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The combustion temperature is T1. Each gas data must be thoroughly pretreated 
Determine the equipment 
Electrical equipment suitable for use in hazardous areas should be marked with a mark 
It provides protection. The mark starts with the sign where it came from 
Internationally agreed to show the protection of the explosion, still with the type, and 
Where it relates to the group that has been approved for this equipment and with it 
Temperature classification. An example of the tagging would be Ex d IIB T5.

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رفع اتصالی فیوز برق فوری و انی با تکنسین وارد و ماهر برق امداد برق تهران تلفن۲۲۵۸۶۱۳۵-۷۷۲۲۷۲۰۵ شرق تهران برقکار شبانه روزی 

Equipment will also be marked with atex CE 0000 II 2 G mark. CE suitable for use 
In the European Association, 0000 Registration Number for the Certificate Examination, II 
Anti-explosion, 2 floors and G suitable gas TLRPHONE 02122586135 – 02177227205
Almost all of the accessories described in this chapter include switches, sockets 
And boxes, are available in versions with different risk protection classes.

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Distribution equipment and decorative lights, which are discussed in Chapters 6 and 7 
Available in a variety of protection options. 
Designing Electrical Services for Buildings 24 
the area 
The enclosure is used to preserve the soil, dust, moisture and kicking fingers. 
This is a separate issue of explosion protection; a piece of electricity

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Equipment may be installed outdoors and protected against weather 
There is no risk of explosion, or it may be non-flammable inside a specific dusty appearance 
Atmosphere 
An internationally agreed system for determining the degree of education has been developed 
The protection is provided by the enclosure. This includes IP letters and two digits. 
These letters are for international protection, and the digits indicate the degree 
Protection The first digit, which may range from 0 to 6, describes the protection against

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The entry of solids of the second digit, which may range from 0 to 8, describes the protection 
Against the entry of liquids. In both cases, the larger number is its degree 
Protection Definitions of protection levels are given in Tables 1.3a and 1.3b 
Which is based on BS EN 60529. Specifications for the degree of protection provided by

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Enclosure (IP code). 
This classification procedure can be applied to all equipment used in this area 
The season and distribution equipment and lighting discussed in Chapter 6 and 7. 
So the area that remains rain may be set to 1P23 while the one is 
The jetproof can be 1P55.

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Table 1.3a Protection of individuals against contact 
With live or moving parts inside the compartment 
Protecting equipment against solid penetration 
External body (protection against contact with 
Moving parts inside the enclosure are limited to 
Contact moving parts inside the compartment 
Which may harm people) 
the first

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Characteristic 
Integer 
Degree of protection 
۰ Protecting people against contact with living or moving parts inside 
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Protection of equipment against the entry of solid bodies is not solid. 
۱ Protection against accidental or indirect contact with live or moving parts 
For example, inside the chamber by a large surface of the human body 
Hand, but not protection against deliberate access to such parts. 
Protection against the entry of large exterior bodies.

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۲ Protection against contact with live or moving parts in the chamber by 
fingers 
Protection against moderate interior solid bodies. 
Accessories 25 
۳ Protection against contact with live or moving parts in the enclosure by 
Tools, cables or objects with a thickness of more than 2.5 mm. 
Small penetration protection. 
۴ Protection against contact with live or moving parts in the enclosure by

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Tools, cables or objects with a thickness of more than 1 mm. 
Small penetration protection. 
۵ Full protection against contact with live or moving parts inside 
The compartment 
Protect against harmful dust deposits. The entry of dust is not complete 
But the dust can not enter sufficient amounts to interfere with it 
The satisfactory operation of the equipment is enclosed.

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۶ Full protection against contact with live or moving parts inside 
The compartment 
Protection against dust penetration. 
Table 1.3b Protection of equipment against entry 
From the liquid 
Second feature 
Integer 
Degree of protection 
۰ without protection

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۱ Liquid water droplet protection: 
The drops of compressed water in the compartment should not be harmful 
Effect 
۲ Liquid droplet protection: 
A falling liquid droplet should have harmful effects on the compartment 
Angled up to 15 degrees at any angle from the vertical. 
۳ rain protection:  ۲۲۵۸۶۱۳۵ telephone barghemdad tehran
The rain falls at an angle of up to 60 degrees, depending on the vertical 
Should have harmful effects. 
۴ Saturation Protection:

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The spray fluid should not have any harmful effect in any direction. 
۵ Protection against water jet: 
Water is declared by a nozzle of any direction

Conditions are not exposed to any harmful effects. Protection on deck conditions (deck equipment): Water from heavy seas should not enter the compartment in the permitted range. ۷ Protection against immersion in water: Water must not be entered into the compartment below the declared pressure and time conditions.

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Electricity is shipped in metal conductors that must be insulated as well 
Must be protected from mechanical damage. When the conductor is insulated 
A piece of electrical power can be converted into a cable. This 
The nomenclature makes a simple and logical distinction between a bare conductor and a 
Insulated cable, but in practice the term “conductor” and “cable” are actually used

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It is an alternate and only field that explains what is being referred to. 
We will try to avoid confusion and first discuss the conductors and insulations. 
It was then applied to them.

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Conductors 
The most commonly used conductor in Kabul is copper. Only other guidance is used 
Aluminum copper is used for the first time, although it has aluminum 
Weakness is much weaker than copper. As a result, BS 7671 states that 
Minimum cross section is 16mm2

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. This is the biggest asset of aluminum 
Cheaper than copper, it’s lighter and its price is less dependent on fluctuations. 
Conductors are usually made up of each other, except for the mallest sizes  ۲۲۵۸۶۱۳۵ telephone barghemdad tehran

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A number of small cables, called strings, to create a larger cable. Cable made in this 
The path is more flexible than a single-size cable and thus easier 
Handle Each layer is on the cable in the opposite direction 
The previous layer reduces the chance that the strings will be affected by it 
From bending forces when installing the cable. ۱ mm 
Solid core 1.5mm2 
And 
۲٫۵mm2 
As the core or string is available, the higher sizes are available as the string 
Core only 
Insulation 
Each conductor must be insulated so that it does not separate, it keeps the current in the inside

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Conduct and prevent leakage from the conductor accidentally during it 
Lengths of different types of insulators are in use. 
Pvc thermoplastic 
Polyvinyl chloride is one of the most commonly used human ingredients today. This is a human being 
Thermo plastic that is hard, non-combustible and chemically inactive. Its chairman 
The problem is that it softens temperatures above 70 ° C.

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It will not be destroyed 
The age and wiring of insulated PVC cables should not be renewed again 
The way the wiring was insulated with most older materials. PVC insulated cable 
Includes the type of cable described above with a continuous layer or PVC sleeve 
Around them. The only limitation on this type of cable is that it should not be used 
The ambient temperature is above 70 ° C.

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Insulation 
Existing plastics are available as an alternative to PVC that has the advantage 
Able to work at higher temperatures. The most common XLPE is mutual 
Polyethylene is one of the other hard-core ethylene-propylene rubber options 
The composition, which is determined by HEPR. These materials are typically used only on cable 
Which has armored cables over insulators and an outer sheath over armor.

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The outer sheath is generally PVC. The subsequent construction is similar to PVC 
The armored cable of the wire shown in Figure 2.3 is the only difference between the two 
Insulation of XLPE or HEPR instead of PVC. ۲۲۵۸۶۱۳۵ telephone barghemdad tehran

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Butyl rubber 
This insulation is used for cables used at high temperatures. This is for 
For example, for immersion heater for final connections, control wiring is used 
Heaters of hot air and free air. It can be used safely for the environment 
The temperature is up to 85 ° C. Butyl rubber has a higher resistance to natural moisture 
Tires.

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Silicone rubber 
It is completely moisture resistant and suitable for temperatures from -60 ° C to 
۱۵۰ ° C, after repeated repetition to boiling water and low pressure steam, 
And that’s why it’s used in hospital equipment that needs to be cleaned. 
Although it is destroyed by fire, the ash is non-conductive and continues to serve 
As insulation if it can be held in place. Hold tape of tape silicon glass,