---

NOTE A cable tray may be perforated or non-perforated.

[IEV 826-15-08]

cable trunking system

system of closed enclosures comprising a base with a removable cover intended for the complete surrounding of insulated conductors, cables, cords and for the accommodation of other electrical equipment

concurrent

acting in conjunction; used to describe a situation wherein two or more control devices exist in an actuated condition at the same time (but not necessarily synchronously)

conduit

part of a closed wiring system of circular or non-circular cross-section for insulated conductors and/or cables in electrical installations, allowing them to be drawn in and/or replaced

NOTE Conduits should be sufficiently close-jointed so that the insulated conductors and/or cables can only be drawn in and not inserted laterally.

[IEV 826-06-03]

control circuit (of a machine)

circuit used for the control, including monitoring, of a machine and the electrical equipment

control device

device connected into the control circuit and used for controlling the operation of the machine (for example position sensor, manual control switch, relay, contactor, magnetically operated valve)

3.10

controlgear

switching devices and their combination with associated control, measuring, protective, and regulating equipment, also assemblies of such devices and equipment with associated interconnections, accessories, enclosures, and supporting structures, intended in principle for the control of electrical energy consuming equipment

[IEV 441-11-03, modified]

3.11

controlled stop

stopping of machine motion with electrical power to the machine actuators maintained during the stopping process

3.12

direct contact

contact of persons or livestock with live parts

[IEV 826-12-03]

3.13

direct opening action (of a contact element)

achievement of contact separation as the direct result of a specified movement of the switch actuator through non-resilient members (for example not dependent upon springs)

[IEC 60947-5-1, K.2.2]

3.14

duct

enclosed channel designed expressly for holding and protecting electrical conductors, cables, and busbars

NOTE Conduits (see 3.7), cable trunking systems (see 3.5) and underfloor channels are types of duct.

3.15

electrical operating area

room or location for electrical equipment to which access is intended to be restricted to skilled or instructed persons, by the opening of a door or the removal of a barrier without the use of a key or tool, and which is clearly marked by appropriate warning signs

3.16

electronic equipment

part of the electrical equipment containing circuitry dependent for its operation on electronic devices and components

3.17

emergency stop device

manually actuated control device used to initiate an emergency stop function

[ISO 13850, 3.2]

NOTE See Annex E.

3.18

emergency switching off device

manually actuated control device used to switch off the supply of electrical energy to all or a part of an installation where a risk of electric shock or another risk of electrical origin is involved

NOTE See Annex E.

3.19

enclosed electrical operating area

room or location for electrical equipment to which access is intended to be restricted to skilled or instructed persons by the opening of a door or the removal of a barrier by the use of a key or tool and which is clearly marked by appropriate warning signs

3.20

enclosure

part providing protection of equipment against certain external influences and, in any direction, protection against direct contact

NOTE The definition taken from the existing IEV needs the following explanations within the scope of this part of IEC 60204:

1. Enclosures provide protection of persons or livestock against access to hazardous parts.

2. Barriers, shaped openings, or any other means suitable to prevent or limit the penetration of the specified test probes, whether attached to the enclosure or formed by the enclosed equipment, are considered as part of the enclosure, except where they can be removed without the use of a key or tool.

3. An enclosure may be:

• a cabinet or box, either mounted on the machine or separate from the machine;

• a compartment consisting of an enclosed space within the machine structure.

3.21

equipment

material, fittings, devices, components, appliances, fixtures, apparatus, and the like used as part of, or in connection with, the electrical equipment of machines

3.22

equipotential bonding

provision of electric connections between conductive parts, intended to achieve equipotentiality

[IEV 195-1-10]

3.23

exposed conductive part

conductive part of electrical equipment, which can be touched and which is not live under normal operating conditions, but which can become live under fault conditions

[IEV 826-12-10, modified]

3.24

extraneous conductive part

conductive part not forming part of the electrical installation and liable to introduce a potential, generally the earth potential

[IEV 826-12-11, modified]

3.25

failure

termination of the ability of an item to perform a required function

NOTE 1 After failure, the item has a fault.

NOTE 2 "Failure" is an event, as distinguished from "fault", which is a state.

NOTE 3 This concept as defined does not apply to items consisting of software only.

[IEV 191-04-01]

NOTE 4 In practice, the terms fault and failure are often used synonymously.

3.26

fault

state of an item characterized by inability to perform a required function, excluding the inability during preventive maintenance or other planned actions, or due to lack of external resources

NOTE 1 A fault is often the result of a failure of the item itself, but may exist without prior failure.

NOTE 2 In English, the term “fault” and its definition are identical with those given in IEV 191-05-01. In the field of machinery, the French term “defaut” and the German term “Fehler” are used rather than the terms “panne” and “Fehlzustand” that appear with this definition.3.27

functional bonding

equipotential bonding necessary for proper functioning of electrical equipment

3.28

hazard

potential source of physical injury or damage to health

NOTE 1 The term hazard can be qualified in order to define its origin (for example, mechanical hazard, electrical hazard) or the nature of the potential harm (for example, electric shock hazard, cutting hazard, toxic hazard, fire hazard).

NOTE 2 The hazard envisaged in this definition:

• either is permanently present during the intended use of the machine (for example motion of hazardous moving elements, electric arc during a welding phase, unhealthy posture, noise emission, high temperature);

• or can appear unexpectedly (for example: explosion, crushing hazard as a consequence of an unintended/unexpected start-up, ejection as a consequence of a breakage, fall as a consequence of acceleration/deceleration).

[ISO 12100-1, 3.6, modified]

3.29

indirect contact

contact of persons or livestock with exposed conductive parts which have become live under fault conditions

[IEV 826-12-04, modified

3.30

inductive power supply system

system of inductive power transfer, consisting of a track converter and a track conductor, along which one or more pick-up(s) and associated pick-up converter(s) can move, without any galvanic or mechanical contact, in order to transfer electrical power for example to a mobile machine

NOTE The track conductor and the pick-up are analogous to the primary and secondary of a transformer respectively.

3.31

(electrically) instructed person

person adequately advised or supervised by an electrically skilled person to enable him or her to perceive risks and to avoid hazards which electricity can create

[IEV 826-18-02, modified]

3.32

interlock (for safeguarding)

arrangement that interconnects guard(s) or device(s) with the control system and/or all or part of the electrical supply to the machine

3.33

live part

conductor or conductive part intended to be energized in normal use, including a neutral conductor, but, by convention, not a PEN conductor

NOTE This term does not necessarily imply a risk of electric shock.

3.34

machine actuator

power mechanism used to effect motion of the machine

3.35

machinery

machine

assembly of linked parts or components, at least one of which moves, with the appropriate machine actuators, control and power circuits, joined together for a specific application, in particular for the processing, treatment, moving or packaging of a material.

The term "machinery" also covers an assembly of machines which, in order to achieve the same end, are arranged and controlled so that they function as an integral whole

[ISO 12100-1, 3.1, modified]

NOTE The term "component” is used here in a general sense and it does not refer only to electrical components.

3.36

marking

signs or inscriptions primarily for the purpose of identifying equipment, components and/or devices, which can include certain features thereof

3.37

neutral conductor

N

conductor connected to the neutral point of a system and capable of contributing to the transmission of electrical energy

[IEV 826-14-07, modified]

3.38

obstacle

part preventing unintentional direct contact, but not preventing direct contact by deliberate action

3.39

overcurrent

current exceeding the rated value. For conductors, the rated value is the current-carrying capacity

[IEV 826-11-14, modified]

3.40

overload (of a circuit)

time/current relationship in a circuit which is in excess of the rated full load of the circuit when the circuit is not under a fault condition

NOTE Overload should not be used as a synonym for overcurrent.

3.41

plug/socket combination

component and a suitable mating component, appropriate to terminate conductors, intended for connection or disconnection of two or more conductors

NOTE Examples of plug/socket combination include:

• connectors which fulfil the requirements of IEC 61984;

• a plug and socket-outlet, a cable coupler, or an appliance coupler in accordance with IEC 60309-1;

• a plug and socket-outlet in accordance with IEC 60884-1 or an appliance coupler in accordance with IEC 60320-1.

3.42

power circuit

circuit that supplies power from the supply network to units of equipment used for productive operation and to transformers supplying control circuits

3.43

protective bonding

equipotential bonding for protection against electric shock

NOTE Measures for protection against electric shock can also reduce the risk of burns or fire.

3.44

protective bonding circuit

protective conductors and conductive parts connected together to provide protection against electric shock in the event of an insulation failure

3.45

protective conductor

conductor required for protective bonding by some measures for protection against electric shock for electrically connecting any of the following parts:

• exposed conductive parts;

• extraneous conductive parts;

• main earthing terminal (PE)

[IEV 826-13-22, modified]

3.46

redundancy

application of more than one device or system, or part of a device or system, with the objective of ensuring that in the event of one failing to perform its function, another is available to perform that function

3.47

reference designation

distinctive code which serves to identify an object in the documentation and on the equipment

note ???

3.48

risk

combination of the probability of occurrence of harm (i.e. physical injury or damage to health) and the severity of that harm

[ISO 12100-1, 3.11, modified]

3.49

safeguard

guard or protective device provided as a means to protect persons from a hazard

3.50

safeguarding

protective measure using safeguards to protect persons from the hazards which cannot reasonably be eliminated or from the risks which cannot be sufficiently reduced by inherently safe design measures

[ISO 12100-1, 3.20]

3.51

servicing level

level on which persons stand when operating or maintaining the electrical equipment

3.52

short-circuit current

overcurrent resulting from a short circuit due to a fault or an incorrect connection in an electric circuit

[IEV 441-11-07]

3.53

(electrically) skilled person

person with relevant training, education and experience to enable him or her to perceive risks and to avoid hazards associated with electricity

[IEV 826-18-01, modified]

3.54

supplier

entity (for example manufacturer, contractor, installer, integrator) who provides equipment or services associated with the machine

NOTE The user organization may also act in the capacity of a supplier to itself.

3.55

switching device

device designed to make and/or break the current in one or more electric circuits

[IEV 441-14-01, modified]

NOTE A switching device may perform one or both of these actions.

3.56

uncontrolled stop

stopping of machine motion by removing electrical power to the machine actuators

NOTE This definition does not imply any particular state of other stopping devices, for example mechanical or hydraulic brakes.

3.57

user

entity who utilizes the machine and its associated electrical equipment

4. General requirements

   1. General

This part of IEC 60204 is intended to apply to electrical equipment used with a wide variety of machines and with a group of machines working together in a co-ordinated manner.

The risks associated with the hazards relevant to the electrical equipment shall be assessed as part of the overall requirements for risk assessment of the machine. This will determine the adequate risk reduction, and the necessary protective measures for persons who can be exposed to those hazards, while still maintaining an acceptable level of performance of the machine and its equipment.

Hazardous situations can result from, but are not limited to, the following causes:

• failures or faults in the electrical equipment resulting in the possibility of electric shock or electrical fire;

• failures or faults in control circuits (or components and devices associated with those circuits) resulting in the malfunctioning of the machine;

• disturbances or disruptions in power sources as well as failures or faults in the power circuits resulting in the malfunctioning of the machine;

• loss of continuity of circuits that depend upon sliding or rolling contacts, resulting in a failure of a safety function;

• electrical disturbances for example, electromagnetic, electrostatic either from outside the electrical equipment or internally generated, resulting in the malfunctioning of the machine;

• release of stored energy (either electrical or mechanical) resulting in, for example, electric shock, unexpected movement that can cause injury;

• audible noise at levels that cause health problems to persons;

• surface temperatures that can cause injury.

Safety measures are a combination of the measures incorporated at the design stage and those measures required to be implemented by the user.

The design and development process shall identify hazards and the risks arising from them. Where the hazards cannot be removed and/or the risks cannot be sufficiently reduced by inherently safe design measures, protective measures (for example safeguarding,) shall be provided to reduce the risk. Additional means (for example, awareness means) shall be provided where further risk reduction is necessary. In addition, working procedures that reduce risk can be necessary.

The use of the enquiry form as shown in Annex В of this part of IEC 60204 is recommended in order to facilitate an appropriate agreement between the user and the supplier(s) on basic conditions and additional user specifications related to the electrical equipment. Those additional specifications are to:

• provide additional features that are dependent on the type of machine (or group of machines) and the application;

• facilitate maintenance and repair; and

• improve the reliability and ease of operation.

Electrical components and devices shall:

• be suitable for their intended use; and

• conform to relevant IEC standards where such exist; and

• be applied in accordance with the supplier’s instructions.

The electrical equipment of the machine shall satisfy the safety requirements identified by the risk assessment of the machine. Depending upon the machine, its intended use and its electrical equipment, the designer may select parts of the electrical equipment of the machine that are in compliance with relevant parts of the IEC 60439 series (see also Annex F).

NOTE The IEC 60439 series specifies requirements for equipment covering a wide range of possible applications of low-voltage switchgear and controlgear assemblies.

The electrical equipment shall be designed to operate correctly with the conditions of the supply:

• as specified in 4.3.2 or 4.3.3, or

• as otherwise specified by the user (see Annex B), or

• as specified by the supplier in the case of a special source of supply such as an on-board generator.

From converting equipment:

Voltage 0,9 to 1,1 of nominal voltage.

Voltage interruption Not exceeding 20 ms with more than 1 s between successive interruptions.

NOTE This is a variation to IEC Guide 106 to ensure proper operation of electronic equipment.

Ripple (peak-to-peak) Not exceeding 0,15 of nominal voltage.

For special supply systems such as on-board generators, the limits given in 4.3.2 and 4.3.3 may be exceeded provided that the equipment is designed to operate correctly with those conditions.

The electrical equipment shall be suitable for the physical environment and operating conditions of its intended use. The requirements of 4.4.2 to 4.4.8 cover the physical environment and operating conditions of the majority of machines covered by this part of IEC 60204. When special conditions apply or the limits specified are exceeded, an agreement between user and supplier (see 4.1) can be necessary.