21 Changi South Street 1 Singapore 486777 Phone: +65 65420833 Fax: +65 65426920
E-mail: ductless@escoglobal.com Website:
www.escoglobal.com/ductless
USER SECTION
CHAPTER 3 – INSTALLING YOUR CABINET
3.8 ENVIRONMENTAL/ELECTRICAL CONDITIONS
This cabinet has been designed to be used under the following conditions:
ENVIRONMENTAL
1. Indoor use
2. Altitudes of up to 2000 meters (6600 ft)
3. 20% - 60% relative humidity
4. Temperature should be in between 20 degree C and 30 degree C (68 deg F and 86 deg F).
NB: It is recommended that the temperature in the laboratory be maintained within a +/-2 degree
C range under all conditions
5. Pollution Degree * : 2.0
ELECTRICAL
1. Installation Category ** : II
2. It is also recommended that the voltage does not fluctuate by more than +/- 2% of the nominal
voltage at any given time. Otherwise an electrical power stabilizer should be installed.
3. Electrical surge protector & back-up power supply (UPS) is strongly recommended for better
protection. If UPS is not used and there is a power failure, the operator would have to take
immediate measures to safeguard against any possible incidence of containment failure.
4. There should be unobstructed access to the main power plug on the power cord.
5. The leakage current for all electrical outlets put together should not exceed 2.0 mA.
6. At the time of carrying out the ‘Voltage dips & short interruptions immunity’ test, flickers were
observed in the fluorescent light and UV light whenever the voltage dips and short interruptions
were applied on the AC mains port of the cabinet. This condition got rectified automatically after
the test. The cabinet is considered to meet performance criteria B in ‘Voltage dips & short
interruptions immunity test’ based on the above observation.
* Pollution degree describes the amount of conductive pollutants present in an operating environment. In
Pollution degree 2, it is assumed that only non-conductive pollutants such as dust are present, except
that occasional conductivity is caused by condensation.
** Installation category (over voltage category) defines the level of transient over voltage that the
instrument is designed to withstand safely. It depends on the nature of electricity supply and the
cabinet’s over voltage protection means. CAT II is a category used for instruments which can be plugged
to a power point which is comparable to the public mains found in facilities such as hospitals, research
laboratories and industrial laboratories. The expected transient over voltage in CAT II is 2500 V for a 230
V supply and 1500 V for a 120 V supply.
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