The phrase "are usually set at" is correct and usable in written English.
It can be used when discussing standard values, limits, or settings in various contexts, such as pricing, measurements, or regulations.
Example: "The speed limits on highways are usually set at 65 miles per hour."
Alternatives: "are typically established at" or "are generally fixed at".
That's because an array's electrical voltage and current are usually set at just one point: the inverter that changes direct current to alternating current.
Dividends are usually set at a fixed annual rate that must be paid before dividends are distributed to the common stockholders.
While legal boundaries and regulations for social entrepreneurship are usually set at the national level, relations with the government at the local level are most important for social enterprises.
This resulted in eight total experiments, which was less than the full factorial design of 16, as shown in Table 5. Designs with factors that are usually set at two levels assume that the effects of the factors are linear.
In humans, the therapeutic and toxic plasma concentrations of digoxin are usually set at 0.8 - 1.6 ng/mL and greater than 2.4 ng/mL, respectively [ 29].
Drinking water standards are usually set at a fraction of the no observed adverse effect levels (NOAELs) because potential health risks are often unknown or hard to predict.
This is why the refresh-rate on a television screen is usually set at that value.
The age is usually set at 18, but in New York it's only 16, and in Montana it's 14.
The minimum CD34+ stem cell dose considered sufficient for successful engraftment is 2 × 106 cells CD34+/kg, but the optimal target is usually set at 5 × 106 CD34+/kg.
This preference is expressed in a discount rate which, depending on interest rates, is usually set at somewhere between 3% and 6%.
Card rates are based on a bank's prime rate, which is usually set at 300 basis points, or three percentage points, above the high end of the Fed's benchmark.
