Where open conductors cross ceiling joints and wall studs and are exposed to physical damage which are located within _____ of the floor, they shall be protected.

No temporary branch-circuit conductor may be laid on the floor:

Temporary electrical power and lighting installations of 600 volts, nominal, or less may be used for a period not to exceed _____ days for Christmas decorative lighting, carnivals, and similar purposes;

Distribution apparatus, such as transformer and capacitor cases, mounted on wooden poles, at a height exceeding ____ above ground or grade level

Two wire dc systems operating at over 50V through 300V between conductors shall be grounded unless they are fire protection signaling circuits having a maximum current of _____amperes:

Where the voltage between conductors is 300V or less, these outside conductors can come no closer than _____ of the highest point of the roof:

The grounding conductor is an non energized circuit conductor that is connected to the earth through the system ground:

The clearance between lead-in conductors and any lightning protection conductors outside a building may not be less than ______:

Class 2 and Class 3 systems do not require the same wiring methods as power, light and Class I systems:

Grounding requirement of Class III locations are the same as those for Class II locations:

_______ or longer horizontal raceway shall be used that connects Dust ignition proof enclosure and the junction box not required to  be dust ignition proof which are in Class II location:

Storage batteries which are usually lead-acid or alkali produce explosive gases mainly _____ when overcharged: