With the exception of the vertical busses wire #1 and #2, you should increase the wire number by __________ each time a switching component is crossed from line side to load side when wire-numbering a ladder diagram.
If the fused vertical bus contains control contacts, as is typical in a control circuit which contains a safety circuit, you should add one to the wire number of the last control line number before the vertical contacts when identifying the load-side of the control contacts.
When identifying the load-side of the first switching component in the next consecutive control line, you should add one to the last wire number used.
You should take the long way home.
Sometimes two series-connected switching components will be paralleled with a single switching component: wire number across the series-connected devices first.
This means that across the single parallel device, the wire number may be increased by more than just one number.
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