The NEC contains provisions that are considered necessary for this.
What is safety
100
The minimum depth of working space for a 2000 volt disconnect installed in a condition 2 location.
What is 4 feet.
100
Acceptable to the Authority having jurisdiction.
What is approved
100
The minimum rating of all receptacle and cord connectors.
What is 15 amps
100
This letter is printed on a conductor to signify it's thermoplastic makeup.
What is T
200
The code is not intended to be an instruction manual for these people.
What is untrained person
200
The minimum height of the working space for a 8 foot tall motor control center.
What is 8 feet
200
The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
What is ampacity
200
Receptacles and cord connectors that have equipment grounding conductor contacts shall have those contacts connected to this.
What is an equipment grounding conductor.
200
Insulations that are rated for 90 degrees under wet and dry installations usually contain this.
What is -2
300
Code language that specifically requires or prohibits installation actions.
What is mandatory rules/language
300
A point of egress is required on both ends of equipment when the equipment reaches a rating of this or larger.
What is 1200 amps
300
Admitting close approach; not guarded by locked doors, elevation, or other effective means.
What is accessible as applied to equipment
300
A receptacle supplying lighting loads shall not be connected to these unless the plug/receptacle combination is a nonstandard configuration type that is specifically listed and identified for each such unique combination.
What are dimmers
300
Signified by the printing of an X on the surface of the conductor.
What is cross linked polymer or thermoset
400
By special permission, the authority having jurisdiction may waive specific requirements in the NEC or permit alternative methods where it is assured that equivalent objectives can be achieved by establishing and maintaining this.
What is effective safety
400
This is a required posting that is field or factory marked on electrical equipment, such as, switch boards, panelboards, control panels, and other equipment likely to be serviced while energized in order to warn qualified persons.
What is Arc-Flash Hazard Warning
400
Recognizable as suitable for the specific purpose, function, use, environment, application, and so forth, where described in a particular code requirement.
What is Identified
400
A snap switch shall not be grouped or ganged in enclosures with other snap switches, receptacles, or similar devices, unless they are arranged so that the voltage between adjacent devices does not exceed this voltage or unless they are installed in enclosures equipped with identified, securely installed barriers between adjacent devices.
What is 300 volts
400
This type of insulation is a moisture resistant thermoset, often used in underground installations for it's ability to resist moisture penetration during constant exposure to water/moisture.
What is RHW or RHW-2
500
These are (3) examples of installations that are not covered by the code.
What is ships, watercraft, floating buildings, aircraft, autos, mines, railways, communications under the control of a utility, electric utility.
500
Terminals for more than one conductor and terminals used to connect aluminum shall be so.....
What is identified
500
Operation of equipment in excess of normal full-load rating, or of a conductor in excess of rated ampacity that , when it persists for a sufficient length of time, would cause damage or dangerous overheating.
What is an overload
500
This code article requires general-use snaps switches to be clearly marked with an off and on position which has resulted in manufacturers printing the words off and on onto the face of the switch.
What is 404.7
500
At temperatures of this degree, thermoplastic insulation my stiffen causing the insulation to crack.