{"id":266431,"date":"2024-10-19T17:46:50","date_gmt":"2024-10-19T17:46:50","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-63531983\/"},"modified":"2024-10-25T13:48:14","modified_gmt":"2024-10-25T13:48:14","slug":"bs-63531983","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-63531983\/","title":{"rendered":"BS 6353:1983"},"content":{"rendered":"<p>This British Standard specifies requirements for underground loudspeaker communication systems that are equipped with the facility for connecting speech and other audio signals to another loudspeaker communication system and\/or to an appropriate surface switchboard to form a loudspeaker communication network.<\/p>\n<p>Electrical input and output characteristics of underground loudspeaker communication systems necessary to achieve operational compatibility when they are interconnected are specified.<\/p>\n<p>The requirements for tone signals specified in clause <b>5<\/b> do not apply to signals that are not transmitted to another system.<\/p>\n<p>This standard is applicable to underground loudspeaker communication systems that are intended to be certified intrinsically safe for use in coal mines in accordance with BS 5501-9 for group I category \u201cia\u201d systems.<\/p>\n<p>This standard is not applicable to mine telephone systems.<\/p>\n<blockquote>\n<p>NOTE 1 Further requirements for intrinsic safety are specified in BS 1259 and BS 5501-7.<\/p>\n<p>NOTE 2 The titles of the publications referred to in this standard are listed on the inside back cover.<\/p>\n<\/blockquote>\n<p>Specifies electrical interface characteristics, interconnection facilities, tone signals and transmission distance.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Specification for underground loudspeaker communication systems in coal mines<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>1983<\/td>\n<td>12<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":266436,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1061,2641],"product_tag":[],"class_list":{"0":"post-266431","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-73-100-99","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\/266431","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\/266436"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=266431"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=266431"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=266431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}