busbar`s

Help Support Talk Electrician Forum:

searley

Senior Member
Joined
Sep 12, 2008
Messages
320
Reaction score
0
i got a question in an exam and i don`t know if i got it right.

the effect of a temperature rise on a copper busbar will cause the busbar dimensions to ?

stay the same

increase

decrease

one dimension to decrease

is the red one right.thanks for reeding and your help.cheers

 
Joined
Jun 21, 2008
Messages
17,033
Reaction score
21
Technically expands but at standard operating temperatures unlikely to be even measurable!

So you could argue that strictly it get's bigger but if you can't (realistically) measure it then does it stay the same? ;)

mmm

 
Joined
Mar 28, 2008
Messages
13,621
Reaction score
297
Don't all metals expand when heated up? :eek:

In fact dont plastics expand as well? :|

are there any metals that DON'T expand?? ?:|

Or did I miss somthing in my days at school.... :| :pBlushingGuiness Drink

 

springcrocus

Well-known member
Joined
Jul 3, 2008
Messages
596
Reaction score
-1
Don't all metals expand when heated up? :eek: In fact dont plastics expand as well? :|

are there any metals that DON'T expand?? ?:|

Or did I miss somthing in my days at school.... :| :pBlushingGuiness Drink
No, you're dead right, there are materials with a negative coefficient of expansion.

However a plastic busbar is about as much use as a chocolate teapot ]:) ] :)

 
Joined
Jun 21, 2008
Messages
17,033
Reaction score
21
Don't all metals expand when heated up? :eek: In fact dont plastics expand as well? :|

are there any metals that DON'T expand?? ?:|

Or did I miss somthing in my days at school.... :| :pBlushingGuiness Drink
So are you saying that if the metal heats up and expands the plastic (or metal) CU heats up at the same rate and all the bits continue to fit together ;)

So relative to the CU its the same size..........

:|

 

steptoe

of course Im wrong, ask my wife™
Joined
Feb 13, 2008
Messages
24,344
Reaction score
119
Location
Gtr Manchester
So are you saying that if the metal heats up and expands the plastic (or metal) CU heats up at the same rate and all the bits continue to fit together ;) So relative to the CU its the same size..........

:|
NO,

all metals heat up at different speeds, hence the way thermostats work.

tho afaik all metals heat up and expand to a different degree or more.

bet this wont make sense to anyone but me......

 
Joined
Mar 28, 2008
Messages
13,621
Reaction score
297
both?(incidentally a chocolate teapot could be used for a number of things such as pacifying a pre-menstral woman or serving iced tea!)

:D
How the heck did a thread about Copper Bus-Bars expanding...

get onto "pacifying a pre-menstral woman" ?????? :eek: :|

If we were playing "just-a-minute"...

I would buzz my buzzer and get Mr Parsons to give me a point and the subject for deviation.!! :p :^O:^O

 
Joined
Jun 21, 2008
Messages
17,033
Reaction score
21
How the heck did a thread about Copper Bus-Bars expanding...get onto "pacifying a pre-menstral woman" ?????? :eek: :|

If we were playing "just-a-minute"...

I would buzz my buzzer and get Mr Parsons to give me a point and the subject for deviation.!! :p :^O:^O
The important thing is that the OP's question was answered before the thread decended. That's not always the case. :D

You can have your point if you want it. Applaud SmileyI have no idea what 'Just-a-minutes' is or was :|

 
Joined
Mar 28, 2008
Messages
13,621
Reaction score
297
The important thing is that the OP's question was answered before the thread decended. That's not always the case. :D You can have your point if you want it. Applaud SmileyI have no idea what 'Just-a-minutes' is or was :|
Oh blimey!

showing my age again.... BBC Radio4! ohhhh! :_| :eek: :O

http://www.bbc.co.uk/radio4/comedy/justaminute.shtml

I think you need to get yourself a bit of culture Mr Apache !!!

I dunno the yooof of today! ;) ]:) :p :^O:^O:^O:^O

 
Joined
Jun 21, 2008
Messages
17,033
Reaction score
21
You need some more sockets fitted m8,so you can plug two things in together!!!

I reckon theres a few electricians who could fit one for you!!!! :^O :^O:^O:^O
I'll have a go myself. I have a spare Dbl socket front and a roll of insulating tape. Will this bell wire do, just to run a radio?

:eek:

 
Top