Lamps as testers and residental fuses blowing

[cadpoint]

http://forums.mikeholt.com/showthread.php?t=112937

I read this thread two times and couldn't figure out who's right and what's right about using a lamp or lamps as a tester.
Let me state that I usually have to study these things very closely, I didn't get it! I am going back to this one,
I think I understand this it just hasn't set in, anyone with me, raise your hand! :|

My first thought is how could you tell the brightest of a lamp in a dark area with your eyes adjusting to a dark area verses, direct daylight or even shaded daylight ? ? ?

Now if someone can diagram where your attaching and what this tip/trick is
or present a good diagram of what your doing here, wouldn't we all better to understand it ?

Frankly, I don't think there will be a diagram presented, but just the same if anyone knows if these type diagrams exist in some old books, let me know!

No, I didn't even search Google for this, shame on me...

 

[480sparky]

I think you're referring to my method.

I use two lamps to find a short in a circuit because of the chance the short is after a load.

I install two temp bulb sockets at the OCD. On goes in series with the OCD and the branch circuit ungrounded. The other is between the OCD and the ground right in the panel.

The brightness of the top bulb depends on 1. if there is a load turned on in the circuit and 2. where in the circuit the short to ground is.

Pardon my crude, quick illustration.

 

[SEO]

It's best to use the same type of bulb and same wattage in each socket.