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BS EN 50628:2016 Erection of electrical installations in underground mines, 2016
- EN50628{2016}e.pdf [Go to Page]
- Contents Page
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 General [Go to Page]
- 4.1 General requirements
- 4.2 Initial inspections
- 4.3 Competence of personnel
- 4.4 Documentation
- 5 Means of protection against electric- and electrostatic charging
- 6 Rooms and Locations [Go to Page]
- 6.1 Electrical service rooms
- 6.2 Closed electrical service rooms
- 6.3 Other rooms
- 7 Protection against fire spreading [Go to Page]
- 7.1 General requirements
- 8 Insulation, Insulation-resistance and its check [Go to Page]
- 8.1 Insulation
- 8.2 Value of insulation resistance
- 8.3 Insulation resistance check
- 9 Signboards, labels, wiring diagrams, inscriptions [Go to Page]
- 9.1 General requirements
- 10 Nominal voltages [Go to Page]
- 10.1 General requirements
- 10.2 Voltage ranges
- 11 Protection against electrical shock [Go to Page]
- 11.1 Requirements for basic protection [Go to Page]
- 11.1.1 Protection by basic insulation of live parts
- 11.1.2 Protection by barriers or enclosures
- 11.1.3 Protection by obstacles and placing out of reach
- 11.2 Requirements for fault protection
- 12 Protection in IT-Systems [Go to Page]
- 12.1 General
- 12.2 Earth fault detection in IT-systems
- 12.3 Design of IT system
- 12.4 Insulation monitoring
- 12.5 Protective conductor
- Figure 1 — Examples for the connecting of the devices to the protective conductor, inside or outside from cables (From left to right: Ex-proofed version, non-Ex-proofed version, cable entry)
- Table 1 — Cross-section of the protective conductor inside cable
- Table 2 — Cross-section of the protective conductor inside cable in case of rapid disconnect [Go to Page]
- 12.6 Electrical protection devices in IT-systems
- 12.7 Design of cables being monitored by a protection device
- 13 Protection in TN-systems [Go to Page]
- 13.1 TN-S- systems with residual current devices (RCD)
- 13.2 TN-S System without residual current devices (RCD)
- 14 Other means of protection
- 15 Protection against danger caused by mechanical influence on non-intrinsically safe cables [Go to Page]
- 15.1 General requirements
- 15.2 Cables to supply mobile electrical equipment
- 15.3 Cable in areas of mining activities or road heading areas till 50 m far from the road heading face
- 16 Intrinsically safe electrical systems [Go to Page]
- 16.1 General requirements for selection
- 16.2 Descriptive system document
- 16.3 Erection
- 16.4 Separation of intrinsically and non-intrinsically safe circuits
- 16.5 Separation of different intrinsically safe circuits
- 16.6 Earthing
- 16.7 Cable for intrinsically safe systems
- 17 Installation of transformers
- 18 Substations
- 19 Disconnecting devices in line of each switch-gears
- 20 Switchgears
- 21 Couplers and connectors [Go to Page]
- 21.1 General requirements for use of couplers and connectors
- 21.2 Additional requirements using couplers
- 22 Luminaries and lighting installation
- 23 Cables [Go to Page]
- 23.1 Design of cables
- 23.2 Conductor materials
- 23.3 Current carrying capacity
- 23.4 Coverings and outer protective covers
- 23.5 Different circuits within one cable
- 23.6 Laying out of cables
- 23.7 Glanding, terminating or making off
- 23.8 Laying out of non-insulated conductors
- 23.9 Additional requirements for the use of single core cable
- 24 Protection of electrical equipment or installation against overcurrent [Go to Page]
- 24.1 Overcurrent protection devices
- 24.2 Overload protection
- 24.3 Short circuit protection
- 24.4 Minimum short circuit current
- 25 Calculation of short circuit currents
- 26 Additional requirements for systems and equipment with nominal voltage of more than 1 kV up to 6,6 kV in production areas and road heading [Go to Page]
- 26.1 General requirements
- 26.2 Switchgears
- 26.3 Test of insulation resistance of non-alive cable in production areas and road headings
- 26.4 Insulation monitoring of alive systems
- 26.5 Earth fault protection in IT systems
- 26.6 Monitoring of non-alive systems
- 26.7 Electrical protection devices for feeding cables of electrical equipment
- 26.8 Cable design
- 27 Additional requirements for cable entry selection
- Annex A (informative) Documentation
- Annex B (normative) Tables and figures regarding free space
- Table B.1 — Minimum sizes of free space according to Figure B.1 for operating, testing and maintaining switchgears within substations
- Figure B.1 — Free space of open and capsulated switch-gears
- Table B.2 — Minimum clearance and minimum distances for protection
- Figure B.2 — Protection distances and height
- Annex C (informative) Example for a galvanically separated system (in production areas or road headings)
- Figure C.1 — Example 1
- Figure C.2 — Example 2
- Annex D (informative) Example for calculation (according to 12.3.6)
- D.1 General
- D.2 Legend
- D.3 Necessary system parameters
- D.4 Determination of the reference points of the system
- Figure D.1
- D.5 Calculation of the capacitive earth fault current and displaying in a figure (see Figure D.2)
- Table D.1 — Cable-section
- Figure D.2
- D.6 Overlay of capacitive and inductive earth fault current IeL – IeC = IeB.
- Figure D.3
- D.7 Calculation of the voltage drop caused by the wattles component of the earth fault current
- D.8 Calculation of the voltage drop caused by the active component of the earth fault current
- D.9 Resulting voltage drop UF by geometrical addition
- Table D.1 — Average value for earth capacity of cable – ambient temperature of 20 C
- Annex E (informative) Table for cables suitable for underground workings
- Table E.1 — Suitable cables for power systems
- Table E.2 — Suitable cables for communication systems
- Annex F (informative) Table for current carrying capacity of cables suitable for underground workings
- Bibliography [Go to Page]
