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HIGH VOLTAGE CABLE INSTALLATION AND
GE MEDICAL SYSTEMS
IMPORTANT! . . . XĆRAY PROTECTION
XĆray equipment if not properly
used may cause injury. AccordĆ
ingly, the instructions herein
contained should be thoroughly
read and understood by everyĆ
one who will use the equipment
before you attempt to place this
equipment in operation. The
General Electric Company, MediĆ
cal Systems Group, will be glad
to assist and cooperate in placing
this equipment in use.
Although this apparatus incorpoĆ
rates a high degree of protection
against xĆradiation other than the
useful beam, no practical design of
equipment can provide complete
protection. Nor can any practical
design compel the operator to take
adequate precautions to prevent
the possibility of any persons
carelessly exposing themselves or
others to radiation.
It is important that everyone having
anything to do with xĆradiation be
properly trained and fully acĆ
quainted with the recommendaĆ
tions of the National Council on
Radiation Protection and MeasureĆ
ments as published in NCRP
Reports available from NCRP PubliĆ
cations, 7910 Woodmont Avenue,
Room 1016, Bethesda, Maryland
20814, and of the International
Commission on Radiation ProtecĆ
tion, and take adequate steps to
protect against injury.
The equipment is sold with the
understanding that the General
Electric Company, Medical SysĆ
tems Group, its agents, and
representatives have no responsiĆ
bility for injury or damage which
may result from improper use of the
Various protective material and
devices are available. It is urged
that such materials or devices be
CAUTION: United States Federal
law restricts this device to use by or
on the order of a physician.
HIGH VOLTAGE CABLE INSTALLATION AND
GE MEDICAL SYSTEMS
If you have any comments, suggestions or corrections to the information in this document,
please write them down, include the document title and document number, and send them to:
GENERAL ELECTRIC COMPANY
MANAGER – INFORMATION INTEGRATION, AMERICAS W–622
P.O. BOX 414
MILWAUKEE, WI 53201–0414
CERTIFIED ELECTRICAL CONTRACTOR STATEMENT
All electrical installations that are
preliminary to positioning of the
equipment at the site prepared for
the equipment shall be performed by
licensed electrical contractors. In
addition, electrical feeds into the
Power Distribution Unit shall be
performed by licensed electrical
contractors. Other connections beĆ
tween pieces of electrical equipment,
calibrations, and testing shall be
performed by qualified GE Medical
personnel. The products involved
(and the accompanying electrical
installations) are highly sophistiĆ
cated, and special engineering
competence is required. In performĆ
ing all electrical work on these
products, GE will use its own
specially trained field engineers. All
of GE's electrical work on these
products will comply with the
requirements of the applicable elecĆ
The purchaser of GE equipment
shall only utilize qualified personnel
(i.e., GE's field engineers, personnel
of thirdĆparty service companies with
equivalent training, or licensed elecĆ
tricians) to perform electrical servicĆ
ing on the equipment.
DAMAGE IN TRANSPORTATION
All packages should be closely
examined at time of delivery. If
damage is apparent, have notation
damage in shipment" written on
all copies of the freight or express
bill before delivery is accepted or
signed for" by a General Electric
representative or a hospital receivĆ
ing agent. Whether noted or
concealed, damage MUST be
reported to the carrier immediately
upon discovery, or in any event,
within 14 days after receipt, and the
contents and containers held for
inspection by the carrier. A transĆ
portation company will not pay a
claim for damage if an inspection is
not requested within this 14 day
Call Traffic and Transportation,
Milwaukee, WI (414) 827-3449Ă/
8*285-3449 immediately after
damage is found. At this time be
ready to supply name of carrier,
delivery date, consignee name,
freight or express bill number, item
damaged and extent of damage.
Complete instructions regarding
claim procedure are found in
Section S" of the Policy &
REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSPECT HIGH VOLTAGE CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VERIFY CABLE AND RECEPTACLE COMPATIBILITY . . . . . . . . . . . . . . . .
INSERTING CABLES INTO X-RAY TUBES WITHOUT OIL SEALS . . . .
INSERTING CABLES INTO X-RAY TUBES WITH OIL SEALS
OR INTO HIGH VOLTAGE TRANSFORMERS . . . . . . . . . . . . . . . . . . . . . . . .
FINAL TIGHTENING AT X-RAY TUBE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aug. 15, 1997
Nov. 8, 2000
Corrected part # of spanner wrench to 46-404295G1.
i thru x
1 thru 8
This document defines a series of installation and hardware inspection procedures
that are directed at ensuring a uniform quality level for high voltage transmission on
X-Ray systems. Imperfections within the cable connections at the high voltage
transformer or X-Ray tube or internal defects within the cable itself cause high
voltage breakdown (arcing), intermittent filament operation, or mA drift.
A mechanically positive cable interface connection within a chemically homogeneous
dielectric media is required to facilitate proper and consistent electrical power
delivery to the X-Ray tube. Good intimate contact is necessary at all pin/socket
connections to preclude intermittent current flow or localized high voltage arcing
where significant voltage gradients exist. In addition, the connections must be
completely free of air pockets, foreign matter - especially metallic compounds, or any
chemicals that could alter or degrade the dielectric strength of the connection.
Internal cable resistance too must be bounded and consistent to achieve proper power
1. Tape or tag the cable near the terminal according to use as either ANODE or
CATHODE (C1 and C2 for Hexafocus applications) cable if it is not already
marked. If not certain, perform a continuity test with either an ohm or digital
volt meter (DVM).
2. Remove the protective sleeve from the cable end if it is new.
3. Remove the cable end from the receptacle, if system is not new, and visually
inspect the cable for black carbon tracks or bubbles in the insulation.
4. Clean the cable end with a lint-free cloth and an alcohol solvent. Use a
cloth to wipe dry.
5. Inspect for cracks around the terminals at the brass ring and in the body. Twist
the terminal body while holding the brass ring. The terminal should not spin
relative to the brass ring. If cracks exist or if the terminal spins the cable must not
6. Inspect the pins on the cable terminal. The slot on each pin must be clean over
the full depth. Set/Verify that the slot width is 0.5mm using spreading tool
7. Perform high voltage cable resistance checks as indicated to verify the proper
electrical characteristics for both new or installed cables. Table 1 gives these
RESISTANCE – GE HIGH VOLTAGE CABLE – 80i (See Notes 1 & 2)
Note 1: Null out the DVM and probe leads or subtract their resistance since this may
represent a significant portion of the reading. Remove both ends of the cable
from the receptacles to ensure proper measurements.
Note 2: Correction factors to be applied to all allowable resistance values for cable
lengths other than 80’ as follows:
D 20i multiply all resistance limits by 0.25
30i multiply all resistance limits by 0.38
40i multiply all resistance limits by 0.50
60i multiply all resistance limits by 0.75
70i multiply all resistance limits by 0.88
100i multiply all resistance limits by 1.25
120i multiply all resistance limits by 1.50
8. Inspect the high voltage cable for a broken braid (usually found at bends or cable
ends). Flex the cable along it's entire length, if possible, but at least at all bends
and end points and measure resistance. If either the braid is broken and/or any
resistance variance exceeds ±20% during flexing the cable must not be used.
1. Remove the protective Caplug" which seals the receptacle. Inspect the interior
of the receptacle to make certain it is clean and completely free of any foreign
matter. Remove any insulating compound, accumulated dust, or other foreign
matter with a clean lint-free cloth and an alcohol solvent. Use a cloth
to wipe dry.
2. Inspect the brass inserts at the bottom. Verify that a coiled contact spring is
visible in each pin socket.
3. Make a trial dry" insertion of the cable into the receptacle to test whether the
pins insert properly into the receptacle. Insert the terminal so the raised key of
the cable aligns with the mating notch in the receptacle. DO NOT FORCE.
4. Withdraw the terminal and recheck the cable pins.
If the pins are not scored from localized force fitting and the slot widths are
all uniform the cable end and receptacle are compatible and the assembly
process can continue.
If any pin is scored or the slot width on any pin is not uniform repeat Steps
3 and 4 in an attempt to favorably align the pin and receptacle bushing. This
refitting process may be necessary especially with new components.
If pin scoring or slot distortion continues, the cable end and receptacle are
incompatible and the assembly process cannot continue without corrective
action. Establish if the problem is with the cable end or receptacle and
replace that component.
1. Place the tapered rubber gasket over the terminal, wide end first, passing the
notch in the gasket over the orienting key on the terminal.
2. Apply a bead of silicone insulating compound (46-125224P3) along the cable
terminal up to the flared bushing. The bead diameter should be 7 mm minimum.
This can be achieved by dispensing the compound directly from the tube without
the auxiliary nozzle. Next, spread the compound bead into a thin, uniform
circumferential coat around the terminal, working any excess toward the pins.
(See Illustration 1).
BEAD FULL LENGTH
SPREAD BEAD EVENLY
FOR FULL COVERAGE
3. Apply compound at the end of the terminal to form a mound nearly as high as
the pins. Start at the CENTER and work outward to avoid forming air pockets
within the mound (See Illustration 2).
4. Remove the plastic cap from the X-Ray tube cable receptacle. Align the cable
terminal orienting key with the notch in the bushing and insert the dressed
connector. Keep centered in the receptacle so that no compound is scraped off.
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5. Maintain steady pressure on the terminal near the bottom of travel to allow the
silicone compound on the end of the terminal to creep and fill all of the voids.
Use hand pressure until the locking ring can be engaged.
6. Rotate the angled strain relief fitting as required to ensure proper thread
engagement and cable orientation. Tighten the locking ring by hand.
7. Begin tightening the ring in a slow manner with cable wrench 46-286957P1 or
507A935G1 for approximately one-half turn. At this point stop and wait
approximately ten seconds for the compound to creep and displace air within the
joint. Seat the ring to with spanner wrench 46-404295G1 to a torque of 11.1 ±
0.74 NT-M (15 ± 1 ft-lb).
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8. Loosen the cable locking ring WITHOUT disturbing the cable plug. Retighten
the locking ring to 11.1 ± 0.74 NT-M (15 ± 1 ft-lb).
1. Perform the inspection and preparation processes as indicated in Section 3.
2. Wet the rubber quad ring with transformer oil T0552G and install the ring into
the slot at the top of the X-Ray tube receptacle retaining ring. Note that this step
DOES NOT apply to the transformer receptacle.
3. Add 15 ml (1/2 oz. or approximately 1 Caplug") of transformer oil T0552G into
the receptacle. Do not overfill. The resulting depth is approximately 9 mm (.38I).
4. Align the cable terminal orienting key with the notch in the receptacle, keeping
it centered. Slowly insert the cable to engage the connector pins and to seat fully.
Oil should overflow slightly as insertion is completed showing that all air space
is filled. If there is no overflow, the cable is not fully seated or insufficient oil has
been used. Withdraw the cable and add oil if necessary.
5. Rotate the angled strain relief fitting as required to ensure proper thread
engagement and cable orientation. Engage the locking ring by hand and then
begin tightening it in a slow manner with cable wrench 46-286957P1 or
507A935G1. Tighten the ring using spanner 46-404295G1 and a torque wrench
to 16.2 ±Ă0.74 NT-M (22 ±Ă1 ft-lb). to seat the cable plug.
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6. Loosen the cable locking ring WITHOUT disturbing the cable plug. Retighten
the locking ring to 16.2 ±Ă0.74 NT-M (22 ±Ă1 ft-lb).
7. Remove residual oil trapped between the rubber quad ring and the locking ring.
Temporarily wrap the cable horns with paper toweling and hold in place with tape
for approximately 15 minutes. Remove toweling and wipe up any excess oil. Wipe
area with a clean towel dampened with cleaning solvent so that the surface is
sufficiently clean and dry to permit leakage detection.
After the integrity of the high voltage connection has been verified at the system level
in accordance with the defined tube run-in procedure (e.g., Advantx Unit X011) it is
necessary to seat the cable ring at an elevated temperature.
For a new tube unit installation, perform this step during the cooling interval in
the run-in and stability procedure.
For an existing tube unit, perform this step after the housing temperature has
been raised to approximately 38_ĂC (100_ĂF).
Loosen the cable locking ring WITHOUT disturbing the cable plug. Retighten the
locking ring to 16.2 ±Ă0.74 NT-M (22 ±Ă1 ft-lb).
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