Critical equipment voltage and size (UPS, battery, generator, power distribution, transfer switch, computer room air conditioning).All substations, including integral relays and main panels and the exact nature of the load in each feeder and on each substation.All main cable and wire run with their associated isolating switches and potheads (size and length of run).Current/potential transformers (size, type, and ratio).Power transformers (rating, winding connection, and grounding means).Incoming main fuses, potheads, cutouts, switches, and main/tiebreakers.To give you an accurate picture of your electrical system, the single-line diagram information normally includes: As such, the single-line diagram is like a balance sheet for your facility and provides a snapshot of your facility at a moment in time. Whether you have a new or existing facility, the single-line diagram is the vital roadmap for all future testing, service, and maintenance activities. It shows a correct power distribution path from the incoming power source to each downstream load – including the ratings and sizes of each piece of electrical equipment, their circuit conductors, and their protective devices. An accurate single-line diagram ensures optimum system performance and coordination for all future testing and can highlight potential risks before a problem occurs.Īn effective single-line diagram will clearly show how the main components of the electrical system are connected, including redundant equipment and available spares. The single-line diagram also becomes your lifeline of information when updating or responding to an emergency. It is the first step in preparing a critical response plan, allowing you to become thoroughly familiar with the electrical transmission system layout and design. It is a high-level diagram that shows how incoming power is distributed to the equipment. Single-line diagram (SLD) is also known as a one-line diagram. LinkedIn WhatsApp Twitter Facebook Email 1.
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