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76 Maintenance
1. Repeat the steps described in section
start the work.
2. Open the cubicle door.
3. Undo the locking screws and open the swing-out frame or remove the shrouding.
4. Check the condition of the fuses. In case of a blown fuse, replace all fuses with similar
fuses.
5. Slacken the nuts of the headless screws of the fuses, and slide out the fuse blocks.
6. Make note of the order of the washers on the screws.
7. Remove the screws, nuts and washers from the old fuses and attach them to the new
fuses. Make sure to keep the washers in the original order.
8. Insert the new fuses into their slots in the cubicle. Pre-tighten the nuts of the new fuses
first by hand or by applying a torque of no more than 5 N·m (3.7 lbf·ft).
9. Tighten the nuts to torque as follows:
• Cooper-Bussmann fuses: 50 N·m (37 lbf·ft)
• Mersen (Ferraz-Shawmut): 46 N·m (34 lbf·ft)
• Other: Refer to the fuse manufacturer's instructions
1 0 . Close the swing-out frame, attach the shrouding (if any) and close the door.
Electrical safety precautions (page 35)
before you
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