NS EN 400 : 1993

Cooperating organizations
National foreword
Foreword
Specification
Introduction
1. Scope
2. Normative references
3. Definitions and description
4. Classification
5. Requirements
6. Testing
7. Instructions for use
8. Marking
Annexes
A. (normative) Additional requirement for apparatus
     designed for special use
B. (normative) Methods of measurement of the insulation
     resistance of the carrying container
Tables
1. Test conditions
2. Maximum moisture content
Figures
1. Test equipment for mechanical strength
2. Scheme of test rig for compressed oxygen escape
     apparatus
3. Cooler
4. Humidifier
5. Dummy head for apparatus with permanently connected
     full face mask
6. Connector for apparatus having a permanently
     connected mouthpiece assembly
7. Scheme of relief valve leakage test box
8. Scheme of test rig for valve leakage using a single
     cylinder breathing machine
9. Scheme of test rig for relief valve leakage using
     a twin cylinder breathing machine
10. Apparatus for testing of flammability
11. Test piece with painted electrodes for insulation
     resistance test
B.1 Current measurement by microammeter or galvanometer
B.2 (a) Current measurement by means of a d.c. amplifier
B.2 (b) Current measurement by means of a d.c. amplifier
B.3 (a) Determination of the ratio of currents when the
          same voltage is applied successively to the two
          resistances
B.3 (b) Wheatstone bridge method
National annexes
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

Specifies the minimum requirements for compressed oxygen escape apparatus. Refers to self contained closed circuit breathing apparatus, compressed oxygen type. Does not apply to apparatus for work and rescue for diving devices. Includes laboratory and practical performance tests for the assessment of compliance with the requirements. Includes definitions, annexes and tables.