Requires separation of oil-filled equipment (transformers) from other plant, fire-resistant cables, drainage for burning oil, and consideration of fire spread. It references IEC 61936-1 annexes for transformer fire separation distances.
Overhead/underground lines between separate installations, electrified railways, mining equipment, ships, and medical X-ray equipment. Core Technical Requirements
By following the guidelines and requirements outlined in IEC 61936-1, electrical power systems can be designed and installed to meet the highest standards of safety, reliability, and performance. Core Technical Requirements By following the guidelines and
It does not cover:
For engineers and contractors, navigating international standards is a core part of ensuring safety and operational excellence. One of the most critical frameworks in high-voltage (HV) engineering is , which establishes the common rules for power installations exceeding 1 kV AC. | Aspect | IEC 61936-1 | IEEE 80
| Aspect | IEC 61936-1 | IEEE 80 (US) | EN 50522 (European) | |--------|-------------|--------------|----------------------| | Scope | AC >1 kV | AC substation earthing only | AC >1 kV (earthing focused) | | Earthing method | Simplified uniform soil | Detailed, uniform soil | Similar to 61936-1, but more European references | | Clearances | Yes (tables) | No | Yes, similar | | Arc fault | Yes (general) | No | More detailed (internal arc classes) | | Legal status | Voluntary | Voluntary (but US practice) | Harmonized – often mandatory in EU |
Assigning responsibility to the user for extinguishing systems, escape routes, and preventing oil discharge that could ignite. electrical power systems can be designed
Note: EN 50522 largely aligns with IEC 61936-1 for earthing, but some EU countries still refer directly to the IEC version.
| Who should use it | Why | |------------------|-----| | | Mandatory – defines minimum safety and clearance rules. | | Safety engineer | Critical for earthing, step/touch voltage assessment. | | Project manager | To ensure all basic safety clauses are budgeted (arc vents, fire walls, earthing mats). | | Student / trainee | Excellent first standard to learn substation design fundamentals. |
While titled "exceeding 1 kV AC", most clearances and rules are clearly defined up to 245 kV. For higher voltages (e.g., 420 kV), many users apply it with caution or switch to IEC 61936-2 (DC) or country-specific HV standards.
IEC 61936-1 is an essential standard for power installations exceeding 1 kV AC. By following the general requirements outlined in this standard, electrical power systems can be designed, installed, and operated safely and efficiently. The standard helps to ensure that electrical power systems meet required safety, reliability, and performance standards.