Final answer:
Most residential buildings are supplied with 120/240 Volt services, which includes three ungrounded conductors (two hot and one neutral), along with a ground connection for safety.
Step-by-step explanation:
The answer to the question 'Most ___ Buildings are supplied with 120/240 Volt services. This means that the cable assembly is made up of ___ ungrounded conductors each supplying 120 V with one ground.' is A) Residential, Three. This is because in a typical residential electrical service in the United States, there are two hot (live) conductors which provide 120 volts each for a combined total of 240 volts when used together, and one neutral (ground) conductor. This three-wire system allows for both 120V for basic household appliances and 240V for heavy-duty appliances such as ovens and dryers.
A ground connection is always provided for safety, creating a low-resistance path to the earth. This ensures that the neutral wire is at zero volts relative to the earth, making it safe to touch (provided the system is functioning correctly). As explained in the descriptions regarding figures (Figures 23.30, 23.31, 23.32, etc.), the neutral wire serves as the return path for the electrical current, and any metallic casing of appliances is also grounded to prevent electrical shock.