Luminaire Basics
This type of recessed luminaire is also commonly referred to as a "downlight."
What is a recessed luminaire?
Classrooms typically prefer luminaires with a high rating in this color-rendering metric.
What is CRI (Color Rendering Index)?
This type of heating cable can be cut to length and spliced in the field because its electrical paths change in response to temperature.
What is self-regulating cable?
To prevent water from tracking into components on outdoor deicing installations, this should be installed at each component.
What is a drip loop?
Any voltage up to this amount is considered "low voltage" by the industry standard.
What is 1,000V?
These five design methods are used to determine a luminaire's light intensity and distribution pattern.
What are baffles, reflectors, lenses, diffusers, and louvers?
According to the Energy Information Administration, electric lighting consumes more than this percentage of energy in commercial buildings.
What is 30%?
In hospitals and schools, heat-tracing systems are often used to maintain the temperature of these specific piping systems.
What are domestic hot-water piping systems?
This NEC Article covers the requirements for all fixed outdoor electric deicing and snow-melting equipment.
What is Article 426?
Per NEC Section 408.3(E)(1), AC phasing in switchboards must be labeled in this order when facing the front.
What is A, B, C?
This international organization classifies luminaires for general lighting based on the percentage of light emitted above and below the horizontal plane.
What is the Commission Internationale de l’Eclairage (CIE)?
Following a loss of normal power, an exit luminaire must remain lit for at least this many minutes.
What is 90 minutes?
Unlike self-regulating cables, these constant-wattage, series-resistance cables cannot be cut to length or terminated in the field.
What are Mineral-Insulated (MI) cables?
This is considered the most energy-efficient method for controlling a roof and gutter deicing system.
What is an automatic moisture/temperature controller?
This type of switch is often used in place of a circuit breaker.
What is a bolted pressure switch?
These luminaires provide indirect lighting by directing light upward from a concealed location, often called a cove or cornice.
What are concealed luminaires?
This is the ratio of spacing to mounting height that produces uniform lighting.
What is the Spacing Criterion (SC)?
When wrapping heating cable in a spiral around a pipe, the additional cable needed is determined by these two factors.
What are pipe size and the pitch?
Snow-melting and anti-icing systems typically rely on cables installed in this specific pattern.
What is a serpentine pattern?
This survey is used to check for hot spots in switches, busways, and circuit breakers.
What is a thermographic survey?
This type of lighting distributes 90% to 100% of its light downward.
What is direct lighting?
This specific type of dimming system provides color-changing ability and operates through a full range of illumination without flickering.
What is an LED dimming system?
This type of cable, also known as "zoned heating cable," is a parallel-resistance cable used on metal pipes requiring high-power output.
What is power-limiting cable?
Snow-melting cable should not be routed within this many inches of pavement edges, drains, or anchors in concrete.
What is 6 inches?
What is the magic number regarding 3-phase electrical systems?
What is 1.732(square root of 3)?