10
HGL IOM Manual - Rev. B
HarmonicGuard
®
Low Capacitance
Installation
Fuse Specifications
Always refer to the drawings and other information shipped with your unit. Consult applicable wiring
codes, UL and NEC, for current limiting and disconnect requirements.
100 kA SCCR Fusing Requirements
See Table 1 for line fusing requirements that must be supplied to comply with the 100kA SCCR.
Table 1 – Customer Installed Line Fuse Requirements to comply with the 100kA SCCR
Voltage Size Customer Installed Line Fuse Requirements to Comply with the 100 kA SCCR
600
≤ 40
Use appropriately rated Class J, T, or L fuse less than or equal to 60 A
600
> 40 No requirement for SCCR
480
≤3
0 Use appropriately rated Class J, T, or L fuse less than or equal to 60 A
480
> 30 No requirement for SCCR
Provisional 480V Fuse Table
The fuse tables, provided below (Tables 2 and 3), show the fuse ratings of the included branch circuit
fuse internal to the HGL unit as a fuse replacement reference.
The fuse tables also show a typical line fuse or circuit breaker current rating for overcurrent protection,
given the unit’s nameplate power rating, if necessary, based on the installation. The line current fuses
listed below are typical values given the unit power rating, not required values. Line fusing ratings are
determined by the installer, based on input conductor sizing and protection required for downstream
equipment. Any drawings or documentation included with the unit literature kit take precedence over
the fuse tables below.
Note that to achieve a 100kA SCCR, the customer provided line fuse must be installed as per the
requirements in Table 1 and sized following NEC (National Electrical Code) guidelines for the source
conductors selected by the installer. The branch fuses are required to be installed at the shown ratings.
Summary of Contents for HarmonicGuard Series
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