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Appendix 1: FM-CSA Installation Drawing
Installation notes:
FM / CSA:
For installation in the US the equipment shall be installed according to the National
Electrical Code (ANSI-NFPA 70).
GB
For installation in Canada the transmitter shall be installed in a suitable enclosure to meet
installation codes stipulated in the Canadian Electrical Code (CEC).
The entity concept:
Equipment that is FM / CSA-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 / CSA, provided that the agency's criteria are met. The combination is
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 U
which the device can receive and remain intrinsically safe, must be equal to or greater
than the voltage (U
be delivered by the barrier.
The sum of the maximum unprotected capacitance (C
the interconnecting wiring must be less than the capacitance (C
connected to the barrier.
The sum of the maximum unprotected inductance (L
the interconnecting wiring must be less than the inductance (L
connected to the barrier.
The entity parameters U
ded by the barrier manufacturer.
FISCO/FNICO rules:
The FISCO Concept allows the interconnection of intrinsically safe apparatus to
associated apparatus not specifically examined in such combination. The criterion for
such interconnection is that the voltage (V
intrinsically safe apparatus can receive and remain intrinsically safe, considering faults,
must be equal or greater than the voltage (U
power (P
) which can be provided by the associated apparatus (supply unit). In addition,
o
the maximum unprotected residual capacitance (C
ratus (other than the terminators) connected to the Fieldbus must be less than or equal
to:FISCO: 5 nF and 10 µH
FNICO: 5 nF and 20 µH
Installation Drawing 11175631.01
28
(V
) and current I
i
max
or V
or V
) and current (I
o
OC
t
, V
or V
and I
o
OC
t
WIKA Operating Instructions Temperature Transmitter T53
(I
), and maximum power P
i
max
or I
or I
) and the power Po which can
o
SC
t
) for each intrinsically device and
i
) for each intrinsically device and
i
a
, I
or I
, and C
and L
o
SC
t
a
), the current (I
max
max
, V
, V
), the current (I
o
OC
t
) and inductance (L
i
(P
),
i
max
) which can be safely
a
) which can be safely
for barriers are provi-
a
) and the power (P
) which
i
, I
, I
) and the
o
SC
t
) of each appa-
i
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