Standards of ASD
Transcript of Standards of ASD
Standards:
By and large, safety related product aspects regulate the import and 3 installation of
electrical equipment. The basic premise is: The safety and health of direct users or third parties
cannot be compromised and endangered by the manner in which the equipment is meant to be
operated, nor should any anticipated mis-application of the product be overlooked in its design and
in the end-use for which it is intended.
The basis of safety standards with respect to electrical equipment is safeguarding against
potential life threatening dangers such as:
• Electrical shocks involving exposure to dangerous voltage levels,
• Fires resulting from abnormally high temperatures,
• Bodily injuries related to moving parts, sharp edges, unstable assemblies, hot surfaces,
• Chemical hazards emanating from unintended release of health injurious materials
• Exposure to radiation
Thus, the safety standards see to it that established engineering principles and sound
protective requirements are put in place:
• Suitably designed and dimensioned electrical energy distribution networks.
• Protection against indirect contact with live parts,
• Fundamentally sound equipment design criteria and appropriate construction materials,
• Provisions against radiation exposure.
The electrical and constructive safety aspects of adjustable speed drive systems are
established by conformity with the product standards IEC 61800-5-1 (Adjustable speed electrical
power drive systems – Part 5-1: Safety requirements – Electrical, thermal and energy) and UL508C
(Power Conversion Equipment). UL/IEC 61800-5-1, a planned harmonized version of both
documents, will help establish a uniform and globally accepted standard for the future
The IEC publishes global standards in which the minimum safety requirements for electrical
equipment are established. The technical details and constructive solutions to meet these
requirements are the responsibility of the manufacturer.
The CE-Mark placed on equipment and its packaging provides verification of its conformity
with the relevant IEC standards. The mark enables unimpeded access of this equipment in markets
throughout the European economical community (EEA = European Economic Area). The
manufacturer must provide to this effect a Declaration of Conformity, which serves as confirmation
that all of the requirements pertaining to the product under its assigned directive have been met in
full.
Reference: AC Variable speed drive systems for the North American market, Eaton Corporation
Electrical Sector – EMEA, Eaton Industries GmbH
REFERENCED NEMA STANDARDS:
1. MG1-1998 Motors and Generators
Part 30 Application Considerations For Constant Speed Motors Used On A Sinusoidal Bus
With Harmonic Content And General Purpose Motors Used With Adjustable - Voltage Or
Adjustable - Frequency Controls Or Both provides information for NEMA Design A and B
motors that are covered in MG1 Part 12 Test and Performance—AC and DC Motors and Part
20 Large Machines—Induction Motors, when used with adjustable voltage or frequency
controls, as indicated in the Scope of Part 30. It also defines terms, performance
considerations, and sets limits for which these general-purpose motors are suitable for
operation.
Part 31 Definite-Purpose Inverter-Fed Motors defines a definite-purpose motor specifically
designed for operation with adjustable frequency controls. Part 31 gives the minimum
performance standards that apply to this type of motor.
2. ICS 7 -1993 Industrial Control and Systems Adjustable-Speed Drives
NEMA Standards Publication ICS 7 provides practical information concerning ratings,
construction, test, performance and manufacture of industrial control equipment. These
standards are used by the electrical industry to provide guidelines for the manufacture and
proper application of reliable products and equipment and to promote the benefits of
repetitive manufacturing and widespread product availability.
3.
ICS 7.1-1995 Safety Standards for Construction and Guide for Selection, Installation, and
Operation of Adjustable Speed Drive Systems
NEMA Standards Publication ICS 7.1 defines the construction and test requirements for
adjustable-speed drive systems. It also provides recommendations for their selection,
installation and operation in such a manner as to provide for the practical safeguarding of
persons.
4.
NEMA 250-1996 Enclosures for Electrical Equipment (1000 Volts Maximum)
NEMA Standards Publication 250 covers enclosures for electrical equipment rated not more
than 1000 volts. It provides descriptions, features, and test criteria for hazardous (classified)
locations and non-hazardous location enclosures.