100. INITIAL AND TEST ADJUSTMENTS 1. No watt-hour meter that has an incorrect register constant, test constant, gear ratio, or dial train, or that registers upon no load ("creeps") shall be placed in service or knowingly allowed to remain in service without adjustment and correction. A meter in service creeps when, with all load wires disconnected, the moving element makes one complete rotation in five (5) minutes or less.2. No watt-hour meter that has an error in registration of more than plus two (2%) or minus four (4%) per cent at light load, or plus or minus two (2%) per cent at full load, shall be placed in service or knowingly be allowed to remain in service without adjustment. Whenever on installation, periodic or any other test, a meter is found to exceed any one of these limits, it must be adjusted. Light load shall be approximately ten (10%) to twenty (20%) per cent the rated capacity of the meter. Full load shall be approximately one hundred (100%) to two hundred (200%) per cent of the rated capacity of the meter.3. Meters must be adjusted as closely as practicable to the condition of zero error. The tolerances are specified to allow for necessary variations, and meters must not be adjusted to the tolerance allowable.105. AVERAGE ERROR In tests by the Commission or utility, in response to complaints by the customer, the average error of a meter shall be determined by the following method: Take one-fifth of the algebraic sum of (1) the error at light load, (2) three times the error at normal load, and (3) the error at full load.
In determining normal load, the following percentages of the several classes of full-connected installations may be used:
| 1. | Residence and apartment building ..................................................... | 25% |
| 2. | Elevator Service .................................................................................. | 40% |
| 3. | Factories (individual drive), Churches, Offices .................................... | 45% |
| 4. | Factories (Shaft drive) theaters, clubs, hallways, entrances and general store lighting .......................................................................... | 60% |
| 5. | Restaurants, pumps, air compressors, lee machines, and moving picture theaters ................................................................ | 70% |
| 6. | Sign and window lighting, blowers and battery charging .................. | 100% |