IEC TS 62966-3:2021 pdf download – Mechanical structures for electrical and electronic equipment – Aisle containment for it cabinets – Part 3: Aspects of operational and personal safety.
3.8 lead time time between the alarm signal and the release of the extinguishing medium 3.9 aspirating smoke detector ASD high-sensitivity detector, which consists of a central detection unit, that draws air through a system of pipes to detect smoke Note 1 to entry: The sampling chamber is based on a nephelometer, that detects the presence of smoke particles suspended in air by detecting the light scatterd by them in the chamber. In most cases aspirating smoke detectors require a fan unit to draw in a sample of air from the monitored area through its system of pipes. 3.1 0 delay device device that is part of a fire-fighting installation designed to ensure that flooding does not take place until the fire alarm devices have been activated and the specified lead time has expired 3.1 1 extinguishing gas concentration value for the concentration of extinguishing gas present in the atmosphere of the area being flooded expressed as % vol 3.1 2 qualified person defined as a person who, by possession of a recognized degree, certificate, or professional standing, or who by extensive knowledge, training and experience, has successfully demonstrated his/her ability to solve or resolve problems relating to the subject matter, the work, or the project 3.1 3 hazard area containment area plus any adjacent areas that will be flooded with the extinguishing gas
4.2.2 Functional aspects of escape doors It is recommended that any manually operated doors that are defined as emergency exits or will be used in emergency situations are to open in the escape direction. The opening direction of any other doors situated along escape routes depends on the result of a risk assessment to be carried out on a case-by-case basis taking local and operational factors into account, in particular – the potential hazard situation; – the number of persons who will be obliged to use an escape route at the same time; – and the type of personnel that depends on the usability of the doors. The use of revolving or sliding doors that are operated purely manually is to be considered in light of local directives or to be the subject of a risk assessment. Doors that close automatically may only be employed in corridors/escape routes that are exposed to the risk of fire if they comply with building standards. All doors situated along an escape route and/or emergency exit shall, in the event that personnel have to rely on being able to use the escape route, open easily without having to resort to any special equipment. The opening mechanism shall be instantly recognisable and easily accessible. Lockable doors located along an escape route shall open easily from inside and outside (for rescue personnel) without having to resort to any special equipment. Where locking systems are being used, an Emergency Open button shall be provided to enable the door to be opened easily without having to resort to any special equipment. An electrical locking system shall also unlock itself automatically in the event of a power failure.
4.2.4 Escape and evacuation plan Escape route plans that take account of the applicable national regulations and include the containments, assuming the (enclosed) cold or hot aisle is defined as an escape route or would have to be used as such in an emergency situation, are to be produced. A containment as an accessible equipment and no fix part of a building, can change its appearance, design or position within the building in dependence of the current use. Consequently each change of form of the containment results in a new escape or evacuation situation within the containment. These changes shall be considered to adapt to the existing escape and evacuation plan of the surrounding data centre.