17th Edition Corrigendum

[Andrew Gabriel]

There's a 4 page corrigendum published...

had to smile at the retraction of the phrase "As a rule of thumb" ;-)

[Roger]

The message from [e-mail] (Andrew Gabriel) contains these words:

Seems there was too much copy and paste without enough reworking in the original.

"A radial final circuit starts and finishes at the distribution board, where it is connected to an 30 A or 32 A overcurrent protective device."

Whoops.

Now amended to:

"A radial final circuit starts at the distribution board, where it is connected to an overcurrent protective device."

[Andy Hall]

Don't see why. There are Fleming's left and right hand rules.

[Frank Erskine]

And the corkscrew rule, which also uses the thumb.

[John Rumm]

aka Oersted's right hand grip rule - much better than Fleming's when dealing with coils...

[geoff]

Is this from personal experience ?

[Dave Liquorice]

And shipwrights.

[PCPaul]

What if you don't have a shipwright handy?

[Andy Hall]

You use Fleming's right hand rule.

[Frank Erskine]

You've got to find your own corkscrew.