Heaters must maintain spacing from combustibles as specified by the equipment listing unless the equipment is designed for direct contact.

Appliances operating at 50 volts or higher must be listed to ensure safety and compliance.

Luminaires used as raceways must be listed and marked for this purpose to ensure compliance and safety.

Ceiling-suspended fans must be supported by a listed outlet box or system identified for fan support to handle the weight and motion of the fan safely.

Replaceable heating elements rated over 1 ampere must be legibly marked with voltage, amperage, or wattage ratings to ensure proper replacement.

Luminaires must have shades or guards to ensure that adjacent combustible materials do not exceed 90°C.

Heating elements in boilers rated over 48 amperes must be subdivided into circuits, each not exceeding 48 amperes, to limit damaging short-circuit energy.

Concealed conductors must comply with Chapter 3 wiring methods or use wiring from a Class 2 power source installed per NEC 725.130 to maintain safety and compliance.

Luminaires near combustible low-density cellulose fiberboard must be spaced 1.5 inches unless marked for installation directly on fiberboard.

Article 422 covers all electrical appliances used in any occupancy, regardless of type or application.

Article 424 covers fixed electric equipment such as baseboard heaters, heating cables, and central heating systems used for space heating, excluding process heating and room air conditioning.

Branch-circuit conductors must have an ampacity of at least 125% of the total load to prevent overheating during extended operation.

NEC prohibits the use of reconditioned luminaires, lampholders, and retrofit kits to ensure compliance and reliability.

Surface-mounted luminaires on fiberboard must either be marked for this condition or spaced at least 1.5 inches from the surface.

Central heating equipment must be supplied by an individual branch circuit, except for auxiliary or associated equipment like pumps or air conditioners, which can share the circuit.

Thermal protection prevents overheating in recessed luminaires, protecting both the luminaire and surrounding materials.

Luminaires installed in wet locations must prevent water entry and must be marked as suitable for wet locations.

Nameplates must include information such as voltage, wattage or amperage, and frequency to ensure the equipment is correctly installed and operated.

Flexible cords for built-in dishwashers must be between 3 and 6.5 feet to ensure proper installation and safe operation.

Heavy-duty lighting track fittings must have individual overcurrent protection to handle the increased load safely.

Nameplates must include the manufacturer’s name and the equipment’s ratings in voltage, wattage, or amperage to ensure proper identification and compliance.

Grounding conductors must meet NEC 250.122, and multisection panels must be bonded using jumpers sized per NEC 250.102(D).

Surface-mounted luminaires must maintain at least 12 inches of clearance from the nearest point of clothes closet storage space.

Outlet boxes must be covered by a suitable canopy, faceplate, or similar device to protect wiring and ensure a finished look.

Low-voltage lighting systems must not exceed 15 volts AC or 30 volts DC in wet locations to minimize shock risks.

Decorative lighting must be listed for holiday or similar purposes to meet safety standards during temporary use.

Luminaires suitable for damp locations must be marked either for wet or damp locations as per NEC requirements.

Pendant luminaires or lampholders are not allowed in clothes closets to reduce the risk of contact with combustibles.

Heating cables must maintain at least 2 inches of clearance from the heated ceiling to comply with NEC requirements.

Equipment installed in damp or wet locations must be listed for such conditions and designed to prevent water accumulation in wired sections.

Industrial control panels must be marked with a short-circuit current rating and installed only where the available fault current does not exceed this rating, ensuring safety.

Disconnecting means for industrial control panels serving motor loads must comply with Part IX of Article 430, covering motor control requirements.

The disconnecting means must disconnect all ungrounded conductors simultaneously and be capable of being locked in the open position to comply with safety requirements.

Appliances must have overcurrent protection based on their marked rating or the applicable NEC requirements, ensuring proper protection.

Non-Type IC recessed luminaires must maintain at least 1/2 inch of clearance from combustibles, ensuring safe operation.

NEC requires that wiring within luminaires be neatly arranged and protected from physical damage to ensure safety and durability.

Electric-discharge lighting systems in dwellings must have open-circuit voltages of 300 volts or less to reduce risks.

Germicidal luminaires must comply with their listing’s specified minimum height to avoid harmful exposure to occupants.

Framing members in suspended ceilings must be securely attached to the building structure, ensuring proper support for luminaires.

Branch circuits for fixed industrial process heating equipment must be sized at 125% of the total load, as they are considered continuous loads under NEC.

Loads exceeding 48 amperes must be subdivided into circuits, each protected by a device rated at no more than 60 amperes, to reduce short-circuit risk.

Appliances must have visible or easily accessible nameplates showing voltage, amperage, and wattage ratings, ensuring compliance and easy reference.

Appliances over 300 volt-amperes must have a branch-circuit breaker or switch within sight or capable of being locked open, ensuring safe servicing.

Article 410 encompasses luminaires, portable luminaires, lampholders, and related wiring and equipment, including decorative and seasonal lighting.

Dishwashers at 150 volts or less to ground must have Class A GFCI protection to safeguard against electrical shock.

Fixed space-heating equipment in damp or wet locations must be listed for such conditions to ensure safety and functionality.

Luminaires in commercial cooking hoods must be identified for this specific use to handle grease, heat, and vapors safely.

Article 425 applies to fixed industrial process heating equipment employing electric resistance or electrode heating technologies, such as boilers, duct heaters, and immersion heaters.

Thermostatically controlled switching devices must manually disconnect all ungrounded conductors and feature a clearly marked “off” position for compliance.

Factory-installed receptacle outlets must not connect to the heater circuit, ensuring compliance with general electrical circuit requirements.