This generator, model 076160, has an output noise level of 65 dB(A) at 23 ft. (7m) at normal load.
What transfer switch you will need is determined not only by the generator model but the electrical specifications for your home/building. To make sure you get the right transfer switch for you home and unit you would want to work with your Briggs authorized dealer. You can find a dealer locater by visiting the Briggs & Stratton website
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My apologies for any confusion - because this is a liquid cooled engine you don't need to let it cool completely. The generator is made to run for extended periods of time but you need to keep in mind that it still requires some maintenance. We recommend you check the oil level periodically and change the oil every 100 hours per the maintenance schedule in the operator's manual. The time it takes for you to change the oil, check all other fluid levels and make sure the vents/cooling fins, etc. are clear of debris should only be 1-2 hours and will be enough of a "cool down" period for the liquid cooled engine.
A standby generator is made to extended run times, periodically check the oil levels so the engine doesn't overheat. Follow the basic maintenance chart in the operator's manual, change the oil every 100 hours of use. While the generator is turned off for the oil change you can check all of the fluid levels, make sure the air filter is clean and the vents/exhaust is free of any debris. Give the engine a chance to completely cool down and give it a rest before starting up again.
The 55kw generator will run on Natural Gas and at a full load the BTU/hour is 681500
Your best resource for that level of support would be to contact a local service center. You can find one in your area by clicking here: http://bit.ly/2f9fanP
The amps are 250 (LP) and 229 (NG)
The minimum requirement is 3/4". However, this will vary depending on the length and how may bends the line needs to make. The gas line installer will make the final determination of what size line to use.
The size of this unit in inches is; height: 44.5, length: 98.4, and width: 39.5