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CAN/CSA-E79-5-95 (R1999):1995 Edition

CAN/CSA-E79-5-95 (R1999):1995 Edition

$41.60

Electrical Apparatus for Explosive Gas Atmospheres – Part 5: Sand-Filled Apparatus

Published By Publication Date Number of Pages
CSA 1995 40
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1. General

1.1  Principle

Protection of electrical apparatus by sand-filling is obtained by filling the enclosure with a material having the consistency of sand, in such a way that if, under the conditions of use for which the apparatus has been designed, an arc occurs within the enclosure, this arc will not be liable to ignite the outer explosive atmosphere. No ignition should be caused either by the transmission of flame or by the overheating of the walls of the e nclosure.

1.2  Object

The object of this Recommendation is to prescribe:
(1) The constructional requirements to be met by:
(a) enclosures of electrical apparatus;
(b) filling materials.

(2) The tests to be made to check compliance with these requirements.
(3) The method of determining the minimum safety height.
(4) The marking of enclosures.

This Recommendation does not deal with the conditions of installation of apparatus nor with the precautions to be taken to ensure that it is used within the limits of voltage, power and short-circuit current for which it has been designed.

This Recommendation does not specify any limit of temperature rise to take into account the danger of direct ignition of certain gases or vapours, arising from their contact with the outer surface of the enclosure and from its temperature.*.

*The danger of ignition by hot surfaces is a common feature of all protection problems. It is under consideration.

Scope

The method of protection by sand-filling applies only to electrical apparatus, or parts thereof, which have no moving parts in direct contact with the filling material and which in addition comply with the relevant IEC Recommendations. /

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CAN/CSA-E79-5-95 (R1999)
$41.60