Optical comparators are designed and manufactured so far as is reasonably practical to allow its safe operation when used in accordance with the safety instructions. Optical comparator must be used in position that does not constitute a hazard, where the operator and maintenance staff have free access to the control and maintenance of the equipment, and are not subject to any external hazards. Services should be conducted by an authorized person, to approved safety standards. The electrical supply should be taken from a correctly rated source.
Power requirements
The standard optical comparator is usually supplied to accept 110-120V AC, 50-60 Hz main power. It may also be configured to accept either 220-240V AC, 50-60HZ or 100V AC, 50-60Hz. Unless clearly labeled (next to the power input plug) optical comparators are configured for 110-120V AC, 50-60Hz. Listed below are wire color codes:
| 110-120V AC system | Brown/Black | Hot |
| Blue/White | Neutral | |
| Green | Ground | |
| 220-240V AC system | Brown/Black | Hot 1 |
| Blue/White | Hot 2 | |
| Green | Ground |
Note optical comparators must be plugged into an outlet rated at a minimum of 15A and must not be operated without an adequate ground connection.
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