DOL starter

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Panel board types

SIEMENS ...

Commercial and Industrial Power distribution systems

Power distribution systems used in multi-family, commercial, and industrial facilities are more complex. A power distribution system consists of metering devices to measure power consumption, main and branch disconnects, protective devices, switching devices to start and stop power flow, conductors,...

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Base current rating table

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Busbars And Their Uses

Used in electrical power distribution, busbars are usually made out of aluminium or copper and they are able to conduct electricity to transmit power from the source of electric power to the load. They are usually supported by insulators and conduct electricity within switchboards, substations or other electric apparatus. Some typical applications of these devices can be to form the interconnectedness...

Enclosure Design for EMC

Most equipment manufactures choose to design custom housings for their electronics products in order to differentiate them in the market place. Usually enclosure design is driven by the two beasts of beauty and cost, with EMC requirements an irritating afterthought. The ideal enclosure from an EMC point of view is the perfect Faraday cage. Take the PCBs that make up a typical product,...

New harmonized color code

Old color code   New color code: ...

NEMA Ratings and IP Equivalency Chart

NEMA Rating IP Equivalent NEMA Definition IP Definition   1 IP10 Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment and to provide a degree of protection against falling dirt 1 = Protected against...

IP Codes in accordance with IEC 529 & UL

There are several different uses of IP Codes, as described in IEC 529. IP Codes can have the following arrangement: ·         First character only, such as IP 3X ·         Second character only, such as IP X4 ·         Both characters, such as IP 34 The first...

UL 508 - The UL Safety Standard for Industrial Control Equipment

Industrial Control Equipment is a term commonly used to represent discrete components ranging from selector switches, relays, contactors, motor starters, timers, pilot lights, to complex system of these components. It encompasses more than 30 different product categories and 100 different devices (See Figure1).   Figure 1: Examples of industrial...

Motor protection

Overload relay with reclosing lockout They should always be used where continuous contact devices (two-wire control) are concerned (e.g. pressure and position switches), to prevent automatic restarting. The reset button can be fitted as an external feature in order to make it...