Entrepreneurs are responsible for the safety and health protection in their companies. According to the occupational health and safety regulations they have to ensure that all necessary protection measures are taken and observed when working at electrical systems. Therefore the relevant parts of the installation are disconnected from power supply when working at electrical systems and equipment. Just tripping a switch to disconnect from mains, however, is by far not enough. There is no clear and safe evidence of the de-energised state and the hazard potential of electrical energy can not be excluded. After a system has been disconnected from power supply and before finally giving permission to work, reliable information is needed regarding the state of the installation, measures to be taken for avoiding maloperations or malfunctions, as well as information about protection against upcome maloperations or malfunctions and protection against potential hazards from adjacent parts of the installation. In order to avoid the above hazards, the 5 common safety rules have been formulated:
- Disconnect completely
- Secure against reconnection
- Verify that the installation is dead
- Carry out earthing and short-circuiting
- Provide protection against adjacent live parts
Every electrician is familiar with these rules as life insurance.
Any measure, however, is just as safe as the technologies used
and the appropriate application by the electrically skilled staff.
Do not leave vital information to chance
Independent from the operating or switching status all electrical systems and equipment must principally be regarded as live until safe evidence of the contrary is provided. Therefore, the voltage detectors used must provide reliability and clear perceptibility of indication and the necessary electrical safety for the user. This applies to both, the test procedure and the test result. Both has to be reliable. This, however, always also depends on the skill of the electrician when applying the test equipment.
Test equipment produced decades ago is hardly capable of fulfilling the safety requirements of today. Additionally the switchgears of today require only an eighth of the space needed for switchgears produced 30 years ago. Thus the safety requirements for the test equipment must be upgraded. More compact system constructions require shorter distances between the live parts within those systems. Furthermore these setups increase the variety of interferences on the test equipment used. Therefore the demand for the utilisation of operational equipment in accordance with the generally approved technical rules is not made without reason.
Protective devices and facilities have to be provided with a standard conform type label. They must only be used for systems they are suitable and designed for according to the type label.
Devices and tools without type label, manufacturer’s name (logo), specification of nominal voltage range, double triangle with standard reference or double isolator have to be withdrawn from further use. The entrepreneur has to make sure that protective devices and tools are inspected for their proper state before every use, and within determined intervals, for their keeping of the limit values specified in the electrotechnical regulations. The set terms shall allow for any faults that may arise to be realised duly.
The in-service inspection intervals depend on the ambient conditions as there are:
- Frequency of application,
- Stressing by ambient conditions and transport.
At least every 6 years there has to be an in-service inspection of capacitive voltage detectors as required by the BGV A3 (Accident Prevention & Insurance Association regulation A3) (new TBRS 2131).
Safety from one source – because safety is indivisible.
Because of our quality-related thinking, closeness to our customers and a diversified service programme, DEHN + SÖHNE is your reliable partner for safety equipment:
- We offer a consulting service advising on the specialities of the working methods and the selection of suitable safety equipment and devices. We provide, for example, a survey for using our voltage detectors in factory-assembled switchgear.
- We offer seminars on occupational safety in electrical systems with confirmation of participation.
- We offer services such as the maintenance tests for voltage detectors exeeding 1 kV.