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Flexible cords can indeed be used as bus drop cable attached to a building when approved methods are applied. This means that the installation must adhere to specific standards and guidelines that ensure safety and compliance with the National Electrical Code (NEC).

Using flexible cords in this manner allows for some versatility in electrical installations, particularly when installing temporary or adaptable power solutions. However, it's essential that these flexible cords are used in a way that prevents potential damage or hazards, such as by ensuring they are properly secured and not subject to physical stress that could lead to wear and tear.

In contrast, options that suggest limitations, like temporary use only or restrictions solely to residential applications, don't fully encompass the scenarios in which flexible cords can be used safely and effectively as bus drop cables. There are instances beyond just temporary use where these cords are appropriate, provided that they are installed properly and follow approved methods. The assertion that flexible cords are never allowed completely overlooks the specific circumstances and code provisions under which their use is permissible.