{"id":39,"date":"2010-12-15T10:26:33","date_gmt":"2010-12-15T10:26:33","guid":{"rendered":"https:\/\/mincorp.co.za\/index.php\/2010\/12\/15\/electrical-cabling-characteristics\/"},"modified":"2019-09-16T18:49:16","modified_gmt":"2019-09-16T18:49:16","slug":"electrical-cabling-characteristics","status":"publish","type":"page","link":"https:\/\/mincorp.co.za\/index.php\/installation\/electrical-cabling-characteristics\/","title":{"rendered":"Electrical Cabling Characteristics"},"content":{"rendered":"

ELECTRICAL CABLING CHARACTERISTICS<\/o:p><\/span><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Nominal Size:<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

Full load current ( Amps)<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

Resistance per metre at 20\u00b0 C (\u00b0\u03a9)<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

.63<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

5<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.024<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

.80<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

6<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.021<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

1.00<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

8.75<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.016<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

1.25<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

10<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.013<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

1.60<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

13<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.009<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

2.00<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

17.5<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.008<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

2.50<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

22.75<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.007<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

3.00<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

27.5<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.005<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

4.00<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

32<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.004<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

6.30<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

43<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.003<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

8.00<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

55<\/o:p><\/span><\/span><\/p>\n<\/td>\n

\n

0.002<\/o:p><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/span><\/o:p><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

VOLTS DROP<\/o:p><\/span><\/span><\/span><\/strong><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

To determine the volts drop in a single core the following information is required:<\/o:p><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

1.        <\/span><\/span><\/span>Size of conductor<\/o:p><\/span><\/span><\/p>\n

2.        <\/span><\/span><\/span>Volt drop\/metre\/amp<\/o:p><\/span><\/span><\/p>\n

3.        <\/span><\/span><\/span>Length of wire<\/o:p><\/span><\/span><\/p>\n

4.        <\/span><\/span><\/span>Amps (loading of cable)<\/o:p><\/span><\/span><\/p>\n

5.        <\/span><\/span><\/span>Operating temperature<\/o:p><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

Volts drop = Volt drop\/metre\/amp x length x Amps x temperature conversion factor<\/o:p><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

EXAMPLE<\/o:p><\/span><\/span><\/span><\/strong><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

Consider a cable 2.0 mm2, 10 metres long with a loading of 15 Amps operating at 30DC<\/o:p><\/em><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/em><\/p>\n

Volt drop = Vd\/m\/A x 1 x I x Temp factor<\/o:p><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

From graph, volts drop\/m\/A for 2.0 mm2 = 0.0085<\/o:p><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

Temperature conversion factor   <\/span><\/span><\/v:stroke><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:f><\/v:formulas><\/v:path><\/o:lock><\/v:shapetype><\/v:imagedata><\/v:shape><\/span>  <\/span>=   <\/span><\/span>1,039 @ 30DC<\/em><\/o:p><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

Volts drop = 0.0085 x 10 x 15 x 1,039 = 1.325 Volts<\/o:p><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

In D.C.systems, the conductor resistance at its operating temperature should be used in the calculation of the volt drop withinthe cable. Note that a multiplier of 2 is needed since both the load and return contribute to the drop in voltage provided theyare of the same nominal size.<\/o:p><\/span><\/span><\/p>\n

 <\/span><\/o:p><\/span><\/p>\n

(Resistance temperature conversion factor. Table G SA<\/span><\/a>BS 150-1970 page 41)<\/o:p><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

ELECTRICAL CABLING CHARACTERISTICS     Nominal Size: Full load current ( Amps) Resistance per metre at 20\u00b0 C (\u00b0\u03a9) .63 5 0.024 .80 6 0.021 1.00 8.75 0.016 1.25 10 … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":33,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/pages\/39"}],"collection":[{"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/comments?post=39"}],"version-history":[{"count":2,"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/pages\/39\/revisions"}],"predecessor-version":[{"id":116,"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/pages\/39\/revisions\/116"}],"up":[{"embeddable":true,"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/pages\/33"}],"wp:attachment":[{"href":"https:\/\/mincorp.co.za\/index.php\/wp-json\/wp\/v2\/media?parent=39"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}