1. Fully visible, manual grounding devices should be provided to render capacitors safe while work is being performed.

2. Grounding points must be clearly marked.

3. Prevent transferring charges to other capacitors.

10.10.1.2.3 GROUND HOOKS

1. Conductor terminations should be soldered or terminated in an approved crimped lug. All conductor terminations must be strain-relieved within 15 cm.

2. Ground hooks must be grounded and impedance should be less than 0.1 ohms to ground.

3. The cable conductor must be clearly visible through its insulation.

4. A cable conductor size of at least #2 AWG should be used, and the conductor shall be capable of carrying the available fault current of the system.

5. Ground hooks shall be used in sufficient number to adequately ground all designated points.

6. Permanently installed ground hooks must be permanently grounded and stored in a manner to ensure that they are used.

10.10.1.2.4 DISCHARGE EQUIPMENT WITH STORED ENERGY IN EXCESS OF 10 JOULES

1. A discharge point with an impedance capable of limiting the current to 500A or less should be provided.

2. The discharge point must be identified with a unique marker (example: yellow circular marker with a red slash), and should be labeled "HI Z PT" in large legible letters.

3. A properly installed grounding hook should first be connected to the current-limiting discharge point and then to a low-impedance discharge point (< 0.1 ohm) that is identified by a unique marker (example: yellow circular marker).

4. The grounding hooks should be left on all of these low-impedance points during the time of safe access.

5. The low-impedance points shall be provided whether or not the HI-Z current-limiting points are needed.

6. Voltage indicators that are visible from all normal entry points should be provided.

10.10.1.2.5 FUSING

1. Capacitors connected in parallel should be individually fused, when possible.

2. Caution must be used in the placement of automatic discharge safety devices with respect to fuses. If the discharge will flow through the fuses, a prominent warning sign should be placed at each entry indicating that each capacitor must be manually grounded before work can begin.

3. Special knowledge is required for high-voltage and high-energy fusing.