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SAFETY OF SMALL POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-8: PARTICULAR REQUIREMENTS FOR BELL AND CHIME TRANSFORMERS (IEC 61558-2-8:1998, IDT)
MS IEC 61558-2-8:2007
Status : Original
Format : PDF

This Malaysian Standard deals with all aspects of safety such as electrical, thermal and mechanical. 
This standard applies to fixed, single-phase, air-cooled (natural or forced), indépendant ....Read more or associated safety isolating transformers for bell and chimes, having a rated supply voltage not exceeding 250 V a.c., a rated frequency not exceeding 500 Hz, a rated output not exceeding 100 VA. The no-load output voltage shall not exceed 33 V a.c. or 46 V ripple free d.c. and the rated
output voltage shall not exceed 24 V a.c. or 33 V ripple free d.c.

Bell and chime transformers are generally intended to supply domestic sound signalling equipment and other similar devices where the load is applied for short periods of time.

NOTE 1 – A partial load may be applied for illumination purposes.

This standard applies to special safety isolating transformers (transformer for bell and chime) which are used where double or reinforced insulation between circuits is required by the installation rul Close

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SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-1: PARTICULAR REQUIREMENTS FOR SEPARATING TRANSFORMERS FOR GENERAL USE (IEC 61558-2-1:1997, IDT)
MS IEC 61558-2-1:2005
Status : Original
Format : PDF

This Malaysian Standard applies to stationary or portable, single-phase or polyphase, aircooled separating transformers, associated or not, having a rated supply voltage not exceeding 1000 V a.c., a ....Read more rated frequency not exceeding 500 Hz, and a rated output not exceeding:
– 1 kVA for single-phase transformers;
– 5 kVA for polyphase transformers.

This Malaysian Standard is also applicable to separating transformers having a rating up to 40 kVA, however such transformers are considered as special transformers and are subjected to an agreement between the purchaser and the supplier. The no-load output voltage or the rated output voltage shall not exceed 1000 V a.c. or 1415 V ripple-free d.c.

This standard applies to transformers where double or reinforced insulation between circuits is not required by the installation rules or by the appliance specification.

NOTE:
1.Normally, the transformers are intended to be associated with equipment to provide voltages different from the supply Close

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SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 1: GENERAL REQUIREMENTS AND TESTS (IEC 61558-1:1998, IDT)
MS IEC 61558-1:2005
Status : Original
Format : PDF

This Malaysian Standard provides general specifications for all aspects of safety (such as electrical, thermal and mechanical) of: a) Stationary or portable, single-phase or polyphase, air-cooled (nat ....Read more ural or forced) isolating and safety isolating transformers; and b) Stationary or portable, single-phase or polyphase, air-cooled (natural or forced) separating transformers, auto-transformers, variable transformers and small reactors. Close

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SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-6: PARTICULAR REQUIREMENTS FOR SAFETY ISOLATING TRANSFORMERS FOR GENERAL USE (IEC 61558-2-6:1997, IDT)
MS IEC 61558-2-6:2005
Status : Original
Format : PDF

This Malaysian Standard applies to stationary or portable, single-phase or polyphase, air-cooled safety isolating transformers, associated or otherwise, having a rated supply voltage not exceeding 100 ....Read more 0 V a.c. and rated frequency not exceeding 500 Hz, the rated output not exceeding: 

- 10 kVA for single-phase transformers;
- 16 kVA for polyphase transformers. Close

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SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-5: PARTICULAR REQUIREMENTS FOR SHAVER TRANSFORMERS AND SHAVER SUPPLY UNITS
MS IEC 61558-2-5:2005
Status : Original
Format : PDF

This Malaysian Standard applies to shaver supply units, embodying one or more socket-outlets and a single phase air cooled isolating transformer, having a rated supply voltage not exceeding 250 V a.c. ....Read more , a rated output not less than 20 VA and not exceeding 50 VA, a rated output voltage not exceeding 250 V, and a rated frequency not exceeding 500 Hz.

This Malaysian Standard is also applicable to shaver transformers for embodiment into shaver supply
units.

NOTE 1 – Shaver supply units may be flush or surface mounted or incorporated in luminaires and other
equipment.

NOTE 2 – Shaver supply units may be used to supply shavers, tooth brushes and similar small power devices.  Close

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SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-4: PARTICULAR REQUIREMENTS FOR ISOLATING TRANSFORMERS FOR GENERAL USE (IEC 61558-2-4:1997, IDT)
MS IEC 61558-2-4:2005
Status : Original
Format : PDF

This Malaysian Standard applies to stationary or portable, single-phase or polyphase, air-cooled isolating transformers, associated or otherwise, having a rated supply voltage not exceeding 1000 V a ....Read more .c. and rated frequency not exceeding 500 Hz, the rated output not exceeding:

– 25 kVA for single-phase transformers;
– 40 kVA for polyphase transformers.

This standard is also applicable to isolating transformers without limitation of the rated output, however such transformers are considered as special transformers and are subjected to an agreement between the purchaser and the supplier. The no-load output voltage or the rated output voltage does not exceed 500 V a.c. or 708 V ripple-free d.c.

NOTES

1. The no-load output voltage or the rated output voltage may be up to 1000 V a.c. or 1 415 V ripple-free d.c. to be in accordance with the national wiring rules or for a special purpose.
2. This standard is applicable to those isolating transformers used when the installation rules ca Close

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SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS AND SIMILAR - PART 2-17: PARTICULAR REQUIREMENTS FOR TRANSFORMERS FOR SWITCH MODE POWER SUPPLIES (IEC 61558-2-17:1997, IDT)
MS IEC 61558-2-17:2007
Status : Original
Format : PDF

This Malaysian Standard applies to associated power transformers for switch mode power supplies, single-phase or polyphase, air-cooled: 

– separating transformers;
– isolating ....Read more transformers;
– safety isolating transformers,

having a rated supply voltage not exceeding 1000 V a.c. and a rated frequency of 500 Hz to 1 MHz, the rated output not exceeding:
– 10 kVA for single-phase transformers;
– 16 kVA for polyphase transformers.
NOTE 1 – For higher frequencies, this standard may be used as a guide.

The no-load output voltage or the rated output voltage do not exceed:
– 1000 V a.c. or 1 415 V ripple-free d.c for separating transformers;
– 500 V a.c. or 708 V ripple-free d.c for isolating transformers.
NOTE 2 – For isolating transformers, the rated output voltage may be up to 1000 V a.c. or 1415 V ripple-free d.c. in accordance with the national wiring rules or designed for special purposes.
– 50 V a.c. r.m.s. and/or 120 V ripple-free d.c for safety isolating transformers.

T Close

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Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 8: Insulation monitoring devices for IT systems (IEC 61557-8:2007, IDT)
MS IEC 61557-8:2012
Status : Original
Format : PDF

This Malaysian Standard 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. system ....Read more s 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 measuring. Close

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RESIDUAL CURRENT-OPERATED PROTECTIVE DEVICES (RCDS) FOR HOUSEHOLD AND SIMILAR USE - ELECTROMAGNETIC COMPATIBILITY (IEC 61543:1995, IDT)
MS IEC 61543:2008 (CONFIRMED:2011)
Status : 1st Confirmation
Format : PDF

This Malaysian Standard ensures electromagnetic compatibility of devices providing residual current protection, for rated voltages not exceeding 440 V a.c. intended principally for protection of perso ....Read more ns against shock hazards. Close

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ELECTRICAL ACCESSORIES - PORTABLE RESIDUAL CURRENT DEVICES WITHOUT INTEGRAL OVERCURRENT PROTECTION FOR HOUSEHOLD AND SIMILAR USE (PRCDS) (IEC 61540:1999, IDT)
MS IEC 61540:2008
Status : Original
Format : PDF

This Malaysian Standard applies to portable devices consisting of a plug, a residual current device (RCD) and one or more socket-outlets or a provision for connection. They do not incorporate overcurr ....Read more ent protection. They are intended for single-phase circuits for rated currents not exceeding 16 A for rated voltages not exceeding 250 V a.c. or for rated current not exceeding 32 A for rated voltages not exceeding 130 V a.c. to earth. Close

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