Rubber dielectric protective equipment

Among the means that protect personnel from electric shock, the most widespread are dielectric gloves, galoshes, boots and carpets. They are made of rubber of a special composition, which has high electrical strength and good elasticity. However, special rubber is destroyed under. exposed to heat, light, mineral oils, gasoline, alkalis, etc., easily damaged mechanically.

Dielectric seals

Dielectric seals are made of two types:

Dielectric gloves for electrical installations up to 1000 V, in which they are used as the main protective tool when working under. voltage. These seals must not be used in electrical installations above 1000 V;

Dielectric gloves for electrical installations above 1000 V, in which they are used as an additional protective tool when working with basic insulating protective equipment (rods, high voltage indicators, insulating and electrical clamps, etc.). In addition, these dielectric seals are used without the use of other protective equipment during operations with drives of disconnectors, switches and other equipment with voltages above 1000 V.

Dielectric gloves designed for electrical installations above 1000 V can be used in electrical installations up to 1000 V as the main protective agent. Gloves should be put on to their full depth, pulling the bell of the gloves over the sleeves of the clothes. It is unacceptable to wrap the edges of seals or lower the sleeves of clothing over them.

In electrical installations seals made of dielectric rubber, seamless or with a seam, five-fingered or two-fingered, can be used. In electrical installations, it is allowed to use only dielectric gloves marked with the protective properties of Ev and En. The length of the prints must be at least 350 mm. The size of dielectric seals should allow knitted gloves to be worn under them to protect hands from low temperatures when working in cold weather. The width along the bottom edge of the seals should allow them to be pulled over the sleeves of outerwear.

Rules for the use of dielectric gloves

Before using gloves, inspect them, paying attention to the absence of mechanical damage, contamination and moisture, and also check for punctures by twisting the gloves towards the fingers.

Each time before use, dielectric seals must be boiled by filling them with air for tightness, i.e. to identify through holes and tears in them, which can cause electric shock to a person.

When working with gloves, the edges are not allowed to turn up. To protect against mechanical damage, it is allowed to wear leather or canvas gloves and mittens over seals.

Gloves in use should be washed periodically, as necessary, with soda or soapy water, followed by drying.

B8, B24 Dielectric galoshes, boots.
Dielectric galoshes and boots as additional protective equipment are used in operations performed with the help of basic protective equipment. At the same time, boots can be used both in closed and open electrical installations of any voltage, and galoshes - only in closed electrical installations up to 1000 V inclusive.
In addition, dielectric galoshes and boots are used as protection against step voltages in electrical installations of any voltage and any type, including overhead lines power transmission. Dielectric galoshes and boots are worn on ordinary shoes, which must be clean and dry.
Dielectric shoes must be different in color from other rubber shoes. Galoshes and boots should consist of a rubber top, a rubber corrugated sole, a textile lining and internal reinforcing parts. Shaped boots can be produced unlined. Boots must have lapels. The height of the bot must be at least 160 mm.
The norms and frequency of electrical tests of dielectric galoshes and boots are given in the "Rules for the use and testing of protective equipment used in electrical installations."

B9, B25. .Dielectric carpets and insulating pads.

1. Dielectric rubber carpets and insulating stands are used as additional electrical protective equipment in electrical installations up to and above 1000 V. Carpets are used in closed electrical installations, except for damp rooms, as well as in open electrical installations in dry weather. Stands are used in damp and polluted rooms.
2. Carpets are manufactured in accordance with the requirements of the state standard, depending on the purpose and operating conditions of the following two groups: 1st group - normal performance and 2nd group - oil and petrol resistant.
3. Carpets are made with a thickness of 6 ± 1 mm, a length of 500 to 8000 mm and a width of 500 to 1200 mm.
4. Carpets must have a grooved front surface.
5. Carpets must be of one color.
6. The insulating support is a flooring fixed on support insulators with a height of at least 70 mm.
7. Flooring with a size of at least 500 ´ 500 mm should be made from well-dried planed wooden planks without knots and slant. The gaps between the slats should be 10-30 mm. Planks should be connected without the use of metal fasteners. The flooring must be painted on all sides. It is allowed to make flooring from synthetic materials.
8. Stands must be strong and stable. In the case of using removable insulators, their connection to the flooring must exclude the possibility of slipping of the flooring. To eliminate the possibility of overturning of the stand, the edges of the flooring should not protrude beyond the supporting surface of the insulators.
Operating rules
9. Carpets and coasters are not tested in operation. They are examined at least once every 6 months. as well as immediately before use. If mechanical defects are found, the carpets are removed from service and replaced with new ones, and the coasters are sent for repair. After repair, the stands must be tested according to the acceptance test standards.
10. After storage in a warehouse at negative temperature carpets before use must be kept in packaged form at a temperature of (20 ± 5) ° C for at least 24 hours.

Good day, dear friends!

I recently passed an exam at Rostekhnadzor for the right to conduct high voltage tests. As they say now free for a whole year.

Today I will continue the series of articles on protective equipment. Today, the subject of my story will be dielectric gloves.

Purpose and general requirements

Gloves are designed to protect hands from injury electric shock. They are used in electrical installations up to 1000 V as the main insulating electrical protective agent, and in electrical installations above 1000 V - additional.

In electrical installations, gloves made of dielectric rubber, seamless or with a seam, five-fingered or two-fingered, can be used.

In electrical installations it is allowed to use only gloves marked with protective properties Ev and En.

The length of the gloves must be at least 350 mm.

The size of dielectric gloves should allow knitted gloves to be worn under them to protect hands from low temperatures when working in cold weather.

The width along the bottom edge of the gloves should allow them to be pulled over the sleeves of outerwear.

Performance tests

During operation, electrical tests of gloves are carried out. Gloves are immersed in a bath of water at a temperature of (25±15) °C. Water is also poured into the gloves. The water level both outside and inside the gloves should be 45-55 mm below their upper edges, which should be dry.

The test voltage is applied between the body of the bath and the electrode, which is lowered into the water inside the glove. It is possible to test several gloves at the same time, but it must be possible to control the value of the current flowing through each tested glove.

Gloves are rejected when they break down or when the current flowing through them exceeds the normalized value.

A variant of the test setup scheme is shown in the figure.

The norms and frequency of electrical testing of gloves are given in the article “ protective equipment. Electrical tests.”

At the end of the test, the gloves are dried.

Terms of use

Before use, the gloves should be inspected, paying attention to the absence of mechanical damage, contamination and moisture, and also check for punctures by twisting the gloves towards the fingers.

When examining, you should first of all pay attention to the stamp:

You can immediately notice the difference between this stamp and the stamp, which is placed, for example, on UVN. The difference is that the voltage class up to which their operation is possible is not written on the gloves. This is due to the fact that gloves in all electrical installations with voltages above 1kV are an additional protective tool.

When working with gloves, their edges are not allowed to be tucked. To protect against mechanical damage, it is allowed to wear leather or canvas gloves and mittens over gloves.

Gloves in use should be washed periodically, as necessary, with soda or soapy water, followed by drying.

That's all I have for today. Next time I will tell you about the installation on which I test protective equipment.

Good luck and see you soon.

In the article, we will consider the GOST requirements for dielectric gloves, what length they are, their correct use, safety and reliability checks of products, and their cost.

If your work is related to heavy-duty electrical installations, then please note that you cannot do without dielectric gloves. They isolate the electrician's hands from electric shock.

Gloves in accordance with GOST

Requirements for use for gloves are set in GOST 12.4.183-91. In accordance with GOST, these gloves are used to work with electrical installations up to a thousand volts (in this case, this is the main protection) and over a thousand (here gloves are used exclusively as additional remedy protection). But keep in mind that the use of dielectric gloves is prohibited if a single-pole voltage indicator up to a thousand volts is used. If speak about temperature regime, then this type of gloves is used at temperatures from -40 ° C to +30 ° C. These gloves are also used when working with a vane pump.

In GOST there is a regulation on the technology for the production of dielectric gloves: they must be made from latex. In such cases, there should be no seams on the gloves.

In addition, sheet rubber can be used to make gloves. Then the presence of seams is permissible (this is regulated by TU 38305-05-257-89).

Gloves can be marked Ev (such a product is used as an additional means of protection in an installation where the voltage is more than a thousand volts) or En (and this type of gloves can be used as the main means of protection when the current is up to a thousand volts).

What length are dielectric gloves?

The smallest length that is allowed to be used for dielectric gloves is at least 35 cm. The fact that dielectric gloves come with two or five fingers is also important.

When choosing dielectric gloves, consider their size. It is necessary that they be fairly loose (so that additional gloves can be worn under the bottom). This is very important if you have to work at low temperatures and when servicing an electrical installation in a cold season. For the cold season, prepare thermal gloves or warm woolen ones that can be worn under a pair of dielectric ones. What else is important to consider? The width of the bell mouth of the gloves should be such that it stretches over the sleeve from above (if you have to work outdoors in the winter, give preference to those that can stretch over the sleeves of thick outerwear). If it is necessary to protect dielectric gloves from damage, then leather or canvas mittens can be worn over them. By the way, do not tuck the edges of dielectric gloves, this cannot be done.

How to use dielectric gloves?

When using dielectric gloves, follow specific rules. Check the expiration date before using the product. A product that has expired is dangerous to use. Under these conditions, the latex dries out, becomes brittle and does not provide adequate protection. It can also burst at the most inopportune time.

Gloves of such a plan must be dry. It is impossible that they have at least some mechanical damage. Checking for the presence of mechanical defects should be as follows: twist your fingers to the side. If gloves need to be washed, then do this with a soap or soda solution. And do not forget to dry the products before use.

How are dielectric gloves tested?

Once every six months, gloves are checked with increased voltage. Therefore, before putting them on, see if the test is stamped on the product. It is carried out in this way: a metal bath is filled with water at room temperature, and gloves are lowered into it. Dielectric gloves are filled with water, their edges protrude above the water level by at least 5 cm. The protruding part of the gloves must be dry.

Also, for the test, a transformer, switching contacts, shunt resistance is needed. Also prepare a gas discharge lamp, a choke, a spark gap and a milliammeter. It is necessary that the test voltage be 6 kilowatts. The current through the glove cannot exceed 6 milliamps. The electrode must be lowered into the glove, which is connected to ground through a milliammeter. Connect the test transformer to the bath and ground it. To find a breakdown, the switch is placed in position A, and to measure the current - in position B. For a minute, a current is passed through the glove. If the current exceeds the normal value or a strong fluctuation is noticed, the glove can be considered defective and should not be used.

How much do dielectric gloves cost?

The price of such gloves is relatively low, especially considering their useful functions (besides, if used correctly, they will last for more than one year). The price varies from 200 to 600 rubles.

Dielectric gloves- are used when working with electricity to protect hands and fingers from electric shock.

Gloves warehouse position. You can easily buy dielectric gloves we have.

We guarantee the reliability and quality of the delivered goods. Our company is under the supervision of the Marine and River Registers.

The manufacturer guarantees that the product complies with the requirements of TU 38.306-5-63-97, provided that the consumer observes the conditions of operation, transportation and storage. Warranty period of storage of the product is 1 year from the date of manufacture.

Characteristics:

• Frost resistance coefficient at 30°С – 0.86;
• Elongation at break - 780%;
• Relative residual deformation after rupture - 18%;
• Tear resistance - 16 kN/m;
• Conditional tensile strength not less than - 11.5 MPa;
• Seam strength at break - 31 N / s.

Dielectric gloves are the main insulating agent in electrical installations up to 1000 (V) and additional electrical protective equipment in electrical installations above 1000 (V).

Gloves are made of natural latex. Length - 35 cm.

Gloves retain their properties when exposed to environment during the service life.

Contents of delivery:

Package Included:

• Gloves;
• Instruction.

Life time:

Service life 1 year.

Requirements for safety and environmental protection.

1.When using gloves special safety precautions must be observed.

2. Gloves should be tested every 6 months.

3. Forbidden use gloves expired testing or expiration date.

4. During operation, the product is explosion-, radiation-, electro-, chemical-safe.

5. The product does not affect the environment during operation:

• there is no chemical, electromagnetic, thermal and biological;
• toxic, polluting substances are not formed.

6. Disposal is carried out in accordance with Federal Law No. 89 F3 "On production and consumption waste", taking into account regional norms and rules.

Instructions for use.

1.1. Perform an external inspection of the product.

• conformity of the complete set to the product passport;
• the presence of a label on the product;
• no damage, dirt or moisture;
• date of the next test.

2. Survey.

A survey must be carried out before use;

3. Use of the product for its intended purpose.

3.1. Usage gloves not on purpose FORBIDDEN.

3.2. Perform product inspection.

3.3. The product is ready for its intended use.

3.4. Gloves should be worn over warm gloves winter time), pulling on the sleeve of work clothes.

3.5. It is unacceptable to wrap the edges of the gloves or lower the sleeves of clothing over them.

3.6. After use, wash with soapy water and dry in a warm room.

4. Transportation and storage.

Gloves allowed to be transported by any mode of transport without restrictions in closed vehicles. It is necessary to store far from heating elements at a temperature from 0 to 25 °C, relative humidity of air no more than 75%.

If you often work with powerful electrical installations, then you know that you need dielectric gloves that allow you to isolate the electrician's hands from electric shock.

Dielectric gloves GOST

Requirements for use and the gloves themselves are established by GOST 12.4.183-91 “System of labor safety standards. Hand protection materials. Technical requirements".

GOST also regulates the manufacturing technology of dielectric gloves: they must be made in a molded way from latex, in which case they are not allowed to have seams.

Gloves can also be made from sheet rubber. In this case, the presence of a seam is permissible (this is regulated by TU 38305-05-257-89).

Gloves may be marked Ev (these gloves are used as an additional means of protection in installations with a voltage of more than a thousand volts) or En (and these gloves can be used as the main means of protection at currents up to a thousand volts).

Length of dielectric gloves

The minimum length allowed for dielectric gloves must be at least 35 centimeters. What is more important: dielectric gloves can be with five fingers or two.

When choosing dielectric gloves, pay attention to their size. They should be loose enough that you can wear extra gloves underneath. This is extremely important when working at low temperatures and when servicing electrical installations in the cold season. At this time, warm woolen or thermal gloves, which you can wear under dielectric ones, will be very useful to you. What else is worth paying attention to? Choose the width of the bell mouth of the gloves so that you can pull it over the sleeve from above (so, if you work with gloves on the street in winter, choose those that will stretch over the sleeves of bulky outerwear). If you need to protect dielectric gloves from damage, you can put canvas or leather mittens on top of them. And by the way, it is forbidden to tuck the edges of dielectric gloves!

Rules for the use of dielectric gloves

When using dielectric gloves, it is very important to follow a few rules. First, before buying and before using, be sure to check the expiration date. Expired gloves are dangerous to use! Latex can dry out, become brittle and not provide adequate protection, or simply burst at the wrong time.

Ready-to-use dielectric gloves must be dry and free of any mechanical damage. At this point, they are checked by twisting towards the fingers. If gloves need to be washed, this should be done with a solution of soda or soap. And don't forget to dry them thoroughly before use!

Checking dielectric gloves

But that's not all. Once every six months, a special check of dielectric gloves is carried out using overvoltage(so be sure to check that the test is stamped on the gloves before use). It is carried out as follows: gloves are lowered into a metal bath filled with water at room temperature. Dielectric gloves must also be filled with water, their edge protrudes above the water level by at least five centimeters. The protruding parts of the gloves must be dry.

For testing, you will also need a transformer (1), switching contacts (2), shunt resistance (3), a gas discharge lamp (4), a choke (5), a milliammeter (6) and a spark gap (7).

The value of the test voltage is six kilowatts, the current that passes through the glove should not be more than six milliamps. An electrode is lowered into the glove, which must be connected to ground through a milliammeter. The test transformer should be connected to the bath and grounded. To search for a breakdown, the switch is placed in position A, and to measure the current - in position B. For a minute, a current is passed through the glove. If the current exceeds the norm or strong fluctuations are noticeable, the glove is considered defective and must not be used!

Cost of dielectric gloves

The cost of dielectric gloves is relatively low compared to their useful functions (and, by the way, if properly used, they can serve you for more than one year), and usually ranges from 200 to 600 rubles.

Upon completion of the tests, the gloves are dried, an appropriate stamp is applied to them and an entry is made in a journal designed to record tests of various protective equipment.

The use of dielectric gloves does not mean that you should neglect