Siemens JFR Distribution Step Voltage Regulator 21-115532-001 - Manual (Page 7)

INTRODUCTION
Page 3
PHYSICAL CONSIDERATIONS
• Handling. Type JFR regulators are designed to be lifted
either by a forklift at the base or by use of lifting hooks
on the side of each tank. Each JFR regulator is provided
with either 2 or 4 lifting hooks on the side of each tank.
The number of hooks has been established to provide a
margin of safety. Use all supplied lifting hooks when
lifting.
• Location. Type JFR regulators are designed for outdoor
installation. Any regulator may be platform or pedestal
mounted. Regulators provided with hanger brackets are
suitable for pole mounting. When the regulator is to be
installed in a substation on a pedestal it is recom-
mended that a minimum elevation to the live connection
be established, as required by applicable codes.
Elevation. When the regulator will be used at an elevation
above 1000 meters (3300 feet) the kVA rating must be de-
rated per ANSI C57.15 to assure operating temperature
limits are not exceeded.
LINE TERMINALS AND
CONNECTIONS
Type JFR voltage regulators are routinely equipped with line
bushing terminals per the following criteria.
Nameplate Line Current
Rating
Conductor Size Range
or Threaded Stud Size
50A to 300A #2 to 477 MCM
301A to 668A #2 to 800 MCM
669A to 1200A 1.125- 12 UNF-2A
1201 A to 2000A 1.500- 12 UNF-2A
Clamp type terminals for use through 668 ampere are
capable of accepting an aluminum or copper conductor.
Tank grounding provision consists of a 0.5-13NC tapped
hole in a steel pad for regulators rated to 300 amperes.
Above 300 ampere ratings, a stainless steel pad with two
0.5-13NC tapped holes is provided.
ELECTRICAL CONSIDERATIONS
Type JFR regulators are commonly installed using any of
four electrical configurations.
• One regulator in single-phase application. (Figure 4A)
• Three regulators in wye on a grounded-neutral three-
phase system. (Figure 4D)
• Two regulators in open delta on a three-phase
ungrounded system. (Figure 4B)
• Three regulators in closed delta on a three-phase
ungrounded system. (Figure 4C)
Each of the four alternatives, when complete with switching
provisions, will take the electrical configuration as shown
on the next page.
The descriptions 'S', 'L', and 'SL' are embossed into the cover
for user convenience at time of installation.
Improper use of lifting provisions can cause death,
serious injury, or equipment damage.
To prevent:
Do not use cover lifting eyes to lift complete unit.
Cover lifting eyes are for untanking only.
WARNING
Hazardous voltage present at the line terminals of the
bushings on the cover of the regulator.
Will cause serious injury or death.
To prevent:
De-energize the regulator before servicing.