3
B-01031 USBS
Manual (11-9-15)
Circuit Restrictions
The BREAK-SAFE® should not be used if the maximum voltage and/or amperage rating
of the tool can be exceeded. The BREAK-SAFE
®
is rated by maximum amperage and
voltage (kV). The table below details the specic ratings of the various BREAK-SAFE
®
models.
Model
Max System
Voltage
Maximum
Current Rating
Minimum
Conductor Size
Maximum
Conductor Size
USBS-15-1-PS
15 kV
300 A
#6 Copper 954 ACSR
USBS-15-2-PS
USBS-27-1-PS
27 kV
USBS-27-2-PS
USBS-46-1-PS
46 kV 200 A
USBS-46-2-PS
The BREAK-SAFE® has been tested to the full voltage and amperage rating for nominal
power factors of 70%-80% for both load break and load make applications. However,
the tool is rated by system voltages. For example, a 15 kV tool on a 15 kV system will
usually experience voltages of 15 kV / √3 or about 8.6 kV. It is at these actual (√3 ) system
voltage levels that the tool is rated for line charging and cable charging applications.
The BREAK-SAFE
®
USBS-15-1-PS and USBS-15-2-PS models have been tested at full
15 kV. This does not mean the tool is rated for phase to ground applications of a 27 kV
system. Use a 15 kV BREAK-SAFE
®
for 15 kV system voltages and below. Use a 27 kV
BREAK-SAFE
®
for 27 kV system voltages and below. Use a 46 kV BREAK-SAFE
®
for 46
kV system voltages and below.
The tool is designed to be used on three phase systems, but only on a single phase at a
time. Typical three phase applications require three separate tools.
Outlined below are some circuit restrictions known to exist:
• Do not utilize the BREAK-SAFE
®
tool in situations where ferroresonance
can produce over-voltage situations. An example of this involves switching
unloaded transformers that are delta-connected three phase and wyeconnected three phase with primary neutral ungrounded.
• The tool should never be used in phase-to-phase applications.
• Do not utilize the BREAK-SAFE
®
to switch unloaded transformers.
• Do not utilize the BREAK-SAFE
®
to switch capacitor banks.
! !
WARNING
ese instructions are not intended to replace or be a substitute
for proper safety training procedures. Failure to select the proper
tool in regards to minimum system requirements can result
in death, grievous personal injury and or equipment damage.
Table 1