BS 6182-1:1994

This standard BS 6182-1:1994 Intriniscally safe power supplies for use in coal mines is classified in these ICS categories:

• 29.260.20 Electrical apparatus for explosive atmospheres

This Part of BS 6182 specifies requirements for the construction and testing of a range of power supply units intended to be certified intrinsically safe for use in coal mines and which provide an intrinsically safe d.c. output as follows:

1. an 18 DC type power supply provides a nominal 18 V output that may be used, for example, to float charge an intrinsically safe battery with a nominal discharge end-point voltage of 12 V;
2. a 12 DC type power supply provides a nominal 12 V output for use where battery standby is not required, or to float charge an intrinsically safe battery with a nominal discharge end-point voltage of 7.5 V;
3. a 7.5 DC type power supply provides a nominal 7.5 V output that may be used, for example, with equipment using logic circuits requiring 5 V for operation.

It is intended that the components forming the power supply circuit be assembled on to a chassis that may be incorporated within either a flameproof enclosure or, where the power supply is located outside a potentially explosive atmosphere, within some other suitable enclosure. Requirements for these enclosures are not given in this standard. Guidance on interconnection with other apparatus is given in Annex A.

In addition to the definitive requirements, this standard also requires the information detailed in clause 4 to be documented. For compliance with this standard, both the definitive requirements and the documented item has to be satisfied.

Specifies construction and testing of mains-input intrinsically safe 18 V, 12 V and 7.5 V d.c. output power supplies.