Thermal health

Measurement guide

Find developing hot spots across bus joints and tap-off terminations.

Hottest monitored joint61.6°CJ04-AAdvisory

Maximum temperature rise33.2KAbove paired local ambient

Temperature channels15/161 stale · excluded from aggregates

Highest joint resistance56.9µΩJ04-A · derived, stable load above 50 A

Joint temperature map

Choose a joint to inspect its feeder and connection readings

A Bus A · joints and tap-offs

B Bus B · joints and tap-offs

Within limits
Thermal warning
Critical
Unknown / stale

J06-B has no current temperature reading. Its electrical channels remain available, and the thermal channel is left out of hottest-point and rise calculations.

Conductor & ambient

Main bus · positive and negative conductors

Measurement	Bus A	Bus B	Unit
Positive conductorMain bus sensor · valid sample	44.2	43.1	°C
Negative conductorMain bus sensor · valid sample	43.8	42.8	°C
Local ambientAir sensor within each bus enclosure	28.4	28.1	°C
Positive conductor riseConductor minus local ambient, derived	15.8	15.0	K
Negative conductor riseConductor minus local ambient, derived	15.4	14.7	K

Connection health

Combine heat, load and contact voltage drop

Thermal channel coverage12 joint + 4 conductor channels across both buses

15/16 in scope

Online resistance estimateDedicated low-level joint voltage measurement / current

R = ΔV / I

Stable-load validity gate|I| must exceed 50 A

Derived

Estimated resistive lossSteady-state estimate for each monitored joint

P = I²R

Hottest-joint rise rateJ04-A · slope over the last 5 minutes

+0.14 K/min

Time to 75 °C critical limitJ04-A · at the present rate of rise, if nothing changes

About 1.5 h

Live contact resistance is an estimate with sensor uncertainty and load qualification, not a de-energized four-wire micro-ohmmeter test. Temperature limits need the actual busway and connection specifications.

Joint diagnostics

Voltage drop is measured directly across each monitored connection

Joint	Load current	Temperature	Rise	5-min rise rate	Joint drop	R estimate	I²R loss	Status
Section 01	177.4 A	42.5 °C	14.1 K	+0.02 K/min	4.44 mV	25.0 µΩ	0.79 W	Normal
Section 01	172.6 A	41.8 °C	13.7 K	+0.02 K/min	3.92 mV	22.7 µΩ	0.68 W	Normal
Section 02	189.3 A	44.8 °C	16.4 K	+0.02 K/min	5.47 mV	28.9 µΩ	1.04 W	Normal
Section 02	185.0 A	43.2 °C	15.1 K	+0.02 K/min	4.74 mV	25.6 µΩ	0.88 W	Normal
Section 03	183.0 A	43.3 °C	14.9 K	+0.02 K/min	4.89 mV	26.7 µΩ	0.89 W	Normal
Section 03	183.5 A	42.9 °C	14.8 K	+0.02 K/min	4.64 mV	25.3 µΩ	0.85 W	Normal
Section 04	204.2 A	61.6 °C	33.2 K	+0.14 K/min	11.62 mV	56.9 µΩ	2.37 W	Advisory
Section 04	199.9 A	46.1 °C	18.0 K	+0.02 K/min	5.76 mV	28.8 µΩ	1.15 W	Normal
Section 05	164.0 A	41.8 °C	13.4 K	+0.02 K/min	3.84 mV	23.4 µΩ	0.63 W	Normal
Section 05	165.2 A	43.7 °C	15.6 K	+0.02 K/min	4.20 mV	25.4 µΩ	0.69 W	Normal
Section 06	175.9 A	45.4 °C	17.0 K	+0.02 K/min	5.35 mV	30.4 µΩ	0.94 W	Normal
Section 06	174.2 A	—	—	—	4.96 mV	28.5 µΩ	0.86 W	Temp unknown

12 connections in scope · Rate is the 5-minute temperature slope · R and loss are derived