Activities for the maintenance and repair of electrical networks and equipment that consumes and converts electricity require measures to ensure human safety from exposure to electric current. The use of safety signs and posters in electrical installations is associated with the need to ensure that operations with switching devices are prohibited (turning on or off) so that during work (repairs, etc.) no one accidentally applies voltage to the electrical equipment.
Prohibition posters
Based on the name of these posters, their main purpose is to prohibit certain actions with switching installations, so that during maintenance activities on electrical devices they are not accidentally supplied with power.
“ Working under tension. Do not turn it on again! "- no one is allowed to re-turn on the overhead line switches after they have been automatically turned off, without prior consent from the work manager. This type of poster is hung on all overhead line control keys when repair work is carried out on live equipment (U).
" Dangerous! Electric field! Passage is prohibited without protective equipment ” is installed on outdoor switchgear with U exceeding 330 kV at a height of 1.8 meters on the fences of areas with U exceeding 15 kV per meter. It informs about the high probability of dangerous effects of an electric field on operating personnel and prohibits their movement in the work area without personal protective equipment.
" Do not turn on. People are working " is a portable sign used on electrical installations with U over 1 thousand Volts. It is installed on all drives, buttons and control keys of switching equipment and means that power supply to the line is prohibited.
" Do not turn on! Work on the line "is a portable sign installed on all drives and control keys of switching devices. It prohibits power supply to the line.
Features of manufacturing electrical safety signs
It is recommended that all signs and posters be made of dielectric material, and signs on concrete and metal surfaces should be applied with paints using stencils. Metal can only be used where they will not come into contact with parts of electrical equipment that may be live. All posters must be clearly visible. In the dark, signs must be illuminated.
For more details, please see the document “INSTRUCTIONS FOR USE AND TESTING OF PROTECTION MEANS USED IN ELECTRICAL INSTALLATIONS”: Read the document
Warning posters
The main purpose of such information signs is to notify personnel about approaching at an unsafe distance to parts of equipment that are under high voltage.
“ Stop! Voltage " - used in installations with U over 1 thousand Volts. The sign notifies you of being in close proximity to live parts of an electrical installation.
" Don't get in! Will kill " - this sign informs about the danger of approaching live parts when climbing a structure.
" Trial! Danger to life " - this sign is mounted on workplace barriers during high-voltage tests and warns of the danger of electric shock.
" Carefully! Electrical voltage - used in electrical installations of any substations and power stations. It warns against the danger of approaching live parts of the installation.
Prescriptive
Prescriptive posters serve to notify personnel and other people about the places organized for work, methods of access to equipment and actions with it. These are portable signs with a standard size of 100˟100mm or 250˟250mm.
WORK here
It is made in the form of a green (sometimes blue) square with a white circle in the center, inside of which a prescriptive inscription is written in black letters. Intended for use in electrical installations related to electrical stations and substations. Located at the site where installation or repair work is carried out.
CLIMB HERE
The “GET IN HERE” safety sign is made in the form of a green square with a white circle, in the center of which there is an inscription in black font. The poster must be installed on structures and staircases leading to the place of repair or installation work for the safe movement of personnel.
By nature of application
This classification for electrical safety posters and signs allows you to determine whether the device will be installed on a permanent basis or whether it is portable. The first, for the most part, include signs, for example, voltage indicators, which are a triangular information plate with a stylized image of lightning.
Stationary
Of the types listed above, these include the signs given in paragraphs 5 and 6, as well as the warning poster from paragraph 10
Portable
All other posters that were discussed are portable, that is, those that are installed in new places.
It makes sense to create sets of portable posters only when standard maintenance or repair of electrical network components or equipment powered by it is performed. In such cases, you can take a certain number of mandatory, prohibitive or other safety posters and signs, including “danger to life” signs, in advance.
Thumbnail pictures of safety posters, part 1:
At the end of the article you can download posters in quality suitable for printing in large format.
Go to the second part of the posters.
