Category Archive for: «Low Voltage»

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3 Lighting Essentials You Can’t Deny

Light Control / Energy Savings Lighting systems in industrial facilities can represent an attractive savings opportunity, especially if lighting systems have not been upgraded or maintained in the past five years. The most cost-effective approach for lighting energy savings is to address the following three issues, in order: Turn off lights during times when they are not […]

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4 Low Voltage Switchboard Partitioning Forms Defined By IEC 61439-2

Reasons for partitioning // There are 4 main reasons for partitioning a switchboard. To protect persons against direct contact with dangerous parts. The minimum degree of protection must be IPXXB. To protect the switchboard against the penetration of solid foreign bodies. The minimum degree of protection must be IP2X. To limit the propagation of an electric arc inside the switchboard […]

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Degradation of Insulation in Switchgear (What’s Really Happening)

Partial Discharge (PD) Electrical insulation is subjected to electrical and mechanical stress, elevated temperature and temperature variations, and environmental conditions especially for outdoor applications. In addition to normal operating conditions, there are a host of other factors that may trigger accelerated aging or deterioration of insulation. Both normal and accelerated aging of insulation produce the […]

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Inspection, Test and Measurement Procedures for LV and MV (up to 36kV) Switchgears

Importance of checks and maintenance Installed in clean, well ventilated or air-conditioned locations, switchgear will require little routine maintenance. Major inspection should be scheduled for power plant shutdowns and concentrate for low voltage switchboards on identifying contact wear, correct operation of interlocks, correct overload settings and fuse sizes, signs of overheating, and undue dirt or corrosion. For MV […]

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Electrical life (durability) of LV circuit breakers due to the switching operations

Test requirements According to the standard IEC 947-2, there is actually no defined stipulation regarding the requirements of electrical life of a circuit breaker. The numbers of switching operations which a circuit breaker under no-load, normal load, overload and short-circuit conditions has to make and/or break are stipulated. These numbers vary between two switchings (O-t-CO) […]

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7 Practical Tips For Installing a Good Measuring System

1. Start from the need: what do I want to measure? A single electric parameter or all the electric parameters There are different product families on the market: instruments that measure a single electric parameter (voltage, current, frequency, phase angle cosϕ), generally used in single phase systems, as instrumentation on the machine, and instruments that enable all the […]

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Guidelines to Maintenance of Low Voltage Switchboard

Maintenance Benefits and Facilities A. Maintenance Program A well-executed maintenance program can provide the following benefits: Longer life of switchboard and fewer replacements; Reduced time on repairs and overhauls, and the option of scheduling them at an opportune time; Fewer failures with unexpected outages; Timely detection of any undesirable operating conditions which require correction; Improved plant […]

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Rating Definitions Applied to Low Voltage Molded-Case Circuit Breaker (MCCB)

For system protection 600V and below The molded-case circuit breaker is the “workhorse” for system protection 600V and below. A circuit breaker is a device designed to open and close by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating. The following terms apply […]

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Methods Of Securing LV Circuit Breakers

Methods Circuit breakers are typically secured in place by one of the following methods: Through bolts Bolted to the bus Stab locked to the bus or some type of receptacle connection Din rail mounted Bolted Type Breakers When a longer service life breaker is wanted, a bolted type is typically used. These types have a […]

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Methods Of Mounting LV Circuit Breakers

Three general groups Methods used to mount circuit breakers can be divided into three general groups, those being: Fixed Removable (disconnectable unit), and Drawout (withdrawable) A review of these mounting methods follows. Fixed Mounted Circuit Breakers A circuit breaker that is bolted in its enclosure and wired to the load frame, we can call a […]

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