How is the heat rise risk score calculated?

It weights severity at 0.40, occurrence at 0.35, and detection at 0.25 and sums them. With scores of 6, 4, and 3 the result is 6x0.40 + 4x0.35 + 3x0.25 = 4.55.

What is a good heat rise risk score?

Lower is better. On a 1 to 10 input scale, scores above roughly 6 to 7 warrant urgent action, while a 4.55 sits in the moderate band that justifies a scheduled thermal scan rather than an emergency shutdown.

Why weight severity highest?

An overheating failure in switchgear can cause an arc-flash or fire, so consequences dominate. The 0.40 weight on severity reflects that a high-consequence hotspot outranks a merely frequent minor one.

How does this relate to an FMEA RPN?

It is a weighted variant of the classic severity-occurrence-detection risk priority number. Instead of multiplying the three, it applies fixed weights so no single factor can swamp the score.

What raises the detection score?

Score detection high when a hotspot would be hard to catch, for example an enclosed connection with no infrared window and no continuous temperature monitoring, so it silently degrades between inspections.

Can I use measured temperature instead of scores?

You can map a measured rise to a severity or occurrence score, but the tool is designed for the qualitative ranking used in reliability programs rather than direct degree inputs.

Switchgear, Panelboards & Electrical Distribution calculator

Heat Rise Estimate Calculator

Heat rise inside switchgear is the leading precursor to insulation failure, loose-connection burndowns, and arc-flash events, so quantifying its risk is central to preventive maintenance. This calculator turns three judgment scores, the severity of an overheating failure, how often it is likely to occur, and how detectable it is before damage, into a single weighted risk number. Reliability engineers and thermography teams use it to rank which panels and connections get infrared scans, torque checks, or load rebalancing first. Unlike a raw temperature reading, it captures the maintenance reality that an undetectable, high-consequence hotspot is far more dangerous than an obvious one.

What this calculator does

Heat rise inside switchgear is the leading precursor to insulation failure, loose-connection burndowns, and arc-flash events, so quantifying its risk is central to preventive maintenance.
Use it when heat rise estimate in switchgear, panelboards and electrical distribution needs a defensible ranking against other switchgear, panelboards and electrical distribution risks for the next review.
It computes a weighted risk score from severity, occurrence, and detection ratings for a potential thermal or overheating failure.

Formula used

Heat Rise Estimate risk score = severity × 0.40 + occurrence × 0.35 + detection × 0.25

Inputs explained

Temperature-rise severity of failure:
Likelihood of overheating event:
Detectability before damage:

How to use the result

Use it to prioritize infrared inspections, connection torque audits, and load balancing across a fleet of panels and switchgear.
Scores are subjective judgments, not measured temperatures; the number ranks relative risk rather than predicting an actual heat rise in degrees.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
On-highway diesel averages $4.58 per gallon this week (EIA), trending down over recent periods. Truck tonnage is up 3.4% year over year (ATA via FRED).
The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

How is the heat rise risk score calculated? It weights severity at 0.40, occurrence at 0.35, and detection at 0.25 and sums them. With scores of 6, 4, and 3 the result is 6x0.40 + 4x0.35 + 3x0.25 = 4.55.
What is a good heat rise risk score? Lower is better. On a 1 to 10 input scale, scores above roughly 6 to 7 warrant urgent action, while a 4.55 sits in the moderate band that justifies a scheduled thermal scan rather than an emergency shutdown.
Why weight severity highest? An overheating failure in switchgear can cause an arc-flash or fire, so consequences dominate. The 0.40 weight on severity reflects that a high-consequence hotspot outranks a merely frequent minor one.
How does this relate to an FMEA RPN? It is a weighted variant of the classic severity-occurrence-detection risk priority number. Instead of multiplying the three, it applies fixed weights so no single factor can swamp the score.
What raises the detection score? Score detection high when a hotspot would be hard to catch, for example an enclosed connection with no infrared window and no continuous temperature monitoring, so it silently degrades between inspections.

Last reviewed 2026-05-12.