3M 1402-XR Installation Manual

Recommendations for
Marking Power Facilities

with the Use of 3M™ EMS Electronic
Markers

1.0 Overview

Revised June 21, 2005 Page 1of 12

The 3МTM electronic marker system is intended to make the job of precisely
locating underground facilities easier and faster. The basic component of the system
is a durable electronic marker buried above key underground elements in the
process of their construction or maintenance. A stand-alone 3M™ Dynatel

TM

marker

locator model 1420, an integrated 3M™Dynatel cable/marker locator 2200M-ID
series or a 3M

TM

Dynatel

TM

cable locator 2200 series combined with a 3MTM DynatelTM
EMS Accessory 2205/2206 provides fast and accurate location of a marker many
years after its placement

Depending on the resonant frequency and the color, electronic markers are
used to mark a wide range of underground facilities such as power supply lines,
cable television networks, telecommunication lines, water supply pipelines,
wastewater pipelines, oil and gas pipelines, and so on.

The solid red marker that is used for general power applications. These are
tuned to 169.8 kHz and are available in 4 different form factors for varying
applications.

Power markers consist of a sealed shell containing a passive antenna – a
low-frequency resonance circuit tuned to the 169.8 kHz frequency. The locator
sends a signal to the passive marker that energizes it, this signal is reflected back to
the locator. Electronic markers are immune to congestion and extremely reliable.
Electronic markers are typically installed during construction when the facility is
visible to the eye, making it one of the most trusted methods for positive
identification of buried facilities.

2.0 General Recommendations for Electronic Marker placement

Revised June 21, 2005 Page 2of 12

2.1 Recommended placement

• All ‘Items of Plant’ that are assigned unique reference numbers on facility maps and

records.

• Handholes

• Buried splices of all types

• Buried transformers

• Repair points

• Buried service drops - Service stubs

• Slack loops

• Depth changes

• Laterals

• Bends - Changes of direction, arcs

• Conduit stubs

• Encasement ends - Conduit ends of horizontally directional drilled (HDD) facilities

• Path of deep facilities installed using trenchless (HDD) construction technology

• Manhole covers

• Water crossings

• Major road crossings

• Rail crossings

• Utility crossings – locations where the cable crosses over or under other utilities.

• Contractors shall certify in writing that Electronic Markers are in place, prior to paving

over any of the above locations. Electronic Markers that are found to be missing shall
be installed at the Contractors expense.

• Using the GPS interface on the 3M™ Dynatel™ Locator model 1420 and 2200M-ID

series will also provide positive verification of marker placement during construction and
direct data import capability to leading industry standard GIS systems for electronic map
updating

.

Revised June 21, 2005 Page 3of 12

3.0 Recommended Marker Spacing and Depth

3.1 Recommended Depth for Ball Markers

• Maximum distance from ground surface to marker is as follows:

TM

3M

Ball Marker model 1422-XR/ID

o 4ft. (1.2 m) read range using CE approved (export) versions of 3M marker

locators

o 5ft (1.5m) read range using US version of 3M marker locators

TM

3M

Ball Marker model 1402-XR

o Maximum installation depth – 5ft. (1.5m) detection range

• To increase detection area on surface, it is recommended to place the marker at

half if it’s rated depth. This will produce a detection area of approximately 6ft.
(2 meters) in diameter.

• If fill to finish grade is anticipated, place marker at a 2ft. (0.5m) depth, this may

vary depending on the amount of fill required.

• If a cut to finish grade is anticipated, place marker at its maximum rated distance

of 4ft. (1.2m) for CE models and 5ft. (1.5m) for US models.

• If it is anticipated that there will be a need to reprogram the ID marker after it has

been buried, place marker at a maximum depth of 1ft. (0.3m).

3MTM Ball Marker
model 1422-XR/ID

5ft. (1.5 meter) Maximum

- US Versions

1.2 meter (4 Ft) Maximum

- CE Versions

Power Line

4in.

(10 cm)

Minimum

Bedding

3.2 Spacing to Utility

• Place ball marker at a distance of at least 4in. (10cm) from the facility.

4 inches

(10cm.)

Revised June 21, 2005 Page 4of 12

3.3 Spacing Between Markers

• Minimum distance between markers should be at least 6ft. (2 meters) for clear

identification.

• In straight sections for path marking applications, it is recommended to place

markers adjacent to existing above ground landmarks such as telephone or
power poles to simplify future locating. Markers should be placed where there is
direct line of sight to the next marker. Recommended 400ft. (100m) maximum
distance between markers with a preferred distance of 200ft. (50m) between
markers.

• In bends or lateral deflections, it is recommended to place one marker for every

1ft. (0.3m) deflection (arc) to accurately indicate cable position. Minimum
spacing between markers should not be less than 6ft (2m).

4.0 Standard Tie Down Procedure

1. Before placing the ball marker over the key point, decide if a tie down procedure
is necessary to keep it in place. If so, secure the marker by inserting a cable tie
through one or both tie-down tabs and to the key point.

2. If the key point is metallic, we recommend that the ball marker be separated
from it with a minimum of 4in. (12cm) of clean fill dirt.

3. Hand fill at least 6in. (15cm) of soil over the marker.

4. Backfill the hole.

Revised June 21, 2005 Page 5of 12

4.1 Alternate Tie Down Procedure – For deeper facilities

Tie to steel rebar

3MTM Ball Marker

model 1422XR/ID

Attach using tywrap or tape

1.2m (4ft.)

US Models

5ft. (1.5m) maximum -

Maximum - CE Models

Rebar

Power Line

Bedding

10in.

(25cm.)

Nominal

Revised June 21, 2005 Page 6of 12

5.0 Additional Placement Recommendations for 3MTM Ball Marker 1422-XR/ID

Additional applications are possible with the XR/ID series of Ball Markers due to their
ability to store and convey specific facility information. Known applications for ID ball
markers in power applications are shown below.

Ball Markers mark the following

points

• All ‘Items of Plant’ that are assigned
unique reference numbers on facility
maps and records.

• Handholes

• Splice boxes

• Buried splices of all types

• Buried transformers

• Repair points

• Buried service drops - Service stubs

• Depth changes

• Laterals

• Tee’s

• Bends - Changes of direction

• Depth changes - Lateral Deflection

• Conduit stubs

• Encasement ends - Conduit ends of

horizontally directional drilled (HDD)
facilities

• Path of deep facilities installed using
trenchless (HDD) construction
technology

• Manhole covers

• Manhole corners

• Water crossings

• Major road crossings

• Rail crossings

• Utility crossings – locations where the

cable crosses over or under other
utilities.

• Contractors shall certify in writing that
electronic markers are in place, prior to
paving over any of the above locations.
electronic markers that are found to be
missing shall be installed at the
contractors expense.

• sing the GPS interface on the 3M
Dynatel
2200M-ID can simplify mapping and
provide additional guidance to field
personnel for positive verification of
marker placement.

TM

locator models 1420 and

TM

Facility information that may be of value to

program into the ID Ball Marker

• Facility owner

• Description of facility point (see left column)

• Item of plant identification number (IPID)

• Conductor size

o # KCMIL
o # MCM
o # AWG

• Type of insulation and jacket

o XLP – Cross linked polyethelyne
o EPR - Rubber
o Paper Lead

• Type of splice

o Y splice
o Straight splice
o Transition splice
o 1 way or 3 way splice
o Paper to Poly splice (transition splice)

• Voltage

• Depth (to facility, or from marker to facilty)

• Address – for service drops

• Direction

• Distance or Length

• Date of installation or repair

Revised June 21, 2005 Page 7of 12

6.0 Types of 3М™ EMS Electronic Markers for power applications

3M offers a complete line of electronic markers that provide solutions supporting a
variety of power applications.

6.1 3M™ Ball Marker model 1402-XR

The patented self leveling design of 3M™ ball marker model 1402-XR aligns the
marker coil inside the ball in a horizontal position regardless of
how they are placed in the ground. The marker shell is made
from a high-strength plastic, which protects the device from
mechanical and weather damage. The marker contains an
antenna molded inside a water-resistant plastic disc, which is
free-floating on the surface of a nonfreezing liquid. 1402-XR
ball markers are used in to mark points of special interest that
may need to be accessed in the future. In power applications
where there is a need to mark non-metallic empty conduit, the
1402-XR ball marker can be used for path marking.

• Shell diameter – 4in. (100mm)

• Maximum installation depth – 5ft. (1.5m) detection range

• Minimum distance from the facility– 4in.(10cm) from the ball center

6.2 3M™ Ball Marker model 1422-XR/ID

This marker is similar to the 1402-XR ball marker in size and form. Additionally, the
1422-XR/ID ball marker contains an RFID microchip, which allows introduction and
storage of facility data. Each marker comes pre-programmed with a unique 10 digit
identification number. This pre-programmed number is also attached to the marker
on a removable bar-coded tag,

which can be peeled off before installation and

attached to facility maps. Please reference section 5.0 of this document for a
comprehensive listing of known applications for this marker in Power applications. In
general terms, 1422- XR/iD ball markers are ideal for marking underground facilities
in urban areas with a high density of underground networks, in rural areas where
there are few physical landmarks that can be referenced in maps, and for marking
facilities that can not be located or are difficult to accurately locate using traditional
electromagnetic cable locating techniques. Additionally, 1422-XR/ID ball markers
are ideal for marking high value facilities or lifeline facilities where service outages
would have significant impact and cost or hardship.

• Shell diameter – 4in. (100mm)

• Maximum installation depth:

o 1.2 m (4ft.) read range using CE approved version of 3M marker locator
o 5ft (1.5m) read range using US version of 3M marker locator

• Minimum distance from the facility– 4in. (10 cm) from the ball center

6.21 Spacing of ball markers to buried facility

4 inches

(10cm.)

Revised June 21, 2005 Page 8of 12

6.3 3M™ Disk Marker model 1412-XR

Model 1412-XR disk markers are used in handhole applications where they are
attached mechanically to the top cover of hand hole boxes. 1412-XR disk markers
are identical in performance to the 1402-XR ball marker. 1412-XR disk markers are
not intended for direct bury applications or applications where they would be
attached to solid metal manhole covers.

• Shell diameter – 4in. (100mm)

• Marker height – 0.7in (1.8cm)

• Maximum installation depth – 5ft. (1.5m) detection range

6.4 3M™ Near Surface Marker model 1433

Recommended for urban applications, near-surface markers
allow for convenient marking facilities of under asphalt or
concrete or for marking facilities after construction has
completed. The marker is installed vertically at a small depth in
a hole drilled or gouged in soil or in street pavement. Near
surface markers are also ideal for path of facilities installed
using trenchless (HDD) technology. In recent years, near
surface markers have become increasingly popular for marking
existing or legacy facilities due to their ease of installation.

• Case diameter – 0.8in (20mm), Case length - 3in. (76mm)

• Maximum installation depth – 2ft. (0.6m)

• Minimum vertical distance from facility – 2in. (5cm)

• Minimum horizontal distance from facility – 1in. (2.5cm)

6.41 Spacing of near surface marker to buried facility

Near - Surface

1433 Power

Near - Surface

1433 Power

2in (5cm)

1in. (2.5cm)

Revised June 21, 2005 Page 9of 12

6.5 3M™ Mid Range Marker model 1256

Model 1256 mid range markers are used in areas with low-density underground
facilities as point markers for items of special interest such as splices, repair points,
slack loops, service stubs and as guides for marking linear segments of the paths of
long cables that are deeper than be accommodated with the 3M
1400 series ball markers. The 1256 mid range marker is often
used in larger ‘point’ excavations but not typically used in narrow
trench applications due to its’ larger diameter.

• Case diameter – 8.4in. (210mm)

• Case height – 1.2in. (30 mm)

• Maximum installation depth - up to 6ft. (1.8m)

• Minimum distance from the facility to marker - 4in. (10cm)

6.51 Spacing of mid range marker to buried facility

4 inches

(10cm)

6.6 3M™ Full Range Marker model 1251

The full range marker is designed for marking deep
underground facilities. Its large diameter is also valued by
facility owners as a ‘dig shield’ that can protect the facility from
damage from being cut or damaged by a shovel during
excavation. When placed above the facility, the full range
marker serves as a dig shield or cover, which warns of
encroachment to the underground facility.

• Case diameter – 15in.(380mm)

• Case thickness – 0.7in.(17mm)

• Maximum placement depth – up to 8ft. (2.4m)

• Minimum distance from the facility marked – 6in.(15cm)

6.61 Spacing of full range marker to buried facility

Revised June 21, 2005 Page 10of 12

7.0 3M™Dynatel™ Electronic Marker Locators

3M™Dynatel™ Marker Locators are recommended for locating 3M™Electronic
Marker System markers. 3M offers stand-alone EMS locators – Models 1420 (US)
and 1420E (CE approved for export). Additionally 3M offers integrated cable
locators with EMS locating capabilities, the 2200M-ID series. The 3M™Dynatel™
2200M-ID series locators provide a single integrated platform for what has
previously been two separate test sets. This can reduce the initial capital
expenditure, the number of pieces of equipment that need to be maintained, space
requirements in the vehicle and number of test sets that have to be carried by a
technician into the field to perform a locate. 3M has recently introduced an interface
for these units to communicate with selected GPS receivers which can improve
efficiencies in documenting as-built facilities and reduce the need for inspection.
3M™Dynatel™ offers the following electronic marker and multi-purpose locators.

Model 1420/1420E Model 2250M/2250M-ID Model 2273M/2273M-ID

With GPS interface

Additional information about 3M™ Dynatel™ cable and electronic marker locating
products for power applications is available at

http://www.3m.com/dynatel or

contact your local 3M sales professional.

Revised June 21, 2005 Page 11of 12

Important Notice

All statements, technical information, and recommendations related to 3M’s products are based on information believed to be
reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must evaluate it and determine if
it is suitable for your intended application. You assume all risks and liability associated with such use. Any statements
related to the product which are not contained in 3M’s current publications, or any contrary statements contained on your
purchase order shall have no force or effect unless expressly agreed upon, in writing, by an authorized officer of 3M.

Limited Product Warranty

All 3M CMD products, test and measurement instruments (except accessories), manufacture dated test leads, and
rechargeable batteries will conform to 3M’s published specifications and will be free from defects in material and manufacture
for a period of twelve (12) months from the date of purchase. Dry cell batteries included in any of 3M’s products are
warranted only to the extent the battery manufacturer determines such batteries are covered by its warranty. Accessories for
test and measurement instruments are warranted for ninety (90) days after purchase. 3M’s
obligations and liability under this warranty are limited to repairing, replacing or refund of the purchase price, at 3M’s option,
any of 3M’s products which, after normal and proper usage, are determined by 3M to be defective. This warranty does not
extend to any of 3M’s products which have been subjected to misuse, neglect, accident or improper applications, nor shall it
extend to products which have been repaired or substantially altered outside 3M’s manufacturing or repair facility, nor to any
associated instruments, equipment or apparatus. Before utilizing
any of 3M’s products, BUYER should determine the suitability of the product for BUYER'S intended use. 3M MAKES NO

OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. In no case, shall 3M be liable for any special, incidental, or consequential

damages based upon breach of warranty, breach of contract, negligence, strict liability or any other legal theory. This
limitation does not apply to claims for personal injury.

Special Condition: Shipments into authorized distributor locations will have an additional ninety (90) day warranty period.

Conditional Lifetime Warranty

In addition to the Limited Product warranty stated above, 3M provides the following Conditional Lifetime Warranty for its
Electronic Marker Products: When installed in accordance with 3M’s installation instructions, 3M warrants Electronic Markers
for the lifetime of the product, to be free from defects in material and manufacture, provided the Electronic Markers are
located with 3M Dynatel™ Test and Measurement Instruments or other brand locators as may be designated by 3M in
writing. This warranty does not extend to Electronic Markers that have been subjected to misuse or improper applications or
that have been repaired or altered by others. 3M MAKES NO OTHER WARRANTIES INCLUDING, BUT NOT LIMITED TO,
ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. If the Marker is
found to be defective within the product’s normal lifetime, your exclusive remedy shall be, at 3M’s option, to repair or replace
the Marker or refund the purchase price.

Revised June 21, 2005 Page 12of 12