Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - AC semiconductor ...
Applies to controllers and starters, which may include a series mechanical switching device, intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. The contents of the corrigendum of March 2002 have been included in this copy. This consolidated version consists of the second edition (1999), its amendment 1 (2001) and its amendment 2 (2006). Therefore, no…
Calculation of d.c. resistance of plain and coated copper conductors of low-frequency cables and wir...
applies to low-frequency cables and wires for telecommunication and gives a general method for calculating the resistance of copper conductors. includes the following significant technical change with respect to the previous edition: improvement of the calculation method of the resistance of copper conductors. The contents of the corrigendum of February 2012 have been included in this copy.
Animal and vegetable fats and oils — Determination of insoluble impurities content
ISO 663:2007 specifies a method for the determination of the insoluble impurities content of animal and vegetable fats and oils.
If it is not desired to include soaps (particularly calcium soaps) or oxidized fatty acids in the insoluble impurities content, it is necessary to use a different solvent and procedure.
Direct reduced iron and hot briquetted iron — Sampling and sample preparation
ISO 10835:2007 gives
the underlying theory,the basic principles for sampling and preparation of samples, andthe basic requirements for the design, installation and operation of sampling systems,
for mechanical sampling, manual sampling and preparation of samples taken from a lot under transfer, to determine the chemical composition, moisture content and physical properties of the lot.
The…
Rubber compounding ingredients — Carbon black — Determination of sulfur content
ISO 1138:2007 specifies three methods for the determination of the total sulfur in all types of carbon black for use in the rubber industry:
Method A, using an oxygen bomb calorimeter;
Method B, using a combustion furnace;
Method C, using an automatic analyser.
With respect to safety aspects and test precision, it is preferable to use automatic systems. Classical chemical analysis (Method A…
Metallic powders — Test method for the determination of non-metallic inclusions in metal powders usi...
ISO 13947:2007 specifies a metallographic method for determining the non-metallic inclusion level in metal powders using a powder-forged specimen. The test method covers repress powder-forged test specimens in which there has been minimal lateral flow (< 1 %). The core region of the powder-forged test specimen contains no porosity detectable at 100X magnification.
This test method can also be…
Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - AC semiconductor ...
This part of IEC 60947 applies to a.c. semiconductor non-motor load controllers and contactors intended for performing electrical operations by changing the state of a.c. electric circuits between the ON-state and the OFF-state. Typical applications are given in table 2. This standard shall be used in conjunction with IEC 60947-1. A vertical line in the margin shows where the base publication has…
Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipmen...
This part of IEC 61557 specifies the requirements for insulation monitoring devices (IMD) which permanently monitor the insulation resistance to earth of unearthed IT a.c. systems, for IT a.c. systems with galvanically connected d.c. circuits having nominal voltages up to 1 000 V a.c., as well as of unearthed IT d.c. systems with voltages up to 1 500 V d.c. independent from the method of…
Information technology - MPEG audio technologies - Part 1: MPEG Surround
ISO/IEC 23003-1:2007 (MPEG Surround) is efficient technology for multi-channel audio compression. Rather than performing a discrete coding of the individual audio input channels, MPEG Surround captures the spatial image of a multi-channel audio signal into a compact set of parameters that are used to synthesize a high quality multi-channel representation from a transmitted downmix signal. MPEG…
Information technology — MPEG audio technologies — Part 1: MPEG Surround
ISO/IEC 23003-1:2007 (MPEG Surround) is efficient technology for multi-channel audio compression. Rather than performing a discrete coding of the individual audio input channels, MPEG Surround captures the spatial image of a multi-channel audio signal into a compact set of parameters that are used to synthesize a high quality multi-channel representation from a transmitted downmix signal. MPEG…
