User's Guide

For your safety 15
certified by both the approval authority and by Tait Limited.
Any unauthorized repair or substitution of parts invalidates
the intrinsic safety or non-incendive rating and the third
party IS or NI approval. To have an IS and NI radio
serviced, return it to your regional Tait office.
Rating matching
The rating of the radio, battery and accessories must be
reviewed to ensure a safe IS/NI radio system. IS/NI
ratings must be “matched”, and the lowest approval level
determines the overall IS/NI radio system approval.
Equipment labels clearly identify the item’s ratings.
Zone ratings
■ Use only Gas Group IIC batteries with Gas Group IIC
radios.
Use only Gas Group IIA batteries with Gas Group IIA
radios.
■ Gas Group IIC rated accessories may be used with
IIA radios, but the combination may only be used in a
IIA Gas atmosphere.
■ Gas Group IIC and Dust Group IIIC rated accessories
may be used with Gas Group IIC or IIA radios, but the
combination may only be used in a gas atmosphere.
■ Gas Group IIC rated radios and accessories may be
used in Gas Group IIB or IIA areas.
■ Zone 1 rated radios and accessories may be used in
Zone 2 areas.
■ Any item approved to Gas Group IIA will limit the
radio system to a Gas Group IIA area. For use in a
Gas Group IIC area, all items must be approved to
Gas Group IIC.
Division ratings
■ Use only Group D battery with Group D radios.
Use only Group A, B, C, D battery with Group A, B, C, D
radios.
■ Gas Class I and Dust Class II and Class III rated
accessories may be used with Gas Class I radios, but