, length, and run of the following:

For building installation - service entrance facility, head-end, data, equipment, cables, optical nodes, amplifiers, power supplies, splitters, couplers, inverters, taps, outlets, cabinets, hand-holes, manholes, pull boxes, closures, conduits, trays and grounding system.

For outside plant installation - based map, cables, optical nodes, amplifiers, power supplies, splitters, couplers, power inverters, closures/cabinets, poles, guying, alley arm, pedestal cabinets, hand-holes, manhole, and grounding system.

♦ One Line Diagram of Head-end System
Shall indicate the name, description and specification of the following:
Satellites for TVRO, size of satellite dish, antenna, LNB, satellite receivers, modulators, de-modulators, processors, encoders, routers, cable modem termination system (CMTS), routers, network switches, optical line termination (OLT), servers, scramblers, combiners, splitters, power dividers and other associated equipment.

♦ One Line Diagram of Distribution System
Shall indicate signal levels, attenuation losses, insertion losses and powering.

Standard Title Block
This should be provided with the Code. I'm using an A3 size dimensions (25 x 20 x 20, 20 x 15 x 15) cm.

In practice I used the following for clarity and more specific:

network, placement, mounting, characterization, legend, specification, coverage area, and bills of materials.

Excerpts | Philippine Electronics Code book III, Cable Television System

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Location:Iligan City, Lanao del Norte, Philippines

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