Single-line diagram

A single-line diagram, also called a one-line diagram or SLD, is a simplified drawing that shows an electrical system using one line for its circuits. Utilities ask for a functional single-line diagram as part of interconnection submittals. On these submittals, each protective and switching device has to carry its standard ANSI device number, as listed in ANSI C37.2. For example, device number 89 is a line switch. For storage projects, sample single-line and control diagrams show how a behind-the-meter solar plus storage system ties in, including a line-side tap point of interconnection. Monitoring installation manuals include a typical single-line diagram, sometimes with a communication table, to show where meters and data equipment connect.

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• sentence 1: support check: partial - Passages only show the names 'One-line diagram' and 'SLD | Single-line Drawing'; they give no definition of a simplified drawing using one line for circuits.
• sentence 2: support check: partial - Exhibit gives guidelines for functional SLD submittals, implying utilities want them, but doesn't explicitly say they are required in interconnection submittals.
• sentence 3: support check: partial - Passages say device numbers are necessary per ANSI C37.2 but don't say each protective and switching device must carry one.
• sentence 5: support check: partial - Sample diagram title shows behind-the-meter solar+storage with line-side tap POI, but nothing on 'storage projects' generally or showing how it ties in beyond the title.
• sentence 6: support check: partial - Passages show manuals with typical single-line diagrams and a communication table figure, but not their purpose of showing where meters and data equipment connect.
• sentence 1: review: partial - The passages confirm the names one-line diagram and SLD (single-line drawing), but they give no definition of a simplified drawing that uses one line for circuits. -->