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.<\/p>\n
This document may also be applied to a combination of elements performing a safety function.<\/p>\n
For example:<\/p>\n
Sensor<\/p>\n<\/li>\n
Logic system<\/p>\n<\/li>\n
Final element<\/p>\n<\/li>\n<\/ul>\n
This Technical Specification can also be used for assessing the safety device independently, without being designed for a specific Ex Equipment.<\/p>\n
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.<\/p>\n
This document does not apply to:<\/p>\n
mechanical control equipment such as pressure relief valves, mechanical governors and other mechanical safety devices<\/p>\n<\/li>\n
the use of gas detection<\/p>\n<\/li>\n
control equipment to prevent the occurrence of explosive atmospheres, e.g. inerting systems and ventilation systems<\/p>\n<\/li>\n
mitigation of an explosion<\/p>\n<\/li>\n<\/ul>\n
\nNOTE Some potential ignition sources might not be practicably controlled by safety devices.<\/p>\n<\/blockquote>\n
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.<\/p>\n
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.<\/p>\n
PDF Catalog<\/h4>\n
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\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 2<\/td>\n undefined <\/td>\n<\/tr>\n \n 4<\/td>\n English
CONTENTS <\/td>\n<\/tr>\n\n 6<\/td>\n FOREWORD <\/td>\n<\/tr>\n \n 8<\/td>\n INTRODUCTION <\/td>\n<\/tr>\n \n 9<\/td>\n 1 Scope <\/td>\n<\/tr>\n \n 10<\/td>\n 2 Normative references
3 Terms and definitions
4 Basic requirements <\/td>\n<\/tr>\n\n 11<\/td>\n 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 \u2013 Minimum RRF for a safety device for ignition risk reduction <\/td>\n<\/tr>\n\n 12<\/td>\n 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 <\/td>\n<\/tr>\n\n 13<\/td>\n 6.3.2 Complex safety device
7 Testing and verification
7.1 Type tests
7.2 Proof tests
8 Marking
9 Instructions <\/td>\n<\/tr>\n\n 15<\/td>\n Annex A (informative)Guidance for assessment of a simple safety device
Table A.1 \u2013 Relationship between \u03bbd and RRF <\/td>\n<\/tr>\n\n 16<\/td>\n 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: <\/td>\n<\/tr>\n\n 17<\/td>\n 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 \u2013Safety device to limit the temperature rise <\/td>\n<\/tr>\n\n 18<\/td>\n B.4 Risk reduction by ignition control and mitigation, bucket elevator example
B.4.1 Problem
Figure B.2 \u2013 Overload protection device to limit the temperature rise of a motor under stall and overload conditions <\/td>\n<\/tr>\n\n 19<\/td>\n B.4.2 Ignition Hazard Assessment
B.4.3 Safety controls to prevent ignition
Figure B.3 \u2013 Bucket elevator principle <\/td>\n<\/tr>\n\n 20<\/td>\n B.4.4 Safety Controls with explosion mitigation
Figure B.4 \u2013 Bucket elevator sensors for ignition hazard detection <\/td>\n<\/tr>\n\n 21<\/td>\n B.5 Control of high temperatures
B.5.1 Problem
B.5.2 Ignition hazard assessment
Figure B.5 \u2013 Controls with explosion mitigation <\/td>\n<\/tr>\n\n 22<\/td>\n B.5.3 Safety controls <\/td>\n<\/tr>\n \n 23<\/td>\n Annex C (informative)Use of the Safe Motor Temperature (SMT) sub-function with converter-fed motors
C.1 General
Figure C.1 \u2013 Overview <\/td>\n<\/tr>\n\n 24<\/td>\n 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 \u2013 Control without temperature sensors
Table C.1\u2013 SMT safety sub function Risk Reduction Factors (RRF) <\/td>\n<\/tr>\n\n 25<\/td>\n Figure C.3 \u2013 Control with temperature sensors <\/td>\n<\/tr>\n \n 26<\/td>\n Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Explosive atmospheres – Electrical Safety Devices for the control of potential ignition sources from Ex-Equipment<\/b><\/p>\n
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\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n BSI<\/b><\/a><\/td>\n 2019<\/td>\n 28<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":422903,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[551,2641],"product_tag":[],"class_list":{"0":"post-422897","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-260-20","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/422897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/422903"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=422897"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=422897"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=422897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}