Specifications

5
Safety Precautions
Indicator Line-up,
Precautions & Specifications
Please follow the following precautions when using Mitsubishi Electric products and be sure to carefully read the explanations
regarding safety precautions in the boxes marked “Caution.” In addition, ensure that any stickers or other items with relevant safety
information are delivered to the final user.
1. Precautions concerning usage environment and usage conditions
(1) Do not use in the following locations. Use in such locations may lead to malfunction or reduced service life.
· Locations where the ambient temperature is outside the range of -5 to +50°C.
· Locations where the average daily temperature exceeds 35°C.
· Locations where condensation or relative humidity is less than 30% or more than 70% (85% for electronic indicators).
 Moisture-proof treatment is available for high-humidity environments for some electrical indicator models. See page 10
of this catalog or contact a Mitsubishi Electric representative for details.
· Locations with excessive dust, corrosive gas, salinity, or oil fumes.
* Corrosive gases include sulfur dioxide, ammonia, hydrogen sulfide and other gases that corrode metal, plastic and other
materials.
 Supplementary anti-corrosion treatment is available for special environments for some electrical indicators. See page 10
of this catalog or contact a Mitsubishi Electric representative for details.
· Locations where indicators are subject to excessive vibration or shock.
 When used in a location subject to excessive vibration, moving parts may resonate and this may cause error and
fluctuation of indicated values. In such cases, apply anti-vibration measures to the installed panel or change the
installation location.
· Locations directly exposed to rain, water drops, ultraviolet rays, or sunlight.
· Locations at an altitude of 2000m or more for electric indicators or 1000m or more for electronic indicators.
· Locations with excessive external noise or radio waves.
· Locations where a large amount of static electricity is generated.
· Locations where there is a high level of waveform distortion or high-frequency waves caused by harmonic/thyristor circuits or
other means.
(2) Please consult a Mitsubishi Electric representative regarding the use of indicators for any of the following facilities.
· Nuclear power plants, medical devices, military facilities, airplanes or vehicles.
(3) The products in this catalog are not certified indicators.
They do not comply with the mandatory specifications for electrical meters as specified in the Measurement Act of Japan.
2. Mounting precautions
Please pay attention to the following items during installation.
For safety reasons, installation should only be performed by a professional electrical wiring technician.
· Mount the electrical indicators on metal panels.
· Mount on the panel in such a way that ensures the electrical indicator terminals and charged parts cannot be touched
accidently by an operator.
· Install the special accessories for T-100 and T-150 inside the panel. In addition, install them so that it is ensured the
accessories cannot be touched accidently by an operator.
· The screws for mounting onto the panel must be tightened by appropriate tools at torques appropriate for the screw size.
* Recommended tightening torques M3 screws: 0.48~0.98N·m
M4 screws: 0.98~1.47N·m
M5 screws: 1.47~1.96N·m
3. Connection precautions
Please pay attention to the following items when making connections.
For safety reasons, installation should only be performed by a professional electrical wiring technician.
· The metal panel must be grounded.
· Before using a voltmeter when connecting to a main power-supply circuit, make sure that an appropriate exterior fuse is
installed.
· Indicators that require an auxiliary power supply must not be directly connected to/use a main power supply. For these
indicators, use a power supply that is isolated from the main power supply circuit via a voltage transformer or other means.