A.3 Conditions of Use” for Ex Equipment”, Hazardous Location
Equipment or “Schedule of Limitations”:
a. Consult the manufacturer for dimensional information on the flameproof
joints for repair.
b. Painted surface of the RMA 800 series may store electrostatic charge and
become a source of ignition in applications with a low relative humidity less
than approximately30% relative humidity where the painted surface is
relatively free of surface contamination such as dirt, dust or oil. Cleaning of
the painted surface should only be done with a damp cloth.
c. The ambient temperature range, maximum process temperature and
applicable temperature class of the equipment is as follows:
RMA801: T4 for -50˚C < Ta < 85˚C
RMA803: T4 for -20˚C < Ta < 70˚C
d. The RMA800 series enclosure contains aluminum and is considered to
present a potential risk of ignition by impact or friction. Care must be
considered during installation and use to prevent impact or friction to avoid
impact.
e. If a charge-generating mechanism is present, the exposed metallic part on
the enclosure is capable of storing a level of electrostatic charge that could
become incendive for IIC gases. Therefore, the user/installer shall
implement precautions to prevent the buildup of electrostatic charge, e.g.
earthing the metallic part. This is particularly important if the equipment is
installed in a zone 0 location.
f. On installation, the RMA800 series shall be provided with supply transient
protection external to the apparatus such that the voltage at the supply
terminals of the RMA800 series does not exceed 140% of the voltage rating
of the equipment.
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