[AU] Cable Crossings and Ampacity Webinar

​Join us for a 1-hour technical webinar on cable crossings and ampacity, designed for power engineers, cable designers, consultants, and technical specialists involved in underground cable system design and rating studies.

​Cable crossings can create local thermal bottlenecks that remove thermal margin and directly influence ampacity. While parallel circuits create continuous mutual heating along a route, a cable crossing introduces a concentrated thermal hot spot at a single location. This makes crossings a critical design consideration, particularly when assessing whether both existing and new circuits can continue to operate within temperature limits. 

​In this webinar, we will explain the thermal behaviour of cable crossings, including the role of longitudinal heat flow along conductors and why some cable systems are affected more severely than others. The session will also explore how circuit size, crossing angle, and vertical separation influence derating, and why smaller conductors often experience a greater reduction in ampacity under the same crossing conditions.

​Using a practical BESS 33 kV cable crossing case study, we will walk through how these principles apply in a real project and highlight the design decisions that help reduce derating and maintain acceptable operating temperatures. 

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​What You’ll Learn

​➤ Why Cable Crossings Matter

​Understand how cable crossings create local thermal hot spots that can dictate ampacity and reduce available thermal margin. 

​➤ Cable Crossings vs Parallel Mutual Heating

​Learn the difference between continuous mutual heating in parallel cable systems and the concentrated thermal effect at a crossing point. 

​➤ The Effect of Longitudinal Heat Flow

​See how heat spreads along the conductor near the crossing and how this reduces the temperature rise compared with a purely local heating assumption. 

​➤ Why Smaller Circuits Can Be More Heavily Derated

​Explore why smaller conductors heat up more for the same external heat input and are less effective at spreading that heat along the conductor.

​➤ How Crossing Angle and Vertical Separation Affect Ampacity

​Review why shallow crossing angles usually create the greatest derating, why increasing crossing angle is the most effective first step, and when increasing vertical separation becomes most useful.

​➤ Case Study: BESS 33 kV Cable Crossing

​Walk through a practical case study showing how a new BESS circuit crossing under an existing circuit can be assessed, and how thermal limits and minimum required current ratings are checked in practice. 

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​Why You Should Attend

​Cable crossings are a common part of underground cable design, but their impact on ampacity is often underestimated. A poorly designed crossing can create a localised thermal bottleneck, particularly for smaller cable circuits or shallow crossing angles. This webinar will give you practical engineering guidance on how crossings behave, what design variables matter most, and how to reduce derating through better crossing layout and thermal assessment.

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​Event Details

​Duration: 1 hour

​Presenters: Jayson Patrick and Dr Edstan Fernandez

​Delivered live twice for Australia (15:00 - 16:00 AEDT) and US/EU (12:30 - 13:30 GMT)

​Date: 26-03-2026 [March 26, 2026]

​Includes: Live Q&A and certificate of attendance

​Terms and Conditions

​• Attendees who complete the survey form will receive their certificate within 2 to 3 business days.

​• Survey forms expire within 48 hours after the webinar.

​• Paid attendees will receive access to the slides and recording after the session.