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Northern Tool + Equipment, Generators, pressure washers, air compressors, power tools, trailers, heaters, stoves, food processing, go karts, and more! Today’s electrical grid delivers reliable electricity to millions of homes and businesses. Take this weekly quiz to test your knowledge of the 2014 National Electrical Code requirements. Just like last year, California's still the highest-paying state for electrical engineers, according to the latest data from the Bureau of Labor Statistics Occupational Employment and Wages Study from May 2015.
No other variable frequency drive (VFD) can match the proven reliability, operational flexibility and 20-year lifespan of SINAMICS PERFECT HARMONY medium voltage drives.
Lithium-ion battery prices have decreased over the years and are now becoming a viable option for data center UPS. Historically, lighting controls have always had a singular responsibility: Manage the light.
The energy released during an arc flash event can result in severe damage to personnel, equipment, and property.
However, electrical failures that affect large geographic areas do happen on a recurring basis due to hurricanes, floods, or major equipment failures. Ironically, this state (known for gold, silver, and sapphires) is also the lowest-paying state in the country when it comes to electrical engineers. This paper provides a brief overview of li-ion batteries in comparison to VRLA batteries for static UPS applications, including optimal chemistries and technologies. Here are the eight most interesting things, in our opinion, that are going on in the field of solar power.
A 10-year total cost of ownership (TCO) analysis is provided showing li-ion is 39% less than VRLA despite their capital cost premium.
In fact, in 2012, there were more than 2,800 unplanned power outages in the United States that lasted an average of 2.5 hr.
A recent study by the Department of Energy found that financial losses from power outages at data centers ranged from $20,000 to $2 million per occurrence.
While backup generators typically can go 30,000 hr or more between major overhauls, even the best system needs to be exercised and maintained on a regular basis to make sure it operates properly when needed.
When standby generators fail to start or perform as designed, it is usually due to faulty maintenance procedures or neglect. Facilities with qualified in-house technical personnel often can perform required preventive maintenance on diesel generators.

Other facility managers prefer to contract with a local service provider or power system distributor for regular maintenance service, especially if they have generators in multiple locations. In addition to these checks, exercising the power system under load on a weekly or monthly basis ensures that the generator set and its system of controls and transfer switches is operating as designed.
For example, if the generator set will be used frequently or subjected to extreme operating conditions, the recommended service intervals should be shortened accordingly.
The best way to keep track of maintenance intervals is to use the running-time meter on the generator set to keep an accurate log of all services performed. Following are several areas that should be inspected frequently to maintain safe and reliable operation.
Check for leaks at all connections, welds, gaskets, and joints — and make sure that the exhaust pipes are not heating surrounding areas excessively.
Check for excessive smoke upon starting: It can indicate possible performance and air quality issues that may require immediate attention. Look and listen for changes in engine performance, sound, or appearance that will indicate that service or repair is needed. Be alert for misfires, vibration, excessive exhaust smoke, decreases in power, or increases in oil or fuel consumption. Be sure to return the control system back to normal automatic standby (AUTO) when testing and maintenance are completed. For accurate readings on the engine’s dipstick, shut off the engine and wait approximately 10 min. Follow the engine manufacturer’s recommendations for API oil classification and oil viscosity. Heavy-duty diesel engines require a balanced coolant mixture of water, antifreeze, and coolant additives. If available, use low-pressure compressed air or a stream of water in the opposite direction of normal air flow to clean the radiator.
Check the operation of the coolant heater by verifying that hot coolant is being discharged from the outlet hose. In addition, inspect the charge-air cooler for dirt and debris that may be blocking the fins. Even when kept fully charged and maintained, lead-acid starting batteries are subject to deterioration over time and should be replaced approximately every 24 to 36 months — or when they no longer hold a proper charge.
NiCad starting batteries require less maintenance than lead-acid and are often used in mission-critical applications.

However, they are also subject to deterioration and need to be regularly tested under load.
See the Table for the recommended inspection interval for lead-acid batteries and the charging system. As batteries age, their internal resistance to current flow goes up, and the only accurate measure of terminal voltage must be done under load. On some generators, this diagnostic test is performed automatically each time the generator is started. On other generator sets, use a manual battery load tester to verify the condition of each starting battery. If corrosion is present around the terminals, remove the battery cables and wash the terminals with a solution of baking soda and water (¼ lb baking soda to 1 quart of water). Be careful to prevent the solution from entering the battery cells, and flush the batteries with clean water when finished. After replacing the connections, coat the terminals with a light application of petroleum jelly.
However, regular exercising keeps engine parts lubricated, prevents oxidation of electrical contacts, uses up fuel before it deteriorates, and, in general, helps provide reliable engine starting. Periods of no-load operation should be held to a minimum because unburned fuel tends to accumulate in the exhaust system. Whenever possible, test the system with actual building loads in order to exercise the automatic transfer switches and verify performance under real-world conditions.
If connecting to the normal load is not convenient for test purposes, the best engine performance and longevity will be obtained by connecting it to a load bank of at least one-third the nameplate rating.
Preventive maintenance for diesel engine generators plays a critical role in maximizing the reliability of these standby systems and reducing the severe financial and life-safety risks associated with the loss of power. Financial losses from just a single data center outage can cost upward of $2 million in lost revenue.
Preventive maintenance also minimizes the need for repairs and reduces equipment life cycle costs.

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