PR electronics 5437 Manuel De Produit page 42

IS installation instructions
• Install in accordance with the US the National Electrical Code (NEC) or for Canada
the Canadian Electrical Code (CEC).
• Equipment that is FM-approved for intrinsic safety may be connected to barriers
based on the ENTITY CONCEPT. This concept permits interconnection of approved
transmitters, meters and other devices in combinations which have not been
specifically examined by FM, provided that the agency's criteria are met. The
combination is then intrinsically safe, if the entity concept is acceptable to the
authority having jurisdiction over the installation.
• The entity concept criteria are as follows:
The intrinsically safe devices, other than barriers, must not be a source of power.
The maximum voltage Ui (Vmax) and current Ii (Imax), and maximum power Pi
(Pmax), which the device can receive and remain intrinsically safe, must be equal to
or greater than the voltage (Uo or Voc or Vt) and current (Io or Isc or It) and the power
Po which can be delivered by the barrier.
• The sum of the maximum unprotected capacitance (Ci) for each intrinsically device
and the interconnect-ing wiring must be less than the capacitance (Ca) which can be
safely connected to the barrier.
• The sum of the maximum unprotected inductance (Li) for each intrinsically device
and the interconnecting wiring must be less than the inductance (La) which can be
safely connected to the barrier.
• The entity parameters Uo,Voc or Vt and Io,Isc or It, and Ca and La for barriers are
provided by the barrier manufacturer.
• The transmitter must be installed in a suitable enclosure to meet installation codes
stipulated in the Canadian Electrical Code (CEC) or for US the National Electrical
Code (NEC).
• If the enclosure is made of non-metallic materials or of painted metal, electrostatic
charging shall be avoided.
• Use supply wires with a rating of at least 5 K above the ambient temperature.
WARNING: Substitution of components may impair intrinsic safety
AVERTISSEMENT: la substitution de composants peut nuire à la sécurité intrinsèque
Division 2 / Zone 2, Non Sparking Installation
For safe installation of the 5431A.., 5434A.., 5435A.. and 5437A.. the following must be
observed.
Class I, Division 2, GP A,B,C,D T6...T4
Marking
Class I, Zone 2 AEx nA IIC, T6...T4 Gc
Class I, Zone 2 Ex nA IIC, T6...T4 Gc
NIFW, CL I, Div 2, GP A,B,C,D
42 5437V103-FR