VFD Variable Frequency Drive When a VFD Variable Frequency Drive is being selected for a specific motor application the first question is “Is it a Variable Torque or a Constant Torque application ?” The short answer is VARIABLE TORQUE = All Centrifugal Pump and Fan motor
480V 3 Phase is the most common power system used in US industrial plants. American National Standards Institute (ANSI) classifies 208V, 240V and 480V 3 Phase power as low voltage power systems. Other ANSI voltage classifications are Medium, High, Extra High, and Ultra High Voltage th
How does Electrical Power work? If you’re not electrically minded, think of 3 Phase vs Single Phase electric power as something easier to visualize like mechanical power. They’re very different, but both deliver power using pressure (force) and flow (speed). In both the po
208V Single Phase and 208V 3 Phase power are easy to use, but hard to understand. If you want a simple understanding but aren’t electrically minded, start with a simple analogy you can build on. I like the bicycle analogy. Bicycle Analogy A tandem bicycle has two people providin
240V power is used in the US and parts of the world. In the US 120 / 240V 1 Phase 3 Wire is the standard for homes and 240V 3 Phase Open Delta is the standard for small buildings with large loads. In parts of the world 240V Single Phase 2 Wire is the standard for homes. Actual power c
Like most industries the electrical industry uses many acronyms. The ones most commonly associated with electrical control panels are UL508A, NEC, NEMA, and IEC. These are acronyms for the safety standards used to produce and install electrical control panels and electrical wiring sys
Electrical control panels are designed and used to control mechanical equipment. Each one is designed for a specific equipment arrangement and includes devices that allow an operator to control specified equipment. Electrical panel components control every piece of equipment in every
Electrical panel components are electrical power components when they’re used in electrical power circuits that power physical devices like Lighting, Heaters, Motors, etc. In the US, electrical power circuit wiring must follow the National Electric Code (NEC), a standard by the
Electrical panel components that are logical control devices are electrical control components. They’re used to control the sequence of events that define how a control panel functions. Some are manually actuated like a light switch and easy to understand. Let’s focus on e
NEMA Enclosure ratings define where an enclosure was designed to be used and the level of protection it was designed to provide. In the electrical world, NEMA stands for National Electrical Manufacturers Association, an association of US based equipment manufacturers that produce stan