Probable Effect Concentration Quotients (PECQS) Practice Test

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In residential installations, what is the nominal voltage for circuits supplying receptacles?

120 V
230 V
240 V
600 V

The correct answer is: 230 V

In residential installations within the United States, the nominal voltage for circuits supplying receptacles is typically 120 V. This voltage level is well-suited for most household appliances and electronic devices, making it a standard in homes for power outlets. In contrast, while options like 230 V, 240 V, and 600 V may be applicable in other regions or for specific applications, they are not the standard for household receptacle circuits in residential settings. For example, 240 V is commonly used for high-power appliances like dryers or stoves but not for general receptacles. Similarly, voltages of 230 V and 600 V do not correspond to common household receptacle standards in many countries, further establishing that 120 V is the most appropriate answer in this context.