Is it Code or is it common practice
Name that circuit rating
99

nonmetallic sheathed cable gets staples within 12in of a box and then 4.5 ft

What is Code (found in Article 334.30)

200

three feet of working space for any live parts 150 volt or less

This is code 

300

When installing receptacles positioning the ground plug in the up position

What is common practice?  

400

Wrapping your hooks on a device in the clockwise motion

What is Common practice

500

Positioning/'height of switches

What is code and Common practice

500

You have two HVAC units with a power output of 3000Watts each running on 240volt circuit

What is 25 amps requiring a 30 amp breaker