General engineering graphical symbol series

BS 1553: Specification for graphical symbols for general engineering.

Part 1 Piping systems and plant. This section deals with graphical symbols for use in the creation of flow and piping plant and heating and ventilation installations. Part 2 Graphical symbols for power generating plant. Includes steam and internal combustion engines and turbines, also auxiliary plant. Part 3 Graphical symbols for compressing plant.

Includes applications to air operated switchgear.

Fluid Power Systems and Components BS 2917-1 Specification for Graphical Symbols

Electrical Power

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3939-1

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-2

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3

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-5

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6

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7

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-8

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9

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General information and general index

Symbol elements, qualifying symbols and other symbols having general application Conductors and connecting devices Basic passive components Semiconductor and electron tubes Production and conversion of electrical energy

Switchgear, control gear and protective devices Measuring instruments, lamps and signalling devices Telecommunications, switching and peripheral equipment Telecommunications and transmission

Architectural and topographical installation plans and diagrams Binary logic elements Analogue elements.

Engineering diagram drawing practice is covered by BS 5070 and is available in three parts. Part 1. Recommendations for general principles. Sets out drawing practice common to all fields on engineering diagrams. Covers layout, types of diagrams, drawing sheets, lines, lettering and graphical symbols. BS 5070-3. Recommendations for mechanical/fluid flow diagrams.

Gives principles and presentation for mechanical, hydraulic, pneumatic topographic, block, circuit, piping, interconnection and supplementary diagrams. To be read in conjunction with BS 5070: Part 1. BS 5070-4. Recommendations for logic diagrams. Principles and presentation. Covers signal names, characteristics and logic circuit diagrams. To be read in conjunction with Parts 1 of BS 5070 and BS EN 61082-2.

BS EN 61082-2. Rules for function-oriented diagrams, function diagrams and circuit diagrams.

The diagrams which follow are representative of various branches of engineering and obviously every application will be different. The examples can only indicate the type of diagram one is likely to encounter. The standards listed will provide a valuable source of information relating to layout content and the appropriate symbols to be used.

Table 27.1

1

2

3

4

5

Direct current Alternating current Positive polarity Negative polarity

Propagation, energy flow, signal flow, one way

Terminal strip, example shown with terminal markings

Junction of conductors

Double junction of conductors

Crossing of conductors with no electrical connection

Data highway

Note - The longer line represents the positive pole, the short line the negative pole. The short line may be thickened for emphasis ryyy^ Inductor, coil, winding, choke Inductor with magnetic core prrq

La-A-AJ

Inductor with tappings, two shown

Transformer with magnetic core

Machine, general symbol The asterisk is replaced by a letter designation as follows: C synchronous converter G generator GS synchronous generator M motor

MG machine capable of use as a generator or motor MS synchronous motor

Socket (female), pole of a socket

Plug (male), pole of plug

Plug and jack, _q telephone type, two-pole Note - The longest pole on the plug represents the tip of the plug, and the shortest the sleeve

Battery of accumulators or primary cells

Fuse, general symbol Form 1

Conductor, group of conductors, line, cable, circuit, transmission path (for example, for microwaves)

Three conductors

Fuse with the supply side indicated

Connecting link, closed Connecting link, open

Circuit breaker

Conductors in a cable, three conductors shown

Earth or ground, general symbol

Antenna

A Ammeter Oscilloscope

Galvanometer

Polarized capacitor, for example, electrolytic

Variable capacitor

Make contact normally open, also general symbol for a switch

Break contact

Change-over contact, break before make

Contactor, normally open Contactor, normally closed

Operating device (relay coil), general symbol

Coil of an alternating current relay

Mechanical coupling

Wattmeter

Earphone

Loudspeaker

Transducer head, general symbol

Clock, general symbol

* Laser (optical maser, ^ general symbol)

Amplifier

_0|_ Semiconductor diode, general symbol

Light emitting diode, general symbol

Tunnel diode

Table 27.1 (Contd) —Q-( — — Coaxial plug and socket

* Variability, non-inherent

Pre-set adjustment

Resistor, general symbol

Variable resistor

Resistor with sliding contact

Heating element

Capacitor, general symbol

Watt-hour meter

Signal lamp, general symbol

Spotlight

Luminaire, fluorescent, general symbol

With three fluorescent tubes

Bell Buzzer

Microphone

Triode thyristor, type unspecified

PNP transistor

NPN transistor with collector connected to the envelope

Unijunction transistor with P-type base

Junction field effect transistor with N-type channel

Photovoltaic cell

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Responses

  • pierino fallaci
    What are the bs50701 symbols?
    8 years ago
  • nunzio
    What is included in bs2917?
    8 years ago

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