Yes, but...

Splices must be in an electrical box and must be accessible. There are various ways this can be done.

• You can splice in an existing receptacle, switch or light box so long as it can be done without exceeding the box's wire capacity.
• You can splice in a junction box in an accessible part of the crawlspace or attic and put a blank cover on the junction box.
• You can splice in a junction box in the wall or ceiling and put a blank cover on that box. The cover can be painted or you can hang something or place furniture in front of the covered box, but you cannot drywall or otherwise finish over it.

Never splice wires without a box and never bury splices in a wall or inaccessible area, even if they are in a box! If there is ever a problem in the splice you want to be able to smell it before it becomes a fire, you want to be able to get to it to do something about it and if a connection ever overheats enough to start burning you want it to be contained in a closed box so it can't get enough air to support combustion.

Having a problem in a buried splice that was made by a building's previous owner creates at least an expensive headache for a new owner who doesn't know where to find the splice.

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