PRODUCT LIABILITY ND-71548 (E)
PL- 8
Issue 2
2.2.5 Safety Environment
2.2.6 Temperature and Humidity
2.2.7 Air Conditioning Facilities
2.3 Notice Regarding Lightenning Strikes
WARNING
Consider countermeasures for disasters (such as firing, flood, and earthquake) and safety for
the operator. It is necessary to keep cleaning the machine room. Also, be careful of spraying
an insecticide not to affect the machinery.
WARNING Other than fulfilling the appropriate humidity and temperature, it is necessary to consider the
maintenance operation and the all-time ventilation in non-loading operation during day-off
and night. For example, when the height above floor is 1 m (3.281 feet), the temperature
should be from 20 to 25 ℃ (68 to 77 °F ) and the humidity should be more or less 50 %.
WARNING
The power and installation of air conditioners must be different from those of PBX.
To keep electromagnetic arc from making noise, attach surge limiting capacitor and resistor
on the coil of the electromagnetic switch.
It might be necessary to adjust the ventilation to be air conditioned equally through the
machine room.
In the case of using duct or ceiling air conditions, do not place PBX in the location where the
dew might fall.
If PBX is installed in the location near the ventilation, the PBX might be damaged due to the
air containing humidity and exhaust.
WARNING It is necessary to take proper procedures to avoid damage to the PBX caused by local lightening strikes
and other electrical surges.
As for grounding conductors, there needs to be two-type grounding conductors; one is below 10 Ω
(Type 1) and the other is below 100 Ω (Type 2). In particular, the Type 1 is used for the electronics
circuit installment, therefore, it must be used as isolated system to keep from electricity difference
caused by lightening strikes.
The Type 1 is used when connecting the FE of PBX, the PE of Main Power, MDF, etc.
Extract the ground terminal (grounding electrode of three terminals) from the earth board same with
that of the main equipment. The ground terminal attached with AC100V plug outlet is used for MAT,
printer, MODEM, and measurement machine for maintenance.