"Electrical spider box" isn't a standard term in electrical terminology. It's likely a slang or regional term that could refer to a few different things, depending on the context. Here are some possibilities:

1. Junction Box with Many Wires: It could refer to a junction box, which is a box used to connect and protect electrical wires, that has a large number of wires coming in and out. The "spider" part might refer to the many wires radiating out like a spider's legs.

2. Multi-Outlet Box with Multiple Devices: It could be a colloquial term for a multi-outlet box, which is a box that allows multiple electrical devices to be plugged in. The "spider" might refer to the multiple plugs extending from the box.

3. A Specific Type of Junction Box: In some regions, "spider box" might be a local term for a specific type of junction box used in a particular application, like a wiring system for a home theater.

To get a clear understanding of what "electrical spider box" refers to, it's essential to have more context:

* Where did you hear the term? Knowing the context (e.g., a conversation, a website, a specific industry) can help narrow down the possibilities.

* What was it being used for? Was it being used in a residential, commercial, or industrial setting?

* What were the wires connected to? Knowing the purpose of the wires can help identify the type of box.

Without more information, it's difficult to give a definitive answer. If you can provide more details, I can help you understand what the term refers to.