Connecting a generator to electrical panel

A generator is the main equipment  that people are looking for in case of power outage. But how to power your house or how to power your ‘commercial business’, remains the bottle neck. Let’s consider the case when a power outage lasts for several hours. Maintaining illuminated your business or running your computers for a short time, using an UPS for example, it is not a problem. But what about a power outage that lasts for several hours or worse case days? Food into freezers will deteriorate soon or submersible pump will not maintain dry your basement. You can find a portable generator, but if you are not able to connect it to your house, what to do? The connection requires skills and full respect of the National Electric Code. Not mentioning the complex matter of security.  A wrong connection, not preventing the back-feed (e.g. connection of the generator to the national grid), could electrocute any technicians who are working on the lines, causing injury or even death. Back-feed, cannot only damage the generator, but has the potential to cause a fire.

To prevent these situations you are required to use an Automatic Transfer Switch.  Not only It will detect a power loss but, it will start your standby generator and automatically connect your electric system in a safe way. Today the cost of this equipment are affordable. If you have to power a house, you can install a 4KVA, 6KVA or 9KVA automatic transfer switch. If you are looking for higher power, there are solutions up to 500kVA. It depends on the domain you are working with: industrial, commercial or telecom. Each segment has its own particularities.


Backfeeding via a generator electrical panel

We have to clarify some issues about generators, loads and mains: standby applications or parallel applications. In a standby application the generator will never be connected to the grid. In parallel application the generator may be connected to the grid. Normally, you cannot legally bring an AC generator onto the grid unless some technical & legal conditions are met. To connect a generator to the grid, the sine wave must be in phase with the grid, frequency must be the same and other requirements have to be strictly satisfied. This is accomplished by using special & complex controllers (regulators & synchronizers). Last but definitely not least the system must pass special inspections. More frequent is the use of the generator for standby application by using standby generator or small backup generator. A standby generator is a permanently installed apparatus, much like a compressor. A backup generator is a small, sometime gasoline portable, generator that you put in position outside the house, for example, and then plug into the control panel. Or it can be connected to electrical loads via heavy-duty extension cords. Back-feeding is a dangerous situation in which, electricity from your generator flows back through your electrical panel  into the utility company's electrical system. Back-feeding can occur when a generator is connected to your home wiring system without disconnecting from the utility power. This could  READ MORE...........


BACK-FEEDING is the major risk in case you want to connect a generator to your electrical system