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Rigid metal conduit and fittings shall be of galvanized steel or of a corrosion-resistant material suitable for the conditions. The use of dissimilar metals in contact that can cause galvanic action should be avoided.

Conduits shall be securely held in place and supported at each end.

Fittings shall be compatible with the conduit and appropriate for the application. Fittings shall be threaded unless structural difficulties prevent assembly. Where threadless fittings are used, the conduit shall be securely fastened to the equipment.

Conduit bends shall be made in such a manner that the conduit shall not be damaged and the internal diameter of the conduit shall not be effectively reduced.

A flexible metal conduit shall consist of a flexible metal tubing or woven wire armour. It shall be suitable for the expected physical environment.

Fittings shall be compatible with the conduit and appropriate for the application.

Flexible non-metallic conduit shall be resistant to kinking and shall have physical characteristics similar to those of the sheath of multiconductor cables.

The conduit shall be suitable for use in the expected physical environment.

Fittings shall be compatible with the conduit and appropriate for the application.

Cable trunking systems external to enclosures shall be rigidly supported and clear of all moving or contaminating portions of the machine.

Covers shall be shaped to overlap the sides; gaskets shall be permitted. Covers shall be attached to cable trunking systems by suitable means. On horizontal cable trunking systems, the cover shall not be on the bottom unless specifically designed for such installation.

NOTE Requirements for cable trunking and ducting systems for electrical installations are given in the IEC 61084 series.

Where the cable trunking system is furnished in sections, the joints between sections shall fit tightly but need not be gasketed.

The only openings permitted shall be those required for wiring or for drainage. Cable trunking systems shall not have opened but unused knockouts.

The use of compartments or cable trunking systems within the column or base of a machine to enclose conductors is permitted provided the compartments or cable trunking systems are isolated from coolant or oil reservoirs and are entirely enclosed. Conductors run in enclosed compartments and cable trunking systems shall be so secured and arranged that they are not subject to damage.

Connection boxes and other boxes used for wiring purposes shall be accessible for maintenance. Those boxes shall provide protection against the ingress of solid bodies and liquids, taking into account the external influences under which the machine is intended to operate (see 11.3).

Those boxes shall not have opened but unused knockouts nor any other openings and shall be so constructed as to exclude materials such as dust, flyings, oil, and coolant.

Motor connection boxes shall enclose only connections to the motor and motor-mounted devices (for example brakes, temperature sensors, plugging switches, tachometer generators).

13. Electric motors and associated equipment

    1. General requirements

Electric motors should conform to the relevant parts of IEC 60034 series.

The protection requirements for motors and associated equipment are given in 7.2 for overcurrent protection, in 7.3 for overload protection, and in 7.6 for overspeed protection.

As many controllers do not switch off the supply to a motor when it is at rest, care shall be taken to ensure compliance with the requirements of 5.3, 5.4, 5.5, 7.5, 7.6 and 9.4. Motor control equipment shall be located and mounted in accordance with Clause 11.

It is recommended that motor enclosures be chosen from those included in IEC 60034-5.

The degree of protection shall be at least IP23 (see IEC 60529) for all motors. More stringent requirements can be needed depending on the application and the physical environment (see 4.4). Motors incorporated as an integral part of the machine shall be so mounted that they are adequately protected from mechanical damage.

As far as is practicable, the dimensions of motors shall conform to those given in the IEC 60072 series.

Each motor and its associated couplings, belts, pulleys, or chains, shall be so mounted that they are adequately protected and are easily accessible for inspection, maintenance, adjustment and alignment, lubrication, and replacement. The motor mounting arrangement shall be such that all motor hold-down means can be removed and all terminal boxes are accessible.

Motors shall be so mounted that proper cooling is ensured and the temperature rise remains within the limits of the insulation class (see IEC 60034-1).

Where practicable, motor compartments should be clean and dry, and when required, shall be ventilated directly to the exterior of the machine. The vents shall be such that ingress of swarf, dust, or water spray is at an acceptable level.

There shall be no opening between the motor compartment and any other compartment that does not meet the motor compartment requirements. Where a conduit or pipe is run into the motor compartment from another compartment not meeting the motor compartment requirements, any clearance around the conduit or pipe shall be sealed.

The characteristics of motors and associated equipment shall be selected in accordance with the anticipated service and physical environmental conditions (see 4.4). In this respect, the points that shall be considered include:

• type of motor;

• type of duty cycle (see IEC 60034-1);

• fixed speed or variable speed operation, (and the consequent variable influence of the ventilation);

• mechanical vibration;

• type of motor control;

• influence of the harmonic spectrum of the voltage and/or current feeding the motor (particularly when it is supplied from a static convertor) on the temperature rise;

• method of starting and the possible influence of the inrush current on the operation of other users of the same power supply, taking also into account possible special considerations stipulated by the supply authority;

• variation of counter-torque load with time and speed;

• influence of loads with large inertia;

• influence of constant torque or constant power operation;

• possible need of inductive reactors between motor and converter.

Operation of the overload and overcurrent protective devices for mechanical brake actuators shall initiate the simultaneous de-energization (release) of the associated machine actuators.

NOTE Associated machine actuators are those associated with the same motion, for example cable drums and long-travel drives.

13. Accessories and lighting

    1. Accessories

Where the machine or its associated equipment is provided with socket-outlets that are intended to be used for accessory equipment (for example hand-held power tools, test equipment), the following apply:

• the socket-outlets should conform to IEC 60309-1. Where that is not practicable, they should be clearly marked with the voltage and current ratings;

• the continuity of the protective bonding circuit to the socket-outlet shall be ensured except where protection is provided by PELV;

• all unearthed conductors connected to the socket-outlet shall be protected against overcurrent and, when required, against overload in accordance with 7.2 and 7.3 separately from the protection of other circuits;

• where the power supply to the socket-outlet is not disconnected by the supply disconnecting device for the machine or the section of the machine, the requirements of 5.3.5 apply.

NOTE 1 See also Annex B.

NOTE 2 Circuits for socket-outlets can be provided with residual current protective devices (RCDs).

Connections to the protective bonding circuit shall be in accordance with 8.2.2.

The ON/OFF switch shall not be incorporated in the lampholder or in the flexible connecting cords.

Stroboscopic effects from lights shall be avoided by the selection of appropriate luminaires.

Where fixed lighting is provided in an enclosure, electromagnetic compatibility should be taken into account using the principles outlined in 4.4.2.

The nominal voltage of the local lighting circuit shall not exceed 250 V between conductors. A voltage not exceeding 50 V between conductors is recommended.

Lighting circuits shall be supplied from one of the following sources (see also 7.2.6):

• a dedicated isolating transformer connected to the load side of the supply disconnecting device. Overcurrent protection shall be provided in the secondary circuit;

• a dedicated isolating transformer connected to the line side of the supply disconnecting device. That source shall be permitted for maintenance lighting circuits in control enclosures only. Overcurrent protection shall be provided in the secondary circuit (see also 5.3.5 and 13.1.3);

• a machine circuit with dedicated overcurrent protection;

• an isolating transformer connected to the line side of the supply disconnecting device, provided with a dedicated primary disconnecting means (see 5.3.5) and secondary overcurrent protection, and mounted within the control enclosure adjacent to the supply disconnecting device (see also 13.1.3);

• an externally supplied lighting circuit (for example factory lighting supply). This shall be permitted in control enclosures only, and for the machine work light(s) where their total power rating is not more than 3 kW.

Exception: where fixed lighting is out of reach of operators during normal operations, the provisions of this Subclause do not apply.

Local lighting circuits shall be protected in accordance with 7.2.6.

Adjustable lighting fittings shall be suitable for the physical environment.

The lampholders shall be:

• in accordance with the relevant IEC standard;

• constructed with an insulating material protecting the lamp cap so as to prevent unintentional contact.

Reflectors shall be supported by a bracket and not by the lampholder.

Exception: where fixed lighting is out of reach of operators during normal operation, the provisions of this Subclause do not apply.

13. Marking, warning signs and reference designations

    1. General

Warning signs, nameplates, markings, and identification plates shall be of sufficient durability to withstand the physical environment involved.

Enclosures that do not otherwise clearly show that they contain electrical equipment that can give rise to a risk of electric shock shall be marked with the graphical symbol IEC 60417-5036 (DB:2002-10).

The warning sign shall be plainly visible on the enclosure door or cover.

The warning sign may be omitted (see also 6.2.2 b)) for:

• an enclosure equipped with a supply disconnecting device;

• an operator-machine interface or control station;

• a single device with its own enclosure (for example position sensor).

Where the risk assessment shows the need to warn against the possibility of hazardous surface temperatures of the electrical equipment, the graphical symbol IEC 60417-5041 (DB:2002-10) shall be used.

NOTE For electrical installations, this measure is dealt with in IEC 60364-4-42, Clause 423 and Table 42A.

Control devices, visual indicators, and displays (particularly those related to safety) shall be clearly and durably marked with regard to their functions either on or adjacent to the item. Such markings may be as agreed between the user and the supplier of the equipment (see Annex B). Preference should be given to the use of standard symbols given in IEC 60417- DB:2002 and ISO 7000.

Equipment (for example controlgear assemblies) shall be legibly and durably marked in a way that is plainly visible after the equipment is installed. A nameplate giving the following information shall be attached to the enclosure adjacent to each incoming supply:

• name or trade mark of supplier;

• certification mark, when required;

• serial number, where applicable;

• rated voltage, number of phases and frequency (if a.c.), and full-load current for each supply;

• short-circuit rating of the equipment;

• main document number (see IEC 62023).

The full-load current shown on the nameplate shall be not less than the running currents for all motors and other equipment that can be in operation at the same time under normal conditions.

Where only a single motor controller is used, that information may instead be provided on the machine nameplate where it is plainly visible.

All enclosures, assemblies, control devices, and components shall be plainly identified with the same reference designation as shown in the technical documentation.

13. Technical documentation

    1. General

The information necessary for installation, operation, and maintenance of the electrical equipment of a machine shall be supplied in the appropriate forms, for example, drawings, diagrams, charts, tables, instructions. The information shall be in an agreed language (see also Annex B). The information provided may vary with the complexity of the electrical equipment. For very simple equipment, the relevant information may be contained in one document, provided that the document shows all the devices of the electrical equipment and enables the connections to the supply network to be made.

NOTE 1 The technical documentation provided with items of electrical equipment can form part of the documentation of the electrical equipment of the machine.

NOTE 2 In some countries, the requirement to use specific language(s) is covered by legal requirements.

The information provided with the electrical equipment shall include:

1. A main document (parts list or list of documents);

2. Complementary documents including:

1. a clear, comprehensive description of the equipment, installation and mounting, and the connection to the electrical supply(ies);

2. electrical supply(ies) requirements;

3. information on the physical environment (for example lighting, vibration, noise levels, atmospheric contaminants) where appropriate;

4. overview (block) diagram(s) where appropriate;

5. circuit diagram(s);

6. information (as applicable) on:

• programming, as necessary for use of the equipment;

• sequence of operation(s);

• frequency of inspection;

• frequency and method of functional testing;

• guidance on the adjustment, maintenance, and repair, particularly of the protective devices and circuits;

• recommended spare parts list; and

• list of tools supplied.

7. a description (including interconnection diagrams) of the safeguards, interlocking functions, and interlocking of guards against hazards, particularly for machines operating in a co-ordinated manner;

8. a description of the safeguarding and of the means provided where it is necessary to suspend the safeguarding (for example for setting or maintenance), (see 9.2.4);

9. instructions on the procedures for securing the machine for safe maintenance; (see also 17.8);

10. information on handling, transportation and storage;

11. information regarding load currents, peak starting currents and permitted voltage drops, as applicable;

12. information on the residual risks due to the protection measures adopted, indication of whether any particular training is required and specification of any necessary personal protective equipment.

Unless otherwise agreed between manufacturer and user:

• the documentation shall be in accordance with relevant parts of IEC 61082;

• reference designations shall be in accordance with relevant parts of IEC 61346;

• instructions/manuals shall be in accordance with IEC 62079.

• parts lists where provided shall be in accordance with IEC 62027, class B.

NOTE See item 13 of Annex B.

For referencing of the different documents, the supplier shall select one of the following methods:

• where the documentation consists of a small number of documents (for example less than 5) each of the documents shall carry as a cross-reference the document numbers of all other documents belonging to the electrical equipment; or

• for single level main documents only (see IEC 62023), all documents shall be listed with document numbers and titles in a drawing or document list; or

• all documents of a certain level (see IEC 62023) of the document structure shall be listed, with document numbers and titles, in a parts list belonging to the same level.

The installation documents shall give all information necessary for the preliminary work of setting up the machine (including commissioning). In complex cases, it may be necessary to refer to the assembly drawings for details.

The recommended position, type, and cross-sectional areas of the supply cables to be installed on site shall be clearly indicated.

The data necessary for choosing the type, characteristics, rated currents, and setting of the overcurrent protective device(s) for the supply conductors to the electrical equipment of the machine shall be stated (see 7.2.2).

Where necessary, the size, purpose, and location of any ducts in the foundation that are to be provided by the user shall be detailed (see Annex B).

The size, type, and purpose of ducts, cable trays, or cable supports between the machine and the associated equipment that are to be provided by the user shall be detailed (see Annex B).

Where necessary, the diagram shall indicate where space is required for the removal or servicing of the electrical equipment.

NOTE 1 Examples of installation diagrams can be found in IEC 61082-4.

In addition, where it is appropriate, an interconnection diagram or table shall be provided. That diagram or table shall give full information about all external connections. Where the electrical equipment is intended to be operated from more than one source of electrical supply, the interconnection diagram or table shall indicate the modifications or interconnections required for the use of each supply.

NOTE 2 Examples of interconnection diagrams/tables can be found in IEC 61082-3.

Where it is necessary to facilitate the understanding of the principles of operation, an overview diagram shall be provided. An overview diagram symbolically represents the electrical equipment together with its functional interrelationships without necessarily showing all of the interconnections.

NOTE 1 Examples of overview diagrams can be found in IEC 61082 series.

Function diagrams may be provided as either part of, or in addition to, the overview diagram.

NOTE 2 Examples of function diagrams can be found in IEC 61082-2.

A circuit diagram(s) shall be provided. This diagram(s) shall show the electrical circuits on the machine and its associated electrical equipment. Any graphical symbol not shown in IEC 60617-DB:2001 shall be separately shown and described on the diagrams or supporting documents. The symbols and identification of components and devices shall be consistent throughout all documents and on the machine.

Where appropriate, a diagram showing the terminals for interface connections shall be provided. That diagram may be used in conjunction with the circuit diagram(s) for simplification. The diagram should contain a reference to the detailed circuit diagram of each unit shown.

Switch symbols shall be shown on the electromechanical diagrams with all supplies turned off (for example electricity, air, water, lubricant) and with the machine and its electrical equipment ready for a normal start.

Conductors shall be identified in accordance with 13.2.

Circuits shall be shown in such a way as to facilitate the understanding of their function as well as maintenance and fault location. Characteristics relating to the function of the control devices and components which are not evident from their symbolic representation shall be included on the diagrams adjacent to the symbol or referenced to a footnote.

The technical documentation shall contain an operating manual detailing proper procedures for set-up and use of the electrical equipment. Particular attention should be given to the safety measures provided.