Quantcast Reading  Electrical  Diagrams  and  Schematics

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DOE-HDBK-1016/1-93 ELECTRICAL DIAGRAMS AND SCHEMATICS Electrical Diagrams and Schematics Reading  Electrical  Diagrams  and  Schematics To  read  electrical  system  diagrams  and  schematics  properly,  the  condition  or  state  of  each component must first be understood.   For electrical schematics that detail individual relays and contacts, the components are always shown in the de-energized condition (also called the shelf- state). To associate the proper relay with the contact(s) that it operates, each relay is assigned a specific number  and/or  letter  combination.    The  number/letter  code  for  each  relay  is  carried  by  all associated  contacts.   Figure  14  (A)  shows  a  simple  schematic  containing  a  coil  (M1)  and  its contact.    If  space  permits,  the  relationship  may  be  emphasized  by  drawing  a  dashed  line (symbolizing  a  mechanical  connection)  between  the  relay  and  its  contact(s)  or  a  dashed  box around them as shown in Figure 14 (B).   Figure 14 (C) illustrates a switch and a second set of contacts that are operated by the switch. Figure 14   Examples of Relays and Relay Contacts PR-03 Rev. 0 Page 14


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