Is this groove cut directly into the masonry or is this just a space in between the plaster/lath and the brick wall?
If it's a groove in the masonry itself, I would say use conduit and fish wires through it - and use a masonry box as one of you guys told me some time in the recent past.
Colombian-style wiring for solid masonry houses (popular down there) is done using conduit and fishing individual conductors through the pipe.
Burying cable like that probably makes it a bear to replace in the future.
Just my opinion, but I'm not a licenced electrician.
[This message has been edited by SvenNYC (edited 12-05-2002).]