On the Job

Harness the Light

I installed a box for the chandelier in an attic the bottom normally is required to be flush with the ceiling but after installing it there were layers       too thick preventing this. So to help prevent the risk of fire in the box, a box extender was used. 

This is a view from the attic

This is the view from below

The plastic box extender is flush with the ceiling when finished. The box prevents a fire from spreading by having It enclosed should a fire occur it will choke itself and won't set aflame all the surroundings. 

#10-32 screws were indicated in the box to be used for installing the box.  But longer ones of same diameter.

I believe it was #8 of the same kind

Also 

https://m.youtube.com/watch?v=YbEZOT8rVW4 

How to Wire an Electrical Panel

This video involves installing wires in a breaker panel. NOTE: the wires terminated should be more rounded not 90 degrees. If there is too much bend the electrical voltage or "pressure" could potentially blow the wire. 

I have only seen panels involving 240v where the A & B surrounding the incoming neutral are 120v each

 I believe the below Panel is an FPE panel (possible Fire potential) these are outdated and dangerous they come with cloth wire and dangerous porcelain tubes. These all can cause electrocution, fire, and death. The clothe wire may have some insulation but these outdated wiring materials are extremely dangerous.

http://www.ismypanelsafe.com/fpe.aspx

This replaced the Old FPE panel

The amperage of the circuit breaker depends on the minimum amperage of the device or load that will run. 

For example

The below label for the outside air conditioning condenser 

MIN. CKT AMPACITY  25.7

AMPERAGE MINIMUM

The maximum is 40

The circuit breaker in the panel is a Double Pole 30amp breaker 

NEC does not want to get anywhere near the maximum amperage because any more than that actually damages the device and may harm the user. 

In this way once the condenser unit reaches an amperage above 30 then the breaker trips thus cutting off power to the circuit and avoiding damage.

Arc Fault Circuit Interrupters (AFCI)

http://www.afcisafety.org/qa.html#howdetected

These breakers are used primarily for rooms that people spend much time in like in rooms where you are expected to sleep. If an arc fault occurs the Breaker trips thus helping to prevent electric shock or fire where one may be sleeping.

These help with safety but have some minor drawbacks. For instance some devices or loads such as some vacuum cleaners types can trip the breaker due to a presence of arc that normally occurs within the device. The breaker detects this and trips.