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Section 7 Electrical Requirements
Before installing the generator set, provide for electrical connections through conduit to the transfer switch and other accessories for the generator set. Carefully install the selected generator set accessories. Route wiring to the generator set through flexible connections. Comply with all applicable codes when installing a wiring system.
AC circuit protection. All AC circuits must include circuit breaker or fuse protection. Select a circuit breaker for up to 125% of the rated generator set output current. The circuit breaker must open all ungrounded connectors. The circuit breaker or fuse must be mounted within 7.6 m (25 feet) of the alternator output terminals.
7.1 Batteries
Batteries should be located in a clean, dry area. Position them so that the caps are readily accessible for checking the electrolyte level. Keep batteries out of areas subject to high temperatures. Locate them close to the set to keep cables short and thus insure maximum output. Several types of battery racks are used throughout the product
Starting batteries are usually
20kW. For larger models, three
Nickel cadmium batteries are sometimes used for standby generator sets because of their long life (20 years). This is offset by their high initial cost, larger space requirements, and special charging requirements. Conventional
Batteries are charged by
period of operation. When the engine is not operating, a very low charge rate from an
The most common reason for the failure of an emergency generator set to start when needed is starting battery failure. Two common causes of battery failure are: a manual charge rate set too low to maintain the battery, or a manual chase rate set too high, which results in loss of battery electrolyte. For this reason, automatic float chargers, which vary the charge rate in response to battery condition, are strongly recommended over manual types.
For large engines using two starters, either one bank of batteries and chargers for both starters, or separate battery systems may be used. The latter system is preferable since it reduces the chance of one component’s failure making the entire system inoperative.
Battery cables. A
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1. | Battery cables |
2. | Battery secured in mounting rack |
3. | End view |
4. | Generator set skid |
Figure
Section 7 Electrical Requirements 35 |