One-Line Diagrams & Electric Load Analysis
Accurate electrical documentation is essential for safe operations, regulatory compliance, and informed decision-making. Southern Electrical Services provides professional one-line diagram development and electric load analysis for industrial and commercial facilities throughout Houston.
A one-line diagram (also called a single-line diagram) is the fundamental electrical engineering document for any facility. It shows the complete electrical distribution system in simplified form — from the utility service through every level of distribution down to major loads. Many facilities operate without current, accurate documentation, creating safety risks and making troubleshooting, maintenance, and expansion far more difficult and expensive than necessary.
Our One-Line Diagram Services
New One-Line Diagram Development
For facilities without documentation or with outdated drawings, our team performs a field survey of the complete electrical distribution system and develops accurate, professional one-line diagrams reflecting the actual installed configuration.
Drawing Updates and As-Built Documentation
After electrical modifications or additions, we update existing drawings to reflect the current configuration. Keeping drawings current is essential for maintenance safety and regulatory compliance.
Electric Load Analysis
Detailed calculation of all electrical loads — demand loads, connected loads, and projected future loads — to determine service entrance sizing, feeder requirements, and available capacity for expansion.
Short Circuit and Arc Flash Studies
Using the one-line diagram as the foundation, we perform short circuit calculations and arc flash hazard analysis per NFPA 70E requirements to establish proper PPE categories and equipment ratings.
Power Quality Studies
Harmonic analysis, voltage unbalance assessment, and power factor evaluation to identify power quality issues affecting your equipment reliability and energy costs.
Why Accurate One-Line Diagrams Matter
- Required for OSHA and NFPA 70E compliance and arc flash labeling
- Essential for accurate short circuit and protective device coordination studies
- Required by insurance companies for facilities with complex electrical systems
- Critical for safely planning maintenance shutdowns and equipment work
- Speeds troubleshooting dramatically — a $5,000 drawing can save $50,000 in downtime
- Required for any electrical permit and inspection
- Enables informed capacity planning for future expansion
Request Documentation Services
Contact us to discuss your facility's documentation needs and get a quote.
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