{"id":252883,"date":"2024-10-19T16:42:06","date_gmt":"2024-10-19T16:42:06","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-78562017\/"},"modified":"2024-10-25T12:02:19","modified_gmt":"2024-10-25T12:02:19","slug":"bs-78562017","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-78562017\/","title":{"rendered":"BS 7856:2017"},"content":{"rendered":"

This British Standard specifies requirements for special design and other features of newly manufactured directly connected alternating current watthour meters with ratings up to and including 100 A I<\/i> max<\/sub> for installation in domestic and small commercial\/industrial premises.<\/p>\n

This standard is principally aimed at the UK market, although it might also be of use to other markets. Within the UK the standard is aimed at manufacturers who intend to design and market meters, meter operators engaged in meter installation activities and those involved in meter procurement, such as energy suppliers and meter asset providers.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
4<\/td>\nForeword <\/td>\n<\/tr>\n
7<\/td>\n1 Scope
2 Normative references
3 Terms and definitions <\/td>\n<\/tr>\n
8<\/td>\n4 Mechanical features <\/td>\n<\/tr>\n
9<\/td>\nTable 1 \u2014 Dimensions and spacing of fixing holes and terminals <\/td>\n<\/tr>\n
10<\/td>\nFigure 1 \u2014 Spacing of fixing holes and terminals for single-phase, two-wire meter <\/td>\n<\/tr>\n
11<\/td>\n5 Electrical features
Table 2 \u2014 Standard currents for meters of Class A or Class B <\/td>\n<\/tr>\n
13<\/td>\nFigure 2 \u2014 Diagrams of connections for a single-phase, two-wire, one-rate meter <\/td>\n<\/tr>\n
14<\/td>\nFigure 3 \u2014 Diagrams of connections and graphical symbols for a two-element meter used on three-wire systems <\/td>\n<\/tr>\n
15<\/td>\nFigure 4 \u2014 Diagrams of connections and graphical symbols for a two-element meter used on a two-phase, four-wire system <\/td>\n<\/tr>\n
16<\/td>\nFigure 5 \u2014 Diagrams of connections and graphical symbols for a three-element meter used on a three-phase, four-wire system <\/td>\n<\/tr>\n
17<\/td>\n6 Other features <\/td>\n<\/tr>\n
18<\/td>\nAnnex A (normative)\u2002 Test method of a terminal’s ability to safely clamp standard UK cables <\/td>\n<\/tr>\n
19<\/td>\nFigure A.1 \u2014 Test arrangement for clamping ability of a meter terminal <\/td>\n<\/tr>\n
20<\/td>\nAnnex B (normative)\u2002 External rate switching logic for multi-rate meters
Table B.1 \u2014 Sequence for multi-rate registers having two to eight rates <\/td>\n<\/tr>\n
21<\/td>\nAnnex C (normative)\u2002 Long-term overcurrent test requirements <\/td>\n<\/tr>\n
22<\/td>\nAnnex D (normative)\u2002 Performance criteria for load switches inside meters
Table D.1 \u2014 Performance criteria for supply control and load control switches <\/td>\n<\/tr>\n
23<\/td>\nFigure D.1 \u2014 Polyphase meter supply control switch test timing <\/td>\n<\/tr>\n
24<\/td>\nFigure D.2 \u2014 Contact resistance derived from mV drop measured at meter terminals at Imax <\/td>\n<\/tr>\n
25<\/td>\nAnnex E (normative)\u2002 Sealing criteria <\/td>\n<\/tr>\n
26<\/td>\nAnnex F (informative)\u2002 Operational considerations related to switches inside meters <\/td>\n<\/tr>\n
27<\/td>\nFigure F.1 \u2014 Typical heating in a 100 AImax meter when subjected to 1.45 * Imax <\/td>\n<\/tr>\n
28<\/td>\nTable F.1 \u2014 Thermal stresses on a 100 A SCS protected by various OCPD ratings <\/td>\n<\/tr>\n
29<\/td>\nTable F.2 \u2014 Characteristics of OCPDs in common domestic use in the UK <\/td>\n<\/tr>\n
30<\/td>\nFigure F.2 \u2014 Current levels for determining OCPD characteristics <\/td>\n<\/tr>\n
32<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Specification for special design and other features of alternating current watthour meters for active energy for use in the UK (Accuracy Classes A and B)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2017<\/td>\n34<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":252887,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[285,2641],"product_tag":[],"class_list":{"0":"post-252883","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-220-20","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\/252883","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\/252887"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=252883"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=252883"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=252883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}