bselliott

Monday, June 22, 2009

Emergency electrical power

Emergency electrical power is defined as an independent reserve source of electric energy which, upon failure or outage of the normal source, automatically provides reliable electric power within a specified time.

A reliable and adequate source of electric power is necessary for the operation of active industrial operations. Power must also be available at to provide water for fire protection,energy for automatic fire alarms, light for security purposes, heat for preservation of critical industrial equipment, andfor other operations.

Power, supplied by either the local utility company or generated on-site. The source of distribution may be subject to brownout, interruption or extended outage. Safety, and health requirements may require an uninterruptible power supply (UPS) or standby/emergency supply for specific critical loads.Justifiable applications for emergency electrical power are:

  1. Hospitals (life support, operating room, emergency lighting and communication, refrigeration, boiler plant, etc.).

  2. A class B plant (considered a standby long term
    power source) is used where multiple commercial
    power feeders are not available or extended and
    frequent power outages may occur.

  3. Airfields (control tower, communications, traffic control, engine start, security, etc.).

  4. Data processing plant systems.

  5. Critical machinery

  6. Communication and security.


Thursday, June 04, 2009

Electromagnetic Fields

Electric and magnetic fields (EMFs) are areas of energy that surround electrical devices. Power lines, electrical wiring, and appliances produce EMFs. Some people worry about EMF exposure and cancer. A few studies found a link between EMF exposure and a higher risk of childhood leukemia, but the link is weak. Other studies didn't find a link between EMF exposure and other childhood cancers.

For adults, studies of EMF exposure from power lines and electric blankets show little evidence of a link to cancer. In adults, EMFs may reduce heart rate and interfere with brain electrical activity during sleep. This may or may not affect your health.

Some people worry that wireless and cellular phones cause cancer. They give off radio-frequency energy (RF), a form of electromagnetic radiation. Scientists need to do more research on this before they can say for sure.

Monday, June 01, 2009

Erectile Dysfunction

Erectile dysfunction (ED) is when a man has trouble getting or keeping an erection. ED becomes more common as you get older. But male sexual dysfunction is not a natural part of aging.

Some people have trouble speaking with their doctors about sex. But if you have ED, you should tell your doctor. ED can be a sign of health problems. It may mean your blood vessels are clogged. It may mean you have nerve damage from diabetes. If you don't see your doctor, these problems will go untreated.

Your doctor can offer several new treatments for ED. For many men, the answer is as simple as taking a pill. Getting more exercise, losing weight or stopping smoking may also help.