Installation manual

FuelMaster
®
Installation Manual
17
intrinsically safe or must be enclosed within an explosion-proof enclosure. Intrinsically safe devices
are generally limited to very low voltage and low current devices, such as that portion of a pulser
before the barrier. Examples of explosion-proof enclosures are rigid metal conduit, and junction
boxes and conduit fittings approved for use in hazardous locations. If the electrical device is not
intrinsically safe, or is not explosion-proof, then it must be installed outside the hazardous area.
Figure 1-2 illustrates an FMU and the distance from its mounting surface to where electrical
components are installed. All internal electrical components are 28 inches above the mounting
surface. This places all electrical components in the FMU a full 10 inches outside the hazardous
location. This 10 inch separation provides additional spacing for the installation of outlet boxes or
other nonexplosion-proof devices which cannot be installed in hazardous locations.
FuelMaster
®
has been certified for use in electrical installations in Canada and Europe. FMUs
certified for use in Canada and Europe may be identified through the ID plate riveted to the FMU
pedestal. See Figure 1-3 for examples of FMU ID plates for Canadian and European certification.
FuelMaster
®
has also been certified by the National Conference on Weights and Measures, and has
NTEP (National Type Evaluation Program) Certificate 02-115. The NTEP certificate applies to the
FMU-2500 and FMU-3000 series, and is referenced on the FMU ID plate. The series covers FMU-
2500 classic and Plus FMUs, and FMU-3000 and FMU-3500 passive FMUs.
Figure 1-2. FMU Electrical Safety Spacing
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