🔥🔥 Don’t Miss Out on Our End of Autumn Sale. If you have any questions, feel free to click the bottom right corner to contact our customer service..

Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
BSI PD IEC TS 60079-42:2019

BSI PD IEC TS 60079-42:2019

$142.49

Explosive atmospheres – Electrical Safety Devices for the control of potential ignition sources from Ex-Equipment

Published By Publication Date Number of Pages
BSI 2019 28
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Categories: ,

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

This part of IEC 60079, which is a Technical Specification, provides guidance for equipment manufacturers where electrical safety devices are used to reduce the likelihood of potential ignition sources becoming effective in Ex Equipment located in Explosive Atmospheres. Electrical safety devices perform a safety function to control potential ignition sources from both, electrical or non-electrical Ex Equipment in explosive atmospheres.

This document may also be applied to a combination of elements performing a safety function.

For example:

  • Sensor

  • Logic system

  • Final element

This Technical Specification can also be used for assessing the safety device independently, without being designed for a specific Ex Equipment.

A safety device can be a measure to achieve a required EPL of the Ex Equipment with respect to a potential ignition source. The combination of the safety device and the Ex Equipment could then comply with the relevant standards of the IEC 60079 series and the ISO 80079 series with respect to the Equipment Protection Level. However, increasing the EPL of Ex Equipment by the simple addition of a safety device is not within the scope of this document.

This document does not apply to:

  • mechanical control equipment such as pressure relief valves, mechanical governors and other mechanical safety devices

  • the use of gas detection

  • control equipment to prevent the occurrence of explosive atmospheres, e.g. inerting systems and ventilation systems

  • mitigation of an explosion

NOTE Some potential ignition sources might not be practicably controlled by safety devices.

Electrical safety devices, where the level of safety integrity is identified under other parts of the IEC 60079 series, this document can be used as a reference for the realization of the level of safety integrity.

Electrical safety devices may be installed either as part of or separate to the Ex Equipment under control (EEUC) and may be located inside or outside the hazardous area.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 English
CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
10 2 Normative references
3 Terms and definitions
4 Basic requirements
11 5 Ignition prevention by safety devices
5.1 General concept of ignition risk reduction
5.2 Safety characteristics of a safety device
Tables
Table 1 – Minimum RRF for a safety device for ignition risk reduction
12 5.3 Associated safety device
6 Functional requirements for a safety device
6.1 General requirements
6.2 Specification of the safety function
6.3 Requirements for achieving the safety integrity
6.3.1 Simple safety devices
13 6.3.2 Complex safety device
7 Testing and verification
7.1 Type tests
7.2 Proof tests
8 Marking
9 Instructions
15 Annex A (informative)Guidance for assessment of a simple safety device
Table A.1 – Relationship between λd and RRF
16 Annex B (informative)Examples for the application of safety devices
B.1 General
B.2 Ex Equipment with a temperature controlled surface
B.2.1 Problem:
B.2.2 Consequence:
B.2.3 Solution:
17 B.3 Current-dependent safety device for thermal protection of motors with type of protection Ex eb
B.3.1 Problem:
B.3.2 Consequence:
B.3.3 Solution:
Figures
Figure B.1 –Safety device to limit the temperature rise
18 B.4 Risk reduction by ignition control and mitigation, bucket elevator example
B.4.1 Problem
Figure B.2 – Overload protection device to limit the temperature rise of a motor under stall and overload conditions
19 B.4.2 Ignition Hazard Assessment
B.4.3 Safety controls to prevent ignition
Figure B.3 – Bucket elevator principle
20 B.4.4 Safety Controls with explosion mitigation
Figure B.4 – Bucket elevator sensors for ignition hazard detection
21 B.5 Control of high temperatures
B.5.1 Problem
B.5.2 Ignition hazard assessment
Figure B.5 – Controls with explosion mitigation
22 B.5.3 Safety controls
23 Annex C (informative)Use of the Safe Motor Temperature (SMT) sub-function with converter-fed motors
C.1 General
Figure C.1 – Overview
24 C.2 Reliability of the safety motor temperature control function.
C.3 Control without temperature sensors
C.4 Control with temperature sensors
Figure C.2 – Control without temperature sensors
Table C.1– SMT safety sub function Risk Reduction Factors (RRF)
25 Figure C.3 – Control with temperature sensors
26 Bibliography

Related products

BSI PD IEC TS 60079-42:2019
$142.49