I've seen these terms posted a few times on here. No "if you don't know what an ringpiece extension is you're lucky to be alive" type prophecies of doom please.
Rgds.
Rgds.
What's the difference between a spur and extended ring main?
- Thread starter bpowell555
- Start date
A spur is taken from a final ring circuit (ringmain), by connecting a length of cable from an existing socket (this socket can't be a spur itself it must be part of the ring) & terminating it into a new socket.
Ring extension as it says is extending the final ring circuit, at a socket disconnect one of the cables, put new length of cable from the socket to the new socket(s), from the last new socket take a length of cable back to the old disconnected cable & join (use crimps).
If you find that difficult to follow take a look in the reference section you'll find something there.
Ring extension as it says is extending the final ring circuit, at a socket disconnect one of the cables, put new length of cable from the socket to the new socket(s), from the last new socket take a length of cable back to the old disconnected cable & join (use crimps).
If you find that difficult to follow take a look in the reference section you'll find something there.
Althought the term "ring Main" is not strictly correct. A ring main is used by the power supply companies to connect up towns and villages. The correct term should be "ring final", but it seems that ring main has been used for that long now that it has stuck with us.
Yup, like "low voltage" meaning 12V, "bulb" instead of "lamp", "centrifugal force" when there is no such thing etc etc.....
ban-all-sheds said:
I must disagree. Yes centrifugal force is often misrepresented, but it must exist or Newtons third law would be incorrect. A quote to clarify:
"The centrifugal force does not act on the body in motion; the only force acting on the body in motion is the centripetal force. The centrifugal force acts on the source of the centripetal force to displace it radially from the center of the path. Thus, in twirling a mass on a string, the centripetal force transmitted by the string pulls in on the mass to keep it in its circular path, while the centrifugal force transmitted by the string pulls outward on its point of attachment at the center of the path."
"Centrifugal force instead of centripetal force" would have bene more accurate.
Apologies for the off topic nit-picking, rather than the on topic nit-picking
i tend to view centrifugal force as the apparent outward force opposing the centrepetal force
ofc there is no such actual force the centrepetal force is balanced by the acceleration needed to maintain an orbital movement but inside your centrifuge its much simpler to think in terms of a cetrifugal force acting on the particles contained inside the centrifuge.
modelling anything is about simplification and sometimes simplfication requires use of aparent things that are actually just the resultant of other things interacting.
ofc there is no such actual force the centrepetal force is balanced by the acceleration needed to maintain an orbital movement but inside your centrifuge its much simpler to think in terms of a cetrifugal force acting on the particles contained inside the centrifuge.
modelling anything is about simplification and sometimes simplfication requires use of aparent things that are actually just the resultant of other things interacting.
Agreed that if you have a fixed reference, a pivot, and a ball rotating on a peice of string there is no centrifugal force as far as the ball is concerned. The ball is in a constant state of acceleration (speed may constant, but it's velocity vector is constantly changing - hence acceleration) due to the centripedal force supplied by the string. If you consider the pivot this is supplying the centripedal force and is stationary, so as far as the pivot in concerned the centripetal force is balanced by the outward (centrifugal) force the ball exerts on it.
Newton assumed a fixed reference somewhere in the universe, others don't. This opens the possibily that gravitational effects of the rest of the universe are exerting centrifugal forces on the ball itself http://www.thekeyboard.org.uk/What is centrifugal force.htm
Newton assumed a fixed reference somewhere in the universe, others don't. This opens the possibily that gravitational effects of the rest of the universe are exerting centrifugal forces on the ball itself http://www.thekeyboard.org.uk/What is centrifugal force.htm
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