MCS Switchboard specifications in accordance with ANSI C39.1
Accuracy: ±1.0% of full scale basic accuracy class.
Specific accuracies:
Expanded Scale Voltmeter - 0.3% of mid-scale.
Power factor meter - ±1% of fiducial value from 40-120% of rated current.
Synchroscope - ±1% of scale length.
Frequency meters - ± .15Hz @45-55Hz and 55-65Hz, ±0.08Hz 58-62Hz,
±1.3Hz @350-450Hz.
Position of use: Vertical (scale)
Full scale deflection angle: 250°, except synchroscope is 360°
Full scale length: MCS - 6.9 inches.
Scale plate: MCS platform type 2 piece scale with graduations on the outer
scale; numerals and legends on the inner scale.
Case: All MCS switchboard instruments have drawn steel case with matt
black powder coating.
Cover: Front cover has bezel & window made by one piece of flame retardant
Polycarbonate molding with black matte finished bezel area.
Mounting studs: 1/4" x 28 thread.
Terminal studs: 10-32 thread.
Operating temperature range: 0 to 40°C (32 to 104°F).
Storage temperature range: -10 to 50°C (14 to 122°F).
Extreme temperature range: -20°C to 65°C (-4 to 149°F).
Dielectric level: 2300VAC for 1 minute between the electrical circuit and
mounting studs.
Overload rating: AC & DC Ammeters – 1.2 x continuous, 10 x for 0.5 seconds,
repeated 10 times with 1 minute interval.
Ac & DC Voltmeters and frequency meters – 1.2 x continuous
Response time: 3 seconds maximum
