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INTERNATIONAL, REGIONAL, NATIONAL NORMS & STANDARDS FOR ELECTRICAL SYMBOLS

2021-08-18T09:37:00.001-07:00

Standards used for making electrical drawings varies for different countries or region. For example, japan uses their national JIS standards while many of African or Asian countries uses IEC Standards.

Below we have listed some international, regional or national standards which are used for graphical documentation of electrical & electronic symbols.

IEC- International Electrotechnical Commission

ISO- International Organization for Standardization

BS- British Standards

ANSI- American National Standards Institute

NEMA- National Electrical Manufacturers Association

JIS- Japanese Industrial Standards

GB- Guobiao Standard (Chinese National Standards)

IEEE- Institute of Electrical and Electronics Engineers

UL- Underwriters Laboratories

CSA- Canadian Standards Association

DIN- Deutsches Institut für Normung

EN-CEN- European Committee for Standardization

GOST- Gosudarstvenny Standart - Russian / Euro-Asian

NOM-NMX- Official Mexican Standard

If you know about any other standards which is not mentioned in above list please write it down in comments section.

Explosionproof or Flameproof Definition

2021-07-19T04:13:00.000-07:00

Hello,

In this post we are discussing about Explosion Proof products.

so, what does Explosionproof or Flameproof mean?

The terms Explosionproof & Flameproof have the same meaning. In that they are constructed in such a way that an internal ignition of a flammable atmosphere will not be transmitted outside of the enclosure and thereby preventing the ignition of surrounding flammables.

Flameproof is a preferred method of protection when the electrical equipment may potentially have high energy arcing/sparking components in normal operation and therefore the formation of an explosion when in a hazardous atmosphere is not easily avoided

If you have any question regarding this, please tell us in the comments.

Instrument Transformer Types, Use & Advantages

2021-06-16T06:09:00.002-07:00

Instrument Transformers are widely used in protection circuits of power systems. They are used for the operation of Over Current, Under Voltage, Earth Fault and various other types of relays.

Types of Instrument Transformers:

Transformer used for measurement of Current is called "Current Transformer" or "CT" in short.
Transformer used for measurement of Voltage is called "Voltage Transformer" or "Potential Transformer" or "PT".

Why use of Instrument Transformer?

When it comes to measure Voltage, Current, Power & Energy; it is very important to use moderate size of instruments or meters in Commercial Metering. In power systems, currents and voltages are of very high values, so measurements of such high currents and voltages is not possible with meters of moderate size and cost.
As a solution to this problem, we have to use instrument transformers to step down currents and voltages so that they can be metered with moderate sized instruments.

Advantages of instrument Transformers:

Instrument of moderate size can be used.
Instrument and Meters can be standardized.
Single range Instrument can be used to cover large current & voltage ranges.
Metering circuit is isolated so insulation is not a problem for the operator.
Low power consumption in metering circuit.
Operating several instruments using single instrument transformer.

Feel free to leave a comment if you have any questions.

Thank You.☺