FloBoss 407 Instruction Manual
1-8 Rev 5/00
The National Electrical Code Article 250-95 (1993) defines the size requirements for equipment
grounding conductors.
Proper grounding of the FloBoss 407 helps to reduce the effects of electrical noise on the units
operation and protects against lightning. Lightning Protection Modules (LPM) are available to provide
additional lightning protection for field wiring inputs and outputs. A surge protection device installed at
the service disconnect on line-powered systems offers lightning and power surge protection for the
installed equipment.
All earth grounds must have an earth to ground rod or grid impedance of 25 ohms or less as measured with
a ground system tester. The grounding conductor should have a resistance of 1 ohm or less between the
FloBoss 407 case ground lug and the earth ground rod or grid.
The grounding installation method for the FloBoss 407 depends on whether the pipeline has cathodic
protection. On pipelines with cathodic protection, the FloBoss 407 must be electrically isolated from the
pipeline.
Electrical isolation can be accomplished by using insulating flanges upstream and downstream on the
meter run. In this case, the FloBoss 407 could be flange mounted or saddle-clamp mounted directly on the
meter run and grounded with a ground rod or grid system.
Another way of providing electrical isolation would be to mount the FloBoss 407 on a pipestand and use a
remote Multi-Variable Sensor installed with non-conductive conduit. Ground the case of the FloBoss 407
to a ground rod or grid system.
On pipelines without cathodic protection, the pipeline itself may provide an adequate earth ground and the
FloBoss 407 could mount directly on the meter run. Test with a ground system tester to make sure the
pipeline to earth impedance is less than 25 ohms. If an adequate ground is provided by the pipeline, do not
install a separate ground rod or grid system. All grounding should terminate at a single point.
If the pipeline to earth impedance is greater than 25 ohms, the FloBoss 407 installation should be
electrically isolated and a ground rod or grid grounding system installed.
1.4.6 I/O Wiring
I/O wiring requirements are site and application dependent. Local, state, or NEC requirements
determine the I/O wiring installation methods. Direct burial cable, conduit and cable, or overhead
cables are options for I/O wiring installations. Sections 2 and 3 contain detailed information on
connecting I/O wiring to the FloBoss 407.
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