Twofer

A twofer is a cabling device used in theatrical stage lighting. It allows two stage lighting instruments to be connected to one dimmer. It is wired in parallel, such that voltage is consistent throughout the circuit, and current is shared between the two instruments. Twofers can be used in conjunction with cables with the same types of connectors. The name is a corruption of the phrase "Two For One".

UK terminology

The UK equivalent of the twofer is a Grelco. The name derives from the manufacturer of the original examples, but is now generally adopted for all examples regardless of manufacturer. It typically relates to a splitter for the UK 15A power connections commonly used for stage lighting. It is usually an integral block rather than a plug with two cables leading to two sockets. Where a single plug goes to 3 or more sockets it is sometimes known as a Trelco.

Typically for most other power connector types used in theatre, the term (2-way) splitter is used.

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