Let me teach you how to easily repair and remove conduit for electric wires.
For the full guide and more tips read the post in 123 Do It Yourself blog: http://123doityourself.wordpress.com/2014/01/22/22/
Step 1: Shut Off the Electricity Flow
This step is the most important one for your own safety.
Step 2: Disconnect the Wires Near the Damage
Step 3: Pull One End of the Wires Out of the Conduit
Step 4: Unscrew or Use Pliers to Remove Conduit Supports
Step 5: Unscrew the Electrical Conduit Fittings
use a wrench to unscrew the electrical conduit fittings on both ends or use a pipe cutter or conduit saw to cut out the damaged section of conduit (depends on the size of the damage). Cut a couple of cm extra into the undamaged parts of the conduit.
Get rid of conduit pipes that were damaged
Step 6: Measurements
Measure the size of the part needed to be replaced
Step 7: Cut a Part of Conduit Tubing
With a pipe cutter or conduit saw.
Step 8: If Possible - Pull Cables Out of the Conduit
Step 9: Place the Wire in the New Conduit
Step 10: Screw Tightly
Screw tightly electric conduit connectors over your cut piece of conduit and over the existing conduit on both sides using a wrench
Step 11: Screw Back the Conduit Supports
Step 12: Pull the Wire
Pull the wire through the conduit using a threading tool.
Step 13: Reconnect the Wires to There Original Place
Step 14: Turn the Electricity Back On
Step 15: Get More Tips and Tricks
You are more then welcome to read the full guide with more tips and tricks, for example, how to make the job much easier by attaching a fishing tape to the wires. Learn how to uninstall conduit calbes