temperature rise in bus bar
temperature rise in bus bar
(OP)
Could anyone tell me why bus bar ampacity tables show a higher ampacity rate for higher a higher temperature rise? It doesn't make sense to me.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
temperature rise in bus bar
|
RE: temperature rise in bus bar
If so which part does not make sense? The temperature o of the bus will rise higher with higher curernt. May be you are confused in relationship of actual temperature of the bus bar, the ambient temperature and the temperature rise of the busbar.
Actual temperature= Ambient temp + Temperature Rise
Amapcity is altimately related to what maximum temperature is sustaibable witout over heating either the conductor material or its insulation or its enclosure. So if the assembly/insulation can withstand higher temperature you can use the busbar/conductor to carry higher current.
For example, say an assembly is rated for 100 deg C max at certain ampacity. Now if it is to be used in ambient of 45 degC , it will be said to have 55 deg temperature rise. The same assembly could be rated to have 70 deg temperature rise in 30 deg C ambient. Or in other words it will be able to carry more current than compared to a 50 deg. temperature rise. But the key there is to know ambient temperature.
Hope this helps.
RE: temperature rise in bus bar
yours