4888 and 4988 Outdoor
Protected Entrance Terminals
Underwriters Laboratories (UL) Listed
Instructions
January 1997
34-7031-7272-5 Revision C
Contents:
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
General ........................................................................................................................................................ 1
Accessories .................................................................................................................................................. 2
Protector Specifications ............................................................................................................................... 2
Tool Requirements ....................................................................................................................................... 2
Terminal Locations ....................................................................................................................................... 2
Terminal Grounding ...................................................................................................................................... 2
Entrance Cable Preparation and Termination .............................................................................................. 2
Multiple Terminal Installation ........................................................................................................................ 4
Distribution Cable Termination ..................................................................................................................... 5
Protector Installation and Testing ................................................................................................................. 6
Skirt Kit Installation ...................................................................................................................................... 6
1.0 General
The 3M brand outdoor Protected Entrance Terminals (PETs) provide protection and termination of entrance
and distribution cables, are available in 25, 50 and 100 pair count and are Underwriters Laboratories (UL)
Listed.
4888-100
4988-50
1.01 The terminals contain the following features and
components:
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e. Strain relief components for entrance cable.
f. An external 3-port ground bar.
a. A short stub; with one end preconnectorized to
a flame retardant MS2TM modular connector
body/cover, the other end prewired to the
protector receptacle.
Note:
g. An internal insulated ground strap.
h. Mounting template and mounting screws (4).
i. Distribution terminal points.
The 4888-B and 4988-B PETs contain a
710-type splice connector instead of the
MS2 modular connector.
j. Pair count log label.
k. "Quiet Front" Terminal screws.
b. A flame retardant modular connector base.
l. 4327 Pair Test Probe, 4347 Pair Test Clip.
c. A protector receptacle field.
d. An integral splice chamber.
1
Note:
1.02 Terminal Wiring Schematics:
26 AWG
Fuse Wire
Protector
Module
5.0 Terminal Locations
Modular Hardwire
Block
From C.O.
4888 Wiring Schematic
26 AWG
Fuse Wire
5.01 Locate terminal according to standard operating
procedures. Consider the following points as
much as possible:
883706
a. Locate terminal on a firm mounting surface
where it will be accessible to the technicians
at all times; where it can be reached without a
ladder; and where it will not project in a
hazardous manner.
Protector
Module
Self Strip
Block
From C.O.
CAUTION: Avoid locations near flammable
materials, ignitable gases, dust,
moisture, temperature extremes,
moving machinery, electric light and
power circuits, and electrical
equipment.
4988 Wiring Schematic
1.03 Terminal Dimensions
Model
Protected entrance terminals are to be
installed in accordance with Article 800,
Section C of the National Electric Code
(ANSI/NFPA 70).
Height
Width
Depth
b. Observe caution when exposing terminal to
chemicals in liquid or vapor form as they may
damage the plastic components.
4888-25
4988-25
24"
(610 mm)
14 3/4"
(375 mm)
7"
(178 mm)
4888-50
4988-50
24"
(610 mm)
14 3/4"
(375 mm)
7"
(178 mm)
5.02 Open enclosure door by using a 7/16" terminal
wrench.
4888-100
4988-100
24"
(610 mm)
14 3/4"
(375 mm)
7"
(178 mm)
5.03 Open the splicing chamber by removing the two
screws on the splice chamber door. Reinsert
screws in tapped holes to avoid losing screws.
5.04 Pull the preterminated short stub, insulated
ground wire, and accessories out of the splicing
chamber.
2.0 Accessories
2.01 4889 Coupling Kit - The 4889 Coupling Kit is
used for stacking two or more terminals.
5.05 Tape the mounting template to the designated
position and mark screw locations (4). Remove
mounting template.
2.02 4890 Skirt Adapter - The 4890 Skirt Adapter is
used to attach a BET PED Skirt to a 4888 or 4988
terminal.
5.06 Mount the terminal in designated position with
the four mounting screws provided.
2.03 4327 SS Pair Probe - The 4327 SS Pair Probe
provides electrical access to a pair of 4320 Self
Strip contacts.
6.0 Terminal Grounding
2.04 4347 Pair Test Clip - The 4347 Pair Test Clip
allows for test connections to be made to both Tip
and Ring binding post screw washers
simultaneously on all types of 3M Brand Modular
Hardwire Blocks.
Fasten a #6 AWG wire to the ground bar which is
located on the front of the unit. Connect other
end of ground wire to local ground per company
standards.
Note:
3.0 Protector Specifications
To maintain UL Listing, only five pin protectors
that are UL Recognized or Listed can be used.
Failure to properly bond and ground the
terminal per N.E.C. or local equivalent
codes may render protection arrestors
useless.
7.0 Entrance Cable Preparation and
Termination
4.0 Tool Requirements
The following tools are required to install the 3M
brand PETs:
Note:
Typical Entrance Cable
- Standard Hand Tools
- MS2 Modular Splicing Rig
- MS2 4044 Splice Head Frame Adapter
- "B" versions require 710 Connector Splicing Rig
2
The maximum cable diameter for this
terminal is 1 1/2" (38 mm). Minimum cable
diameter allowed in the area of PST
application is 1" (25 mm). If the cable
diameter is smaller than 1" (25 mm), build up
diameter by applying ScotchTM 88T Vinyl
Tape or equivalent.
7.10 Attach insulated ground wire to bonding
connector per standard procedure.
7.01 Extend entrance cable at least 30" (762 mm)
past cable entry port. Temporarily fasten cable
to wall 18" (457 mm) minimum, above or below
terminal, dependent on cable entrance choice.
7.11 Slide PST over gland assembly and butt up to
terminal. Slowly unwind loose core tail in a
counterclockwise direction while edging PST
toward terminal side as the core is removed.
7.02 Remove knockout at selected cable entry location.
7.03 For bottom entry, slide 3M brand Pull'N'Shrink
Tubing (PST) over cable sheath with pull tab
facing down. Slide gland (without nut) over cable
sheath with fingers facing down. For top entry,
pull tab on PST and fingers on gland must be
facing up when sliding over cable sheath.
Bottom Entry
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Note:
7.04 Temporarily tape PST and gland to wall, cable or
other suitable surface to keep the PST and gland
out of the way.
7.05 Lay cable against terminal and mark sheath
allowing for a minimum of 2" (51 mm) of cable
sheath to extend past the cable entry port.
Core Wrap
The PST must be positioned a maximum of
3/8" (10 mm) away from the terminal entry
port. If this dimension is not achieved,
remove collapsed PST with a sharp knife
and remove cable and gland from terminal.
Repeat steps 7.03, 7.08, 7.09, 7.10, 7.11 and
7.12.
7.12 After positioning PST as close as possible to
terminal, continue core removal to collapse PST
over the gland. Complete core removal.
1/2" (13 mm)
2" (51 mm)
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7.06 Remove cable sheath leaving a minimum of 1/2"
(13 mm) of core wrap to protect cable from
bonding connector. Conductor length should be
a minimum of 27" (686 mm). Install bonding
connector per standard procedure.
883707
7.13 Wire Termination:
a. Attach 4041 Splice Head to 4044 Frame
Adapter. Snap adapter legs into diamondshaped cutouts in bracket.
7.07 Identify and tape ends of binder groups to keep
conductors from unwinding during splicing.
7.08 Install the cable through cable entry port into the
splice chamber of the terminal.
Note:
7.09 Slide the gland up the cable and insert into the
cable entry port. While holding gland in this
position, slide nut over cable beyond bonding
connector and install gland and nut.
Gold adapter must be placed in splice head
before splicing.
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923966
3
b. Place modular connector base onto splicing
head. The cut corner of the base should be on
the left-hand side and rear of the splicing head.
8.0 Multiple Terminal Installation
8.01 Vertical Stacking
c. Select entrance cable binder group and lay
into base by color code. Check conductor
order with check comb. Select matching
binder group from preconnectorized short
stub. Place body/cover on top of base,
matching the cut corners.
The design of the integral splice chamber
enables up to three PETs of same pair count to
be stacked vertically (dependent on cable
diameter). Vertical stacking is used when the
entrance cable pair count is greater than the
capacity of a single PET or when the installation
design requires that only a portion of entrance
cable pairs be initially terminated.
d. Crimp connector using the 4030, 4031 or 4036
crimping unit.
e. Install sealant boxes on modules.
Note:
a. Fasten entrance cable to the wall above or
below terminals, dependent upon cable
entrance choice. Attach the PETs to the
mounting surface in a vertical arrangement.
Use the mounting template to ensure proper
spacing between terminals.
For health, safety, and disposal
information, see sealant box label or
Material Safety Data Sheet.
f. For wire termination onto the preconnectorized
710-type connector short stub, refer to the Bell
System practice, section 632-205-220.
b. When stacking vertically, a coupling kit must
be used to connect the cabinets at the splice
chambers.
g. Remove door from terminal.
Note:
c. Install stacked units starting from bottom.
Reinstall door when wire termination is
completed.
Note:
h. Remove clamp from traverse bar assembly
and mount traverse bar 3" (76 mm) from PET
with two #12 wood screws (not supplied).
When using the coupling kit the fingers on
the gland must be trimmed.
883707
873589
832585
d. Remove cable sheath, leaving a minimum of
1/2" (13 mm) of core wrap to protect cable
from bonding connector. Free conductor
length should be equal to or longer than the
vertical length of the mounted PETs.
913964
7.14 After termination is complete, neatly bundle wire
and modular connectors and lay in splice
chamber. Close chamber door and secure
with screws supplied or any #8-32 screw 1/4" 1/2"
(6 mm - 13 mm) long to meet UL requirements.
e. Identify and tape ends of binder groups to
keep conductors from unwinding during
splicing operations.
f. Install binder groups into the corresponding
PETs through the entry gland.
7.15 ScotchlokTM UR and UY Connectors may be
substituted for the modular connectors on the
preconnectorized short stub. Use Scotchlok
E-9 Series Tools for proper crimping of
connectors.
Note:
For wire termination onto
preconnectorized short stub, refer to the
MS2 Splicing Instruction Bulletin.
g. When the installation design requires that only
a portion of entrance cable pairs be initially
terminated, the free conductors should be a
minimum of 27" (686 mm) from the farthest
PET cable entry port. Tape ends together and
neatly lay them into the integral splice
chamber on top of the terminated cable pairs.
4
f. Always route jumper wire below the connected
cap.
9.0 Distribution Cable Termination
9.01 4888 Protected Entrance Terminals
Terminate station wire or 22-26 AWG jumper wire
onto Modular Hardwire Block with screwdriver.
842982
a. Split pair (Tip-left, Ring-right) at the assigned
binding post. Strip wire ends.
2" (51 mm)
Slack Loop
b. Wrap wires between washers in a clockwise
direction. Single wrap each wire and trim
excess wire.
Note:
9.03 Testing 4888 Terminal
Note:
Excessive tightening of screw may break
wire.
Binding post screw heads have been
coated with a nonconductive material
resulting in a "Quiet Front" condition. Use
only approved test equipment on block.
Quiet Front
Coating
832714
863408
a. Connect test set to talk block.
c. Route wires from bottom row of binding posts
UP to jumper runway.
b. Attach 4347 Test Clip onto washers of tip and
ring of one pair.
d. Lay wires into runway between binding posts
and route wires through wire guides.
9.02 4988 Protected Entrance Terminals
Terminate station wire or 22-24 AWG jumper wire
to feeder block.
791495
a. Split pair (Tip-left, Ring-right) at assigned cap
position. Wire ends should not be stripped.
c. Test per standard procedure.
b. Form 90° hook on end of jumper wire. Make
sure wires have clean cut ends.
1/2" - 3/4"
(13 - 19 mm)
9.04 Testing 4988 Terminal
a. Align pair probe.
Tip Cap
873557
c. Make sure assigned caps are in the
unconnected position with the screwdriver slot
orientated vertically.
Ring Cap
Cap Test Ports
d. Insert wire into entry port through the cap until
the wire is visible from the exit port.
e. Insert screwdriver in cap slot and rotate 90°
clockwise until you feel the cap come to rest
against the stop. As the cap rotates, the wire
is simultaneously connected and trimmed off.
Note:
Tip
842987
Make sure screwdriver blade is fully
inserted into cap slot before rotating.
Note:
Connected Cap Position
Unconnected Position
873557
Ring
5
Pair probe attaches to connected or
unconnected caps.
11.0 Skirt Kit Installation
b. Insert pins in test ports. Depress spring loaded
clamps sufficiently to allow clearance over cap
heads.
PET Terminal Wall
Lock Washer
Carriage Bolt
842988
Nut
Release and position fingers behind clamps.
Push pair probe forward until the clamps snap
behind the cap heads.
Skirt Adapter
Skirt Wall
883708
842989
Note:
4324 Priority Caps prevent unauthorized
(test probe) access.
c. Remove probe by depressing clamps clear of
the cap head and pulling pair probe clear of
the caps.
10.0 Protector Installation and Testing
Fully insert appropriate UL Recognized or Listed
protector into protector receptacle. Refer to
Section 3.0.
Important: All protectors must be fully inserted
during testing.
Standard protector jack field pin
configurations are used with the
central grounding pin serving to
polarize the module. A pair of long
pins on each module connect TIP and
RING to the entrance cable side while
shorter pins connect to the line side.
Detents on the longer pins hold the
protector in place when it is pulled out
to an intermediate position to
disconnect the line. When in this
position, the entrance cable side
continues to be protected.
74201
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MS2, Scotch and Scotchlok are registered trademarks of 3M.
Important Notice
All statements, technical information and recommendations related to the Seller's products are based on information believed to
be reliable, but the accuracy or completeness thereof is not guaranteed. Before utilizing the product, the user should determine
the suitability of the product for its intended use. The user assumes all risks and liability whatsoever in connection with such use.
Any statements or recommendations of the Seller which are not contained in the Seller's current publications shall have no force
or effect unless contained in an agreement signed by an authorized officer of the Seller. The statements contained herein are
made in lieu of all warranties, express or implied, including but not limited to the implied warranties of merchantability and fitness
for a particular purpose which warranties are hereby expressly disclaimed.
SELLER SHALL NOT BE LIABLE TO THE USER OR ANY OTHER PERSON UNDER ANY LEGAL THEORY, INCLUDING BUT
NOT LIMITED TO NEGLIGENCE OR STRICT LIABILITY, FOR ANY INJURY OR FOR ANY DIRECT OR CONSEQUENTIAL
DAMAGES SUSTAINED OR INCURRED BY REASON OF THE USE OF ANY OF THE SELLER'S PRODUCTS THAT WERE
DEFECTIVE.
34-7031-7272-5-C
3M Telecom Systems Group
6801 River Place Blvd.
Austin, TX 78726-9000
3M 1997
Litho in U.S.A.