How safe is it to run bx electrical cable in concrete?

Answer for USA, Canada and countries running a 60 Hz supply service.

It is a violation of code. When pouring concrete there is often a lot of pressure, not to mention boots, placed on wireways in the pour. This could cause the coil of the bx to separate, exposing the conductors to metal edges and to the chemical reactions of the concrete.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.