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automatic transfer switches

What is an Automatic Transfer Switch?

Automatic transfer switches continually monitor utility power. Any anomalies such as voltage sags, brownouts, spikes, or surges will cause the internal circuitry to command a generator to start and will then transfer to the generator when additional switch circuitry determines the generator has the proper voltage and frequency. When utility power returns or no anomalies have occurred for a set time, the transfer switch will then transfer back to utility power and command the generator to turn off, after another specified amount of "cool down" time with no load on the generator.

What's the difference between open, closed and delayed transition transfer switches?

Open transition breaks from the emergency source and then connects to the normal source power (break before make). Closed transition connects in parallel to both emergency and normal source before disconnecting the emergency source (make before break), this ensures no power interruption. Delayed transition waits for a specified period after breaking from an emergency source before connecting with the normal source.

What's the difference between a standard, one-way and two-way bypass transfer switches?

A standard transfer switch has no bypass associated with it, these are typically used in non-life safety applications where in case maintenance is required the power can be disconnected. One-way bypasses are typically used in applications where interruptions are unacceptable. The one-way bypass allows you to bypass the transfer switch for maintenace purposes without having any down time. Two-way bypass transfer switches are used in life safety applications where down time is not an option ex) hospitals. A two-way bypass allows the transfer switch to be bypassed on both the normal and emergency side without affecting interruption to any power source.

What sizes of transfer switches do you sell?

At EEP we sell transfer switches ranging from 40A to 4000A for standard switches, 40A - 800A for one-way bypasses and 100A - 4000A in two-way bypasses.

load banks

What is a Load Bank?

Load Banks are devices designed to provide electrical loads for testing power sources such as generators and Uninterruptible Power Supplies (UPS). Load banks are also used to reduce "wet stacking" problems in diesel engines of backup generating systems.

Why should I use a load bank?

CSA code requires generators to be load bank tested on a yearly basis. This ensures that the generator can handle the required load in case a power failure were to happen.

Can load banks be trailer mounted?

EEP sells load banks that can be mounted on a trailer, they range in size from 500KW to 3MW

What sizes of load banks do you sell?

At EEP we sell load banks ranging from 10KW to 700KW in portable and 50KW to 4MW in permanent load banks.