For e , it is permitted to protect a circuit by earthing a part other than the protected circuit itself, for example, the secondary winding of a transformer supplying the protected circuit. A test on a layer or group of layers is not repeated on an identical layer or group. The scratches shall be at least 5 mm apart and at least 5 mm from the edge of the specimen. Part 5 mechanical properties. Fixed capacitors for electromagnetic interference suppression and connection to the supply mains lEC
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All USER access doors and covers that, if opened, would allow access to higher emissions than those permitted above shall be marked with one of the following see also 1.
NOTE 2 Requirements for overcurrent protection are given in 3. For equipment requiring a neutral connection to an IT power distribution system, the disconnect device shall be a four-pole device and shall disconnect all line conductors and the neutral conductor. To minimize testing time, the failure is chosen that causes the highest charging current. Additionally, one sample shall pass the test of 2.
Normally, this is achieved by having components and subassemblies adequately enclosed by enveloping or hermetic sealing so as to exclude dust and moisture see 2. NOTE 2 Conductive parts of an interconnecting cable may be part of a tnv circuit as stated in 1. The relationship between mains transient voltage and ac mains supply voltage is given in Table 2J. These tests are conducted on a completed assembly including the component s.
It shall be subjected to the applicable tests of this standard, as part of the equipment, and to the applicable tests of the component standard, under the conditions occurring in 20100 equipment; NOTE The applicable test for compliance with a component standard is, in general, conducted separately.
NOTE 4 The limits of 2. Compliance is checked by inspection and measurement and, if necessary, by tests. If two layers are used, each layer shall pass the test. This standard is intended to reduce such risks with respect to installed equipment, whether it consists of a system of interconnected units or independent units, subject to installing, operating and maintaining the equipment in the manner prescribed by the manufacturer.
During operations performed by a service person, the stabilizing means, if needed, shall either be automatic in operation, or a marking shall be provided to instruct the service PERSON to deploy the stabilizing means.
The transient voltage across the clearance is measured using the following test procedure. Observation is continued until stable conditions have existed for at least 5 s.
Except as required by 2. Bare parts at hazardous voltages shall be located or guarded so that unintentional contact with such parts is unlikely during service operations involving other parts of the equipment.
Only the circuits in the equipment are so classified. Equipment to be connected to any supply, including IT power distribution systems and supplies with reversible plugs, except for case C below Earth faults 2 Both conductors Overcurrent 1 Either of the two conductors Case C: Natural rubber, hygroscopic materials and materials containing asbestos shall not be used as insulation.
India BIS Compulsory Registration Scheme – Standard Update | Industries | UL
The 1352 is not applied to the following: The operating instructions, and the installation instructions for pluggable equipment intended for USER 1252, shall be made available to the user. If beads are located inside flexible metal conduits, they shall be contained within an insulating sleeve, unless the conduit is mounted or secured in such a way that movement in normal use would not create a hazard. For insulation between two adjacent winding wires, one layer on each conductor is considered to provide supplementary insulation.
This leakage current 1325 a permanent and continuously increasing temperature stress, which can cause the VDR to burn or burst. A limited power source operated from an AC mains supply, or a battery-operated limited power source that is recharged from an AC mains supply while supplying the load, shall incorporate an 22010 transformer. Examples of constructions regarded as meeting the requirements include: Markings and indications for switches and other controls shall be located either: Damp heat, steady state IS Part 4: However, flexing tests need be applied only to screened power supply cords for movable equipment.
The coating process, the coating material and the base material shall be such that uniform quality is assured and the separation distances under consideration are effectively protected.
India BIS Compulsory Registration Scheme – Standard Update
This can be done by, for example, locating parts that need to be accessible for servicing away from electrical and mechanical hazards, providing shields to avoid accidental contact with hazardous parts, and providing labels or instructions to warn personnel about any residual risk. However, where the cord anchorage is a bushing that includes the electrical connection to the screen of a screened power cord, this requirement ia not apply.
NOTE 1 Special precautions may be necessary, for example, for connection of the equipment to the supply and for the interconnection of separate units, if any. NOTE 2 The consequences of the circuit possibly being earthed at par second point, for example, by connection to other equipment, should be considered.