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2 Fluke Corporation Fluke 1732 and 1734 Three-Phase Electrical Energy Loggers
Conduct multiple studies with
one instrument; download
while studies are in progress
via USB stick or Fluke Connect
mobile app.
Suitable for NEC 220 load studies
Load studies: Discover how much energy
individual pieces of equipment are consuming
when they are operating at minimum and
maximum capacity. Check capacity of circuits
prior to adding additional loads (various standards
exist for this process; in the US the NEC 220-
87 is the recommended standard). Load studies
can also identify situations where you may be
exceeding the allowable load on the circuit or
when an agreed peak demand applies from the
utility. For convenience, some load studies simply
measure current which makes installation of the
measuring equipment quick and easy. It is often
recommended that load surveys be performed
for 30 days so that all typical load conditions are
encountered during the test.
Energy assessments: quantify energy consump-
tion before, and after improvements, to justify
energy saving devices
Energy surveys: Users often ask where measure-
ments should be taken for an energy survey. The
answer is multiple points within the facility. Start
at the main service feeders; compare the power
and energy measured here with the readings
from the utility meter to ensure you’re receiving
the correct charges. Then move downstream to
the larger loads; these should be easy to iden-
tify by the current rating of the electrical panels
downstream of the service entrances. Measuring
at many points will allow a full picture of energy
usage across the facility to be developed. The
next question users typically have is how long an
energy survey should last. This of course depends
on the facility, but it is recommended that you
measure for a period that matches a typical facil-
ity activity period. If the facility operates over
a five day work week with down time on the
weekend, a seven day survey will most likely
capture typical conditions. If the facility operates
Applications
at a constant level for 24 hours a day, 365 days a
year, a single day could be reasonably represen-
tative as long as you avoid a period where there
may be planned maintenance.
To capture a full picture of the facilities energy
usage it is not necessarily required to have
measurements made simultaneously at every
consumption point in the facility. To get a com-
prehensive picture, spot measurements can be
made and then compared on a sliding time times-
cale. For example, you could compare the service
entrance results from a typical Tuesday between
6:00 am and 12:00 pm with those of a larger load
in the facility. Typically there will be some cor-
relation between these profiles.
Logging related analog measurements: When
conducting energy studies, it is useful to log
related analog measurements such as tempera-
ture, voltage, current or pressure. These variables
provide a better overall picture of operating
conditions and allow you to correlate asset
performance data with energy consumption.
Correlating these variables provides more of the
data you need to make cost saving performance
adjustments. With the Fluke 1734, up to two
Fluke Connect wireless modules can be used to
capture these measurements, and the values will
be automatically logged along with power and
energy readings.
Use up to two Fluke Connect wireless
modules with the Fluke 1734 to capture
analog measurements