In many single-phase ac power applications, the power-carrying conductors are labeled as either Line and Neutral or as Line 1 and Line 2. Line and Neutral Versus Line 1 and Line 2 Recommended for You: Explore the Basics of USB-C and USB Power Delivery Modern power supply designs which utilize a two-conductor plug are constructed with sufficient insulation to ensure the safety of the design without requiring the ground conductor. Power delivery is accomplished with the two power-carrying conductors, and the ground conductor is present for increased safety from dangerous voltages. The three conductors consist of two power-carrying conductors and a third Protective Earth (PE), Frame Ground (FG), or safety ground conductor. In most of the international markets, single-phase ac power has been standardized to be delivered with three conductors, although not all three conductors are employed in all applications. Photo: CUI Two Conductor Versus Three Conductor Japanese Type A plug with two narrow spades (left) and North American Type A plug with narrow and wide spades (right). Some wall mount power adapters have a similar feature, but instead of changing the ac power cord, the ac blades are interchangeable to accommodate different regions or countries. With these products, it is possible to connect to different styles of wall sockets (in other regions or countries) by changing the ac power cord to one with the appropriate wall plug configuration. Many products with ac power cords have a standard ac inlet at the product chassis into which the power cord is connected. Different ratings often employ physically different connector contacts such that mismatched plug and socket combinations cannot be engaged.įor desktop adapters, the ac connection is a cord, whereas a wall plug adapter will have an integrated plug. The maximum current rating for the connectors is also standardized. Since wall plug voltages are standardized, the ac power connectors are similarly rated to provide sufficient insulation for the standard voltages. Most countries have well-defined plug and socket combinations, voltages, and frequencies.
Let’s explore common ac and dc input and output power connectors and how they are used.Īc wall plug selection is typically straightforward and comes down to two criteria: In what regions and/or countries is the power supply intended to be used, and does the application require two conductors or three conductors.
Dc output connectors are much less standardized, and therefore only a commonly available subset of the connectors will be discussed. Single-phase ac-dc wall plugs and desktop power supplies with ac wall plugs (input) and dc power connectors (output) are standardized, as are the associated voltages and maximum currents thus, the discussion regarding those connectors is greatly simplified. I ask this because the load could increase as it is driving a shelf with items on.Power supplies have both input and output voltages and thus often have associated input and output connectors.
I assume that this is the maximum current it can draw, although could the starting current exceed this or exceed the max current rating of the AC adapter (6 amps max)? The eBay listing for the motor (I couldn't find a decent datasheet) states that its locked-rotor current is 3.25 amperes. With 5.9v across the motor, it drew 1.8 amps (with a load). I tested the current drawn with this load with some batteries. The motor drives a system of pulleys to lower/raise a shelf in a linear motion, so it has some load. I intend on using some insulation tape around this to make it safer. The AC adapter has a pin output like on a laptop charger, so I used an adapter which allows me to screw in the positive and negative wires. I have wired it directly to a DC motor (rated for 12 volts) using wire rated for 21 amps. I am using an AC adapter which outputs 12 volts DC. I just wanted to check that this setup is safe as I am not an electrical engineer, nor am I experienced.
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