Final answer:
The most likely problem after updating the wiring in an office building would be an outlet not properly grounded. This presents a safety risk and might be indicated by multiple devices failing to operate when connected to the same outlet.
Step-by-step explanation:
Given that the wiring in the office building has just been updated, the most likely issue is d. Outlet not properly grounded. Improper grounding can lead to several electrical problems, including the risk of electric shock and the potential for electrical fires. If the toaster and coffeemaker do not work when plugged into the same outlet, this indicates a problem with the outlet itself rather than the appliances. Having a proper ground is crucial, as it allows the circuit breaker to trip in case of a fault, effectively preventing electrical shock and damage to appliances.
For instance, worn insulation resulting in a live/hot wire coming into contact with the metal case of an appliance without a ground connection can cause severe shock. However, this situation can be avoided with a proper ground that would cause the circuit breaker to trip, as shown in Figure 23.34. This is a safety measure to force repairs before any harm can be done.