POWER CORD INSTALLATION GUIDE
Raritan PXThis installation guide explains how to install power cords
on Raritan PX products that do not come with a factory
installed power cord. This type of product, such as
PX2-4550XU and in-line monitors, provides the flexibilityof using a power cord with the style you need.

Safety Guidelines
WARNING! These instructions are not for products withfactory-installed flexible cords. Do not open a Raritan product witha factory-installed cord.
WARNING! Do not replace the cable gland. The chassis is punched
for the correctly-sized gland and is not for different wiring methods
such as conduit.
WARNING! These instructions must be performed by a licensed
electrician.
WARNING! Raritan products must not be serviced while energized.
Before servicing, (a) disconnect from power, (b) disconnect any
devices plugged into the product's receptacles, and (c) disconnect
all interconnect cables.
WARNING! Read and understand all sections in this guide before
installing or operating this product.

Attempting to power non-rated devices may result in electric
shock, fire, personal injury and death.
WARNING! Do not use a Raritan product containing outlet relays topower large inductive loads such as motors or compressors.
Attempting to power a large inductive load may result in damage tothe relay.
WARNING! Do not use this product to power critical patient careequipment, fire or smoke alarm systems. Use of this product topower such equipment may result in personal injury and death.
WARNING! Assembly of this product’s line cord and/or plug mustbe performed by a licensed electrician and the line cord or plugs
used must be suitably rated based on the product’s nameplate
ratings and national and local electrical codes. Assembly byunlicensed electricians or failure to use suitably rated line cords orplugs may result in electric shock, fire, personal injury or death.

WARNING! Connect this product to an AC power source whose
voltage is within the range specified on the product’s nameplate.
Operating this product outside the nameplate voltage range may
result in electric shock, fire, personal injury and death.

WARNING! This product contains a chemical known to the State ofCalifornia to cause cancer, birth defects, or other reproductiveharm.

WARNING! Connect this product to an AC power source that iscurrent limited by a suitably rated fuse or circuit breaker inaccordance with national and local electrical codes. Operating thisproduct without proper current limiting may result in electric
shock, fire, personal injury and death.

Safety Instructions

WARNING! Connect this product to a protective earth ground.
Never use a “ground lift adaptor” between the product’s plug andthe wall receptacle. Failure to connect to a protective earth groundmay result in electric shock, fire, personal injury and death.
WARNING! This product contains no user serviceable parts. Do notopen, alter or disassemble this product except as described in thismanual. Failure to comply with this warning may result in electricshock, personal injury and death.
WARNING! Use this product in a dry location. Failure to use thisproduct in a dry location may result in electric shock, personal
injury and death.
WARNING! Do not rely on this product’s receptacle lamps,receptacle relay switches or any other receptacle power on/off
indicator to determine whether power is being supplied to a
receptacle. Unplug a device connected to this product before
performing repair, maintenance or service on the device. Failure tounplug a device before servicing it may result in electric shock, fire,personal injury and death.
WARNING! Only use this product to power information technology
equipment that has a UL/IEC 60950-1 or equivalent rating.
Raritan PX Power Cord Installation Guide
PowerCord_InstallGuide_1B_3.6.10  255-80-6083-00 RoHSQS Rule1. Installation of this product should only be performed by alicensed electrician.
2. Make sure the line cord is disconnected from power before
physically mounting or moving the location of this product.
3. This product is intended to be located in an equipment rack in
an information technology room. In the United States,installation must comply and be done in accordance with NEC(2011) Article 645 Information Technology Equipment.
4. This product is designed to be used within an electronicequipment rack. The metal case of this product is electricallybonded to the line cord ground wire. A threaded grounding
point on the case may be used as an additional means ofprotectively grounding this product and the rack.
5. Examine the branch circuit receptacle that will supply electric
power to this product. Make sure the receptacle’s power lines,
neutral and protective earth ground pins are wired correctly
and are the correct voltage and phase. Make sure the branch
circuit receptacle is protected by a suitably rated fuse or circuit
breaker.
6. If the product is a model that contains receptacles that can beswitched on/off, electric power may still be present at a
receptacle even when it is switched off.
QS Rule1

Before Installation
Read the following precautions before installing any power cord orplug on a PDU.

••If a plug is to be attached to the flexible cord, the length of theflexible cord must not exceed 4.5 meters - as specified in UL60950-1 (2007) and NEC 645.5 (2011).
The flexible cord may be permanently connected to power
subject to local regulatory agency approval. In the UnitedStates, relevant electrical regulations can be found in NEC(2011) sections 400.7(A)(8), 400.7(B), 368.56 and table 400.4.

WARNING! DO NOT perform wiring assembly for this productunless you are an experienced, licensed electrician. Assemblyor attempted assembly by inexperienced or unlicensed
electricians may result in electrical shock, fire, personal injury,and death. If you are not a qualified electrician withappropriate licensing and insurance - STOP NOW. This is work
you cannot and should not attempt. Raritan is not responsible
for any consequential damages to equipment or loss of data
due to improper installation.

Plug Selection

FOR QUALIFIED ELECTRICIANS: Read the instructions in their
entirety before starting the installation. You must follow all
wiring instructions, ensure compliance with national and local
safety and electrical codes, and follow all other electricalsafety requirements with regard to over-current protection.
STOP and contact Raritan Technical Support if you are unsureof any answers, or have additional questions.

•If a plug is to be attached to the flexible cord, the plug’s rated
ampacity is chosen as follows:•

In the United States, as specified in UL 60950-1, the plug’s rated
ampacity must be 125% greater than the Raritan product’srated ampacity. In some Raritan products, such as 35A 3-phasedelta wired PDUs, an exactly 125% rated plug is not available. In
these cases, choose the closest plug that is more than 125%.
For example, a 50A plug is the closest fit for a 35A 3-phase PDU.
For all other locations, subject to local regulatory agency policy,
the plug’s rated ampacity is the same as the Raritan products
rated ampacity.

Receptacle Selection
QS RuleFlexible Cord Installation Instructions
The following instructions are for Raritan products manufactured toaccept user-installed flexible cords. These products are visuallyidentified by the cable gland used to hold the flexible cord.

For Raritan in-line monitors, any receptacle fitted to the outlet
flexible cord must have identical ratings as the plug attached to theinlet flexible cord.

Derating a Raritan ProductLower rated plugs, receptacles and flexible cords may be connected
to a Raritan product. This results in a derated (reduced) ampacity
rating for the product.
Derating guidelines:

1. Choose the plug and use its rated ampacity to determine thederated ampacity.
▪ In the United States, as specified in UL 60950-1, the derated
ampacity is 80% of the plug’s rated ampacity. For example,a 30A plug would result in a derated ampacity of 24A.
▪ In other geographic locations, subject to local regulatory
agency approval, the derated ampacity is the plug’s ratedampacity. For example, using a 16A plug would result in aderated ampacity of 16A.

Flexible Cord Selection•••

The preferred flexible cable is type SOOW, 600V, 90°C or 105°C.
Consult Raritan before using a different flexible cable type.
The rated ampacity of the flexible cord must be greater than orequal to the Raritan product’s rated ampacity marked on its
nameplate. In the United States, relevant ampacity ratings forflexible cords can be found in NEC(2011) section 400.5.
The number of wires in the flexible cord must match thenumber of terminals (including the ground terminal) inside theRaritan product. See Wiring of 3-Phase In-Line Monitors (onpage 3) for exceptions.

Raritan PX Power Cord Installation Guide
PowerCord_InstallGuide_1B_3.6.10  255-80-6083-00 RoHS

2. The derated ampacity must be marked on the Raritan productso the new reduced rating can be easily identified.
3. For in-line monitors, the receptacles used must have the same
voltage and ampacity rating as the plug chosen in step 1.

2

4. The flexible cord must have a rated ampacity greater than orequal to the derated ampacity. Since the new flexible cord may
be smaller diameter, a check must be performed to insure thecable gland nut, when tightened, will securely hold the flexible
cord so that it cannot be twisted, pulled or pushed in the cablegland. A sealing ring, for small diameter flexible cords, may
have been included with the Raritan product, or can be sourced
from a electrical equipment supplier, to reduce the inside
diameter of the cable gland.

One-channel in-line monitor

Zero U PDU
Wiring of 3-Phase In-Line Monitors
3-phase in-line monitors contain 4-pole wiring terminal blocks (L1,L2, L3, N) to monitor 5-wire (4P+PE) 3-phase wye connections.
Delta wired 4-wire (3P+PE) 3-phase connections are also permitted(no wire connected to the terminal block neutral “N”). No
additional hardware or firmware configuration is required tospecify whether the connection is 5-wire wye or 4-wire delta.

In-Line Monitor Unused Channels
It is not necessary to wire up all channels of multi-channel in-line
monitors. The inlet and outlet openings of unused channels must
be completely closed off. “Goof plugs” for this purpose may be agood choice if they are available in your country or region.

Make sure to locate the ground wire mounting stud(s). Thereis a separate ground wire mounting stud for each terminal
block. Each flexible cord MUST have its green (orgreen/yellow) ground wire bonded to a ground wire mountingstud.

Step by Step Flexible Cord Installation
The following items are required to complete the installation:
••
•
•



Flexible cord(s).
Insulated ring terminals (one for each wire) and appropriate
crimp tool.
Plug(s) and receptacle(s) (for in-line monitors)
Torque screwdriver, torque nut driver and torque wrench totighten the wiring terminal block screws, ground nut and cablegland nut.

For in-line monitors, make sure to identify the inlet terminal
blocks (rear of monitor) and outlet terminal blocks (front ofmonitor). Each inlet terminal block has a corresponding outlet
terminal block.

To install a flexible cord:

1. Open the PDU's access panel (or in-line monitor top panel) toexpose the power wiring terminal block(s).

Raritan PX Power Cord Installation Guide
PowerCord_InstallGuide_1B_3.6.10  255-80-6083-00 RoHS

3

Number

Description

Nut size

Torque setting (N·m)

Tolerance

Inlets (labeled LINE)

M3

0.49

10%

Outlets (labeled LOAD)

M4

1.278%

M5

1.96

5%

M6

2.94

3.5%

M8

4.9

2%

2. Strip off the outer jacket of the flexible cord and remove any
jute, paper or other fillers. Use the following to help determine
how much jacket to remove:▪ In the finished assembly, the outer jacket should protrude
inside the Raritan product.
▪ The wires will have ring terminals crimped onto them.
▪ In the finished assembly, the wires should have some slackand not be taught.
▪ In the finished assembly, if the flexible cord slips in thecable gland placing a strain on the cord’s wires, the groundwire must be the last wire to take the strain.

d. Check the ground wire connection. It should be secure andnot move or rotate.

3. Crimp an insulated ring terminal onto each wire. A
non-insulated ring terminal may be used for the ground wire.
Inspect each crimp to insure it is secure and verify no exposed
wire protrudes from the rear of an insulated ring terminal.
4. Loosen the cable gland nut and push the flexible cord assembly
through the gland.

Temporarily hand tighten the gland nut and verify the cordcannot be twisted or pushed or pulled in the gland. Do notproceed if hand tightening results in a loose cord. In somemodels, especially in-line monitors, the flexible cord’s
diameter may be too small for the cable gland. A sealing ringfor smaller diameter line cords may have been included withthe Raritan product, or can be requested from Raritan, toreduce the inside diameter of the cable gland.

6. Fasten the ring terminals of all remaining wires to the terminal
block and tighten each using a torque screwdriver. The
appropriate torque settings vary according to the screw size.

Screw size

Torque setting (N·m)

Tolerance

M3

0.4910%M4

1.278%

M5

1.965%

M6

2.94

3.5%

M84.92%Make sure each ring terminal is firmly fastened and cannot be
twisted by hand. Use the following guidelines to help terminal
block wiring.
▪

In single-phase Raritan products with world-wide ratings,
the terminals are labeled L1 and L2. L1 is the phase wire. L2
is either the neutral (120/230V installations) or anotherphase wire (208V installations).

5. Fasten the ring terminal of the green (or green/yellow) groundwire to the chassis’s threaded ground stud in this order:
a. Place the lock washer on the stud.
b. Place the ground wire ring terminal on the stud.
c. Place the nut on the stud and tighten with a torque wrench.
The appropriate torque settings vary according to the nutsize.
Raritan PX Power Cord Installation Guide
PowerCord_InstallGuide_1B_3.6.10  255-80-6083-00 RoHS4▪
▪

▪

In all 3-phase products, L1 is phase A, L2 is phase B, L3 isphase C and N is neutral.
If your PDU is inlet metered, such as PDU models PX2-1nnn
and PX2-2nnn (where n is a number), you must pass eachline cord wire through the correct CT in the correct
direction. Each CT is labeled and contains a direction arrow.
Push the ring terminal end of the line cord through the CT
in the direction indicated by the arrow. For example, pushthe L1 line cord wire through the CT labeled L1 and thenconnect it to the L1 terminal block.

10. Complete the wiring of the inlet flexible cord by performing oneof these steps:▪ Assemble the plug following the manufacturer’sinstructions.
▪ Permanently attach and strain relief the flexible cord to ajunction box following applicable electrical codes.

For Raritan in-line monitors, where there is a one to one
correspondence between plug and receptacle, maintain thesame wire colors for inlet and outlet flexible cords.

7. Make final adjustments to the cable gland and verify the jacketof the flexible cord extends into the Raritan product. Hand
tighten the gland nut and finish tightening with a torquewrench. Appropriate torque settings vary according to thecable gland size.

Cable gland size

Torque setting (N·m)

M12x1.5

0.7 to 0.9

M16x1.5

2.0 to 3.0

M20x1.5

2.7 to 4.0

M25x1.5

5.0 to 7.5

M32x1.57.5 to 10.0

M40x1.5

7.5 to 10.0

M50x1.5

7.5 to 10.0

M63x1.5

7.5 to 10.0

Note: The cable gland size is marked on the cable gland body.
After tightening, examine the flexible cord and cable gland forthe following:▪

▪

Make sure you can see a few remaining threads between
the cable gland body and cable gland nut. The gland nut
must not bottom out on the gland body.
Make sure the flexible cord does not move in the cablegland when it is twisted, pushed or pulled.

8. Re-install the PDU wiring access panel or in-line monitor coverplate. This completes internal wiring of the Raritan product.
9. For in-line monitors, fasten the receptacles to the outlet
flexible cords following the manufacturer’s instructions.

Raritan PX Power Cord Installation Guide
PowerCord_InstallGuide_1B_3.6.10  255-80-6083-00 RoHS5