How to Discharge a Capacitor

Step-by-Step Guide

1. 1

   Step 1: Learn and use proper techniques and equipment for working on live electrical equipment.

   Don't let your unprotected hands near anything involved.
2. 2

   Step 2: Disconnect the device with the capacitor from electric current.

   Alternating current will flow through a capacitor until the source of the current is removed.
   
   That current can add to the shock you'll get if you mishandle the capacitor, and may keep recharging it. , Most capacitors are constructed of 2 conductive plates separated by an insulating plate; more complex capacitors feature multiple layers of metalized plastic.
   
   Big capacitors, the kind most likely to be dangerous, are usually cylindrical and look roughly like battery cells. , This may prevent damage to the circuitry the capacitor was connected to when you discharge it.
   
   If it is removable, it is probably very large and potentially very dangerous. , Doing this will provide a path for the electricity to go and discharge the capacitor.
   
   You can use a 5- to 10-watt resistor, voltmeter, test light or ordinary light bulb.
   
   Using a meter or light will show the progress of the discharging, either with a digital display or a progressively dimming bulb.
3. 3

   Step 3: Look for the capacitor.

4. 4

   Step 4: Disconnect the capacitor from the system

5. 5

   Step 5: if it is not permanently installed.

6. 6

   Step 6: Touch a device to the capacitor leads for several seconds.

Detailed Guide

About the Author