Motors Starters and Relays
Motor and controller overload protection is covered under this NEC article section.
What is NEC Article 430 Part III?
This term describes the difference between switch activation and reset points.
What is deadband?
This type of proximity sensor draws operating current through the load.
What is a line-powered proximity sensor?
This type of tape is not acceptable for mounting surface boxes and faceplates.
What is double-sided tape?
This device provides the electrical signal related to a contactor’s position.
What is an auxiliary contact?
Transient suppression modules clamp voltage transitions to approximately this percentage of supply voltage.
What is 200%?
This term describes the ratio of capacitance compared to air as the dielectric.
What is dielectric constant?
These are the two types of proximity sensors.
What are load-powered sensors and line-powered sensors?
These are the three support structures used in horizontal cable subsystems.
What are J-hooks, saddles, and ladder racks/trays?
This voltage level occurs when the armature spring overcomes the magnetic field of a power relay.
What is dropout voltage?
These IEC utilization categories apply to lighting and motor control applications.
What are AC-1, AC-2, AC-3, AC-4, AC-5a, AC-5b, AC-6a, AC-6b, and AC-11?
These contacts are open when the relay coil is de-energized.
What are normally open contacts?
This type of switch remains in position after actuating force is removed.
What is a maintained contact switch?
These are the minimum separation distances maintained between communication and electrical systems.
What are 5 inches from lighting, 12 inches from electrical conduit and distribution cables, and 48 inches from motors and transformers?
These contacts must all be replaced together in a magnetic contactor.
What are all moving and stationary contacts for all poles?
This device reduces electrical noise from a motor starter that may interfere with nearby electronic circuits.
What is a transient suppression module?
This voltage keeps an electromechanical device energized after pickup.
What is seal-in voltage?
These are the two types of limit switch operating heads.
What are momentary contact switch and maintained contact switch?
This system enhances communication coverage and serves a critical safety function in large buildings.
What is a distributed antenna system?
These straps are commonly used to neatly bundle VDV cables.
What is Velcro?
Equipment marked UL Recognized is acceptable for incorporation into this type of product.
What is another product that can be UL Listed?
This circuit directs the performance of a controller but does not carry the main power current.
What is a motor control circuit?
These are the three types of push-pull switches.
What are pull, maintained push, and momentary push?
Excess cable coiled inside boxes should be limited to this amount.
What is 6 to 12 inches?
This term means cables are laid straight with no knots, crossovers, or divers.
What is dressing?