Single Line Diagrams
FAQ
What is a single line diagram?
A single line diagram (SLD) — also called a one-line diagram — is a simplified electrical drawing that represents your facility’s power distribution system using single lines and standardized symbols. It shows the relationship between electrical components including transformers, switchgear, circuit breakers, protective devices, and conductors, providing a clear overview of how power flows through your system from the utility service entrance to end-use equipment.
Why is a single line diagram important?
A single line diagram is one of the most important safety and operational documents a facility can have. It allows engineers, electricians, and facility managers to quickly understand the layout of the electrical system, identify isolation points during maintenance, troubleshoot faults, and plan system modifications. It is also a prerequisite for arc flash studies, protection coordination studies, and most engineering analyses of your electrical system.
Does Sabino Electric create single line diagrams as a standalone service?
Yes. Sabino Electric creates single line diagrams as a standalone service for facilities that need accurate documentation of their existing electrical infrastructure. This is common for older facilities where original drawings are missing, outdated, or inaccurate. Sabino Electric’s engineers perform a field survey of your system and produce a complete, accurate single line diagram that reflects the actual installed configuration.
Can Sabino Electric update an existing single line diagram?
Yes. Sabino Electric can review and update existing single line diagrams to reflect modifications, upgrades, or additions made to your electrical system since the original drawings were produced. Keeping your single line diagram current is essential for safety, compliance, and effective system management.
What information is included in a Sabino Electric single line diagram?
Sabino Electric’s single line diagrams include all relevant electrical components and their interconnections, equipment ratings, protective device types and settings, transformer configurations, bus arrangements, metering points, and other details required to fully represent your power distribution system. Diagrams are produced to industry standards and can be delivered in both print and digital formats.
Is a single line diagram required for regulatory compliance?
Yes. Many electrical safety standards and regulations — including NFPA 70E for arc flash safety — require facilities to maintain accurate electrical drawings including single line diagrams. Insurance providers and regulatory inspectors may also request current electrical documentation as part of audits or incident investigations.
Where does Sabino Electric provide single line diagram services?
Sabino Electric provides single line diagram services throughout Arizona, and through the BCES Global network of subsidiary companies, across the rest of North America.
How do I arrange single line diagram services with Sabino Electric?
Contact Sabino Electric at 520-623-6061 or through the request form at sabinoelectric.com. Our engineering team will assess your documentation needs and provide a proposal for creating or updating your single line diagrams.
