NEN EN 50156-1 : 2015

Introduction
1 Scope
2 Normative references
3 Definitions
4 General requirements
   4.1 General considerations
   4.2 Environmental requirements
   4.3 Power supply
5 Incoming supply connections and devices for
   disconnecting and emergency stop
   5.1 Incoming supply and equipment connections
   5.2 Devices for disconnecting power supplies
   5.3 Emergency stop
6 Protection against electric shock
   6.1 Protection against direct contact
   6.2 Protection against indirect contact
7 Environmental protection of the equipment
   7.1 Protection against ingress of solid foreign
        bodies
   7.2 Protection against water
8 Equipotential bonding
   8.1 General
   8.2 Equipotential bonding as a protective measure
        in case of indirect contact
   8.3 Equipotential bonding for purpose of lightning
        protection
   8.4 Functional equipotential bonding
9 Auxiliary circuits
   9.1 Supply to auxiliary circuits
   9.2 Voltage for auxiliary circuits
   9.3 Connection to the protective conductor
   9.4 Overcurrent protection of auxiliary circuits
   9.5 Measures to prevent danger from short circuits
        to exposed conductive Parts or earth
   9.6 Influence of capacitance and leakage resistance
10 Additional requirements for the application of
   protective system
   10.1 General safety requirements
   10.2 Concept and scope definition
   10.3 Hazard and risk analysis
   10.4 Safety requirements allocation
   10.5 Design
   10.6 Installation and commissioning
   10.7 Safety validation
   10.8 Operation and maintenance
   10.9 Modification and retrofit
11 Electrical equipment
   11.1 General requirements
   11.2 Creepage distances and clearances
   11.3 Motors
   11.4 Transformers
   11.5 Switching devices
   11.6 Operator control devices
   11.7 Immersion electrodes
   11.8 Trace heating systems
12 Cables and cords
   12.1 General requirements
   12.2 Insulation
   12.3 Current carrying capacity
   12.4 Conductors of separate circuits
13 Warning signs and item designation
   13.1 Name plates, markings and identifications plates
   13.2 Warning signs
   13.3 Functional identification
   13.4 Marking of electrical equipment
   13.5 Item designations
14 Technical documentation
   14.1 Documentation describing functions and connections
   14.2 Documents for type approved components
   14.3 Documentation of the applications software
Annex A (informative) Fault models of microelectronic
        components
Annex B (informative) Configurations of programmable
        safety devices (PSD) with reference to EN 61508
Annex C (informative) Life cycle of programmable safety
        device of protective equipment
Annex D (informative) Management of functional safety
Bibliography

Defines requirements to meet the operating conditions of furnaces, to reduce the hazards of combustion and to protect the heated systems from damage e.g. by overheating.