IEEE C37.100.1-2018 pdf free download – IEEE Standard for Common Requirements for High-Voltage Power Switchgear Rated Above 1000 V.
3.3.6 Other special (unusual) service conditions
3.3.6.1 Exposure to damaging fumes, vapor, steam, oil vapors, salt air, and hot and humid climate
Equipment that may be exposed to damaging fumes, vapor, steam, oil vapors, salt air, and hot and humid climate should be protected. One or more of the following precautions should be considered:
1) Provision may be necessary to avoid condensation on all eletrical insulation and current-carrying parts
b) Insulation and bushings with extra creep distance may be required.
c) In cases where particular exposure represents a hazard to insulation integrity, special maintenance including insulator washing may be necessary.
d) Materials resistant to fungus growth may be required.
c) Installation in a positive pressure room system with appropriate filtration equipment may be required.
f) Installation of heaters in mechanism cabinets and indoor switchgear may be required.
3.3.6.2 Exposure to excessive dust or abrasive, magnetic, or metallic dust
Equipment that may be exposed to excessive dust or abrasive, magnetic, or metallic dust should be protected. One or more of the following precautions, a) through c), should be considered:
a) Totally enclosed non-ventilated equipment or compartments may be necessary.
b) Where curent-carrying equipment designed for ventilated operation is enclosed in a non-ventilated compartment, derating may be necessary.
c) Installation in a positive pressure room with appropriate filtration equipment may be necessary.
3.3.6.3 Exposure to explosive mixtures of dust or gases
Standard switchgear is not designed for use in explosive atmospheres. For this type of service, special consideration should be given in conjunction with requirements of applicable regulatory bodies so that acceptable equipment is selected.
3.3.6.4 Unusual space limitations
Unusual space limitations should be considered special.
3.3.7 Other parameters
Any other unusual or special environmental, operational, or other conditions prevailing at the location where switchgear is to be placed in service should be identified.
NOTE- For other spcial enironmental conditions, the user is rferred to IEC 60721-1 [B15]. IEEE C37.100.1 pdf download