1. ESTW/ Castor The company has to take care that: Equipment and switchgears are operated according relevant standards The errection, extension and maintenance of the switchgears and equipment are carried out by qualified technicians or under supervision of a qualified technician The switchgear or equipment will be sorted out in case of dangererous condition. Weaknesses are immediately eliminated Obligations of the Company Devic e

2. ESTW/ Castor § 7 BGV A3 BGI 548 The voltage free state is given and guaranteed for the duration of the work Working in the neighbourhood of a switchgear (ecxceptions § 8 BGV A3) is only allowed, if: Active parts are secured for the duration of the work by covering or fences The minimum distances are kept. Coverage for nominal voltages upt to 1 000V Coverage or fences for nominal voltages over 1 kV, with additional air gap Limit Distances of the Danger Area

3. ESTW/ Castor § 7 BGV A3 BGI 548 The minimum distances should be Following protection distances are valid for activities of technician or instructed persons or for supervised works Following protection distances are valid for civil works and other non-electrical works at the neighborhood of active parts. Distance Limits

4. ESTW/ Castor 5 safety Rules

5. ESTW/ Castor Fünf-Sicherheits-Regeln International

6. ESTW/ Castor 1. Check of the voltage testing device 4. Volting testing device at refence voltage 2. Volting testing device at refence voltage Red light 3. Testing of the equipment at all poles Green light Red light Process of a Voltage Check or

7. ESTW/ Castor The cable in trenches will be exclusively cut with agrounded hydraulic scissor. No one is allowed to stay in the trench during that work ! Ground and Short Circuit Short circuit in a trench Exception  Zero voltage is given  and the course in the trench can be indentified! Grounding and short circuit is mandatory at the connection of cable and overhead line.

8. ESTW/ Castor Additional rules for switchgears with nominal voltages over 1 kV For works on transformers, both sides are to be grounded and short ciruit, even if the nominal voltage on the LV side is under 1 kV. This rule is also valid for three or multiple winding transformers. Beside grounding and short-circuit at the working location, at least one switching location must be earthed and grounded for overhead lines with a nominal voltage from 1 kV up to 30 kV. For higher nominal voltages, all switching locations have to be grounded and short circuit. Grounding and short circuit at one of the next poles is allowed in case of pole breakers. For works on cables, isolated lines, electrical equipment, which is connected over spur cables or isolated lines (i.e. motors) grounding and short-circuit is not mandatory. But all switching locations must be grounded and short-circuit. Grounding and short circuit is mandatory at the connection of cable and overhead line.. Grounding and Short Circuit

9. ESTW/ Castor Working Release The working location can be only released for working by the responsible, if  Condution allowance (VE) exists  All measures according DIN VDE 0105 ‑ 100 have been carried out  The responsible person of the switchgear has released the working allowance to the working responsible  All persons, which are involved to the work, are instructed by the working responsible.  The working release must be clearly formulated.  Therefore a written form for the working release is mandatory for most distribution companies according the operation manual.  (Contents: local conditions, grounding and protection measures, working distances, possible dangers)

10. ESTW/ Castor Activities can only be started, if the working responsible (AVO) has released the working location. The working responsible defines the scedule of work and coordinates the works of the workers in the plant. Works should be only carried out, if a order exists. The working area should only be left via the defined exit! The 5 safety rules have to be kept under all conditions ! The necessary protection clothes have to be used! Behaviour at the Working Location

11. ESTW/ Castor Energizing after Termination of the Works It is very important to check the working location for tools or materials, which have been left, before removing the safety measures. Eventually, commissioning tests have to be carried out. Energizing must be carried out with the same accuracy as for the de- energizing before the works. Normally this will be done in the reverse order. Safety measures should be only removed, if all persons have left the danger area. Short circuit and grounding equipment should be removed at the working location at first and than at the other locations. First remove the short circuit and than the grounding! Then the siwitchgear has to be assumed to be under voltage !

12. ESTW/ Castor Energizing after Termination of the Work!

13. ESTW/ Castor DIN VDE 0105 - 100 Dangers during change of fuses: Interruption under load => arcs Change of fuses => weak protection against direct touch Loaded fuses should only be changed: at circuits with low power by using load breakers at first if available for LV fuses with approbriate tools, handled by instructed persons or technicians. Personal protection clothes (PSA) have to be used! Fuse load breaker Change of Fuses

14. ESTW/ Castor Helment with face protection Protection hand cuff Safety shoed S2 or S3 Isolating suit Heavy flammable clothes NSpg.-LiBo Personal Protection Equipment Die Safety association BGFE recommends the exchange of thermoplaqstic helments after 4 years and duroplastic helmets after 8 years

15. ESTW/ Castor Switching with Second Person NO statement about no. Of persons in VDE 0105-100 and BGV A3 Exception: BGV A1 dangerous works (working under voltage) „Dangerous works are works with a higher danger potential due to the process, the kind of work, the used materials or the environmental conditions. A higher degree of danger can be caused by mechanical, electrical, chemical, biological, thermal influence or radiation.“ All switching actions have to be carried out by two persons in switchgears with no protection against dangerous impacts of arc flash or electrical strike. If – exceptionally – a dangerous work has to be carried out by one person, approbriate measures have to be taken:  other persons should be in visual distance  regular control patrols  information system in regular time steps