Temperature Rise Limits
Infrascan Thermal Imaging engineers compare the specific (hot) points on your thermal imaging report to the temperature rise limits tabled below. The closer the temperature is to the limit, the more severe the fault.
Infrascan has never had a major fault related event in our 15 year history.
Infrascan's interpretation of the Australian Standards:
AS 3768-1990
Surfaces of components
Surfaces of components
|
Description
|
Temperature rise
above ambient |
|
For Metallic manual controls:
For Non Metallic manual controls: |
55
|
|
Touched in normal operation but not continuously held:
Metallic Non Metallic |
70 80 |
|
Accessible but not touched in normal operation:
Metallic Non Metallic |
80 90 |
Screwed contacts
|
Uncoated copper + aluminium etc
|
50
|
|
Terminals for screwed or bolted connection to external conductors
|
50
|
|
Maintenance Procedures
Guidelines for the establishment of maintenance procedures. |
|
Cable
|
|
The operating temperature of unmarked PVC-insulated or elastomer-insulated cables is 75°C.
|
|
Other cables to a maximum of 105°C (Polythene, PVC, solid extruded PVC tubing, 1.0 mm thick, high temperature heat shrink tubing with a minimum walla thickness of 0.45 mm after shrinkage, etc).
|
|
This temperature must not be exceeded at any point where the insulation is relied upon.
|
|
Parts of Assemblies
|
|
Parts of ASSEMBLIES
|
Temperature rise
above ambient |
|
Terminals for external insulated conductors
|
70
|
|
Manual operating means: Metal
Manual operating means: Insulation |
15
25 |
|
Accessible external enclosures & covers: Metal
Accessible external enclosures & covers: Insulation |
30
40 |
|
Discrete arrangements of plug and socket-type connections
|
Equipment
Specific |