Vertex Standard VZ-80 Operating Manual page 11

Do Not Substitute Options or Accessories
The Vertex Standard communications equipment
certified as intrinsically safe by the approving agency
(FM, UL, CSA, CENELEC), is tested as a complete
system which consists of the listed agency approved
portable, approved battery, and approved accessories
or options, or both. This approved portable and battery
combination must be strictly observed. There must be
no substitution of items, even if the substitute has been
previously approved with a different Vertex Standard
communications equipment unit. Approved
configurations are listed by the Approving Agency (FM,
UL, CSA, CENELEC).
The Intrinsically Safe approval Label affixed to a radio
refers to the intrinsically safe classification of that radio
product, and the approved batteries that can be used
with that system.
The manual PN referenced on the Intrinsically Safe
Approval Label identifies the approved accessories
and/or options that can be used with that portable radio
unit.
Using a non Vertex Standard intrinsically safe battery
and/or accessory with the Vertex Standard approved
radio unit will void the intrinsically safe approval of that
radio unit.
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