Marechal Electric MELTRIC DXN Series Operating Instructions

ENGLISH OPERATING INSTRUCTIONS
CONSIGNES D'UTILISATION
DX
DXN SERIES
©2023 MELTRIC Corporation. All rights reserved.
MELTRIC Corporation / 4765 W. Oakwood Park Drive Franklin, WI 53132
Tel. : 800 433 7642 / Fax : 414 433 2701 / e-mail : mail@meltric.com
meltric.com
MODE D'EMPLOI
INSTRUCCIONES
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GENERAL

MELTRIC's DXN Series plugs & receptacles are designed and rated for use in
hazardous environments where explosive gases or dusts may be present.
The DXN receptacle has a dead front, which isolates the supply contacts and
prevents user exposure to live parts. The receptacle's safety shutter blocks access
to the contacts and can only be opened by DXN plugs with compatible ratings and
contact configurations.
WARNING
DANGER
death. These instructions must be followed to ensure the safe and proper installation,
operation and maintenance of the MELTRIC devices. Before installation, disconnect
all sources of power to the circuit to eliminate the risk of electrical shock.
CAUTION
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RATINGS & CERTIFICATIONS
NOTICE
To ensure the safe use of this product, the installer must verify that the product is
ADVERTENCIA
properly rated for the application.
DANGER
The amperage and voltage ratings are indicated on the device labels. Some DXN
WARNING
devices are provided with optional auxiliary contacts that make after and break before
CAUTION
the phase contacts. The ratings for auxiliary contacts are shown in Table 1.
DANGER
Hazardous Duty Ratings AVISO
CAUTION
NOTICE
Device
DXN30, 60
DXN plugs & receptacles have both ATEX and CSA ratings for use in hazardous
environments.
ATEX – Class 1 Zone 1 AEx ed IIC T6
This rating certifies the product for use in surface (non-underground) applications
where a high level of protection is required and where the presence of an explosive
atmosphere of any type of gas or dust is likely to occur. The associated maximum surface
temperature of the product is 85°C (185°F), at an ambient temperature of 40°C
(104°F).
CSA – Class 1 Division 2 Group A, B, C, D Class 2 Division 2 Group E, F, G
This rating certifies the product for use in applications where flammable gases, such
as acetylene, hydrogen, ethylene or propane, or dusts, such as magnesium, coal or
grain, may be present under abnormal conditions.
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INSTALLATION

DXN's must be used in conjunction with other appropriately rated hazardous
duty products and must be installed by qualified electricians in accordance with
all applicable local and national electrical codes.
WARNING
Before starting, ensure that the power is off and verify that the conductors meet the
requirements of the National Electric Code and are within the capacities of the DXN
terminals noted in Table 2.
DANGER
Table 2 - Wiring Terminal Capacity
CAUTION
NOTICE
DXN20
DXN30
DXN60
Capacity is based on certification testing. Wire size should be determined
1
in accordance with the electrical code.
Auxiliary contacts are optional
2
General Notes & Precautions
1. Self-tapping screws are provided for use with some polymeric accessories. High
torque may be required to drive them in and fully seat the gasket/s. Once they
are seated, care should be taken in order to avoid over-tightening them against the
poly material. Poly Box with 70° Poly Angle accessory: captive screws must be
tightened to a torque of 1.2Nm (10.62 in-lbs)
Metal Box with 70° Poly Angle accessory: captive screws must be tightened to a
torque of 2.0Nm (17.7 in-lbs)
2. Wire strip lengths are indicated in Table 3. Strip lengths for cable sheathing
will depend on the specific application. When used with handles, the cable
sheathing should extend into the handle to ensure secure cord gripping.
Table 3 - Wire Strip Length - A (receptacle/inlet)
DXN20 - Main
DXN30 - Main
DXN30 - Aux.
DXN60 - Main
DXN60 - Aux
3. Wiring terminals are spring assisted to prevent loosening due to wire strand
settlement, vibration & thermal cycling. They should not be over-tightened. Appropriate
tools and tightening torques are indicated in Table 4. NOTICE: Do not back terminal
screws completely out.
Table 4 - Recommended Tightening Torques
Terminal
DXN20
DXN30
(Main Contacts)
DXN30
(Aux. Contacts)
DXN60
(Main Contacts)
DXN60
(Aux. Contacts)
Assembly for In-line Plugs/Connectors
Do not overtighten terminal or self-tapping screws. Tighten screws to the proper
torque to ensure a secure connection.
Flexible cord connected devices must be equipped with a flexible cord listed for extra
WARNING
hard usage and terminated with listed fittings in accordance with all applicable local
and national electrical codes. See table 6.
DANGER
CAUTION
Type
NOTICE
Extra Hard
Usage
DXN devices are rated to make and withstand short circuit currents with appropriate
fusing as indicated in Table 5.
Table 5 - Short Circuit Make & Withstand Ratings
Device
DXN20 - 20A
DXN30 - 30A
DXN60 - 60A
* DXN20, 30 Ratings are based on testing with Mersen Non-Time delay
current limiting fuses
DXN60 Ratings are based on testing with Little Fuse Non-Time delay
current limiting fuses
* Note: Consult NEC for short circuit limits
When DXN's are used as in-line connectors, finger drawplates should be installed on
both the receptacle and plug in order to more easily provide the leverage required to
properly connect the devices.
Bushing
Strain
Relief
Compression
Nut
Loosely re-assemble the compression nut, bushing and strain relief to the threaded
adapter on the end of the handle and insert the cable through it, the thin black
drawplate gasket and finger drawplate (if applicable), and the color-coded gasket.
Being mindful that the strain relief must clamp on the cable sheath, strip the cable
sheath as required to provide a workable wire length. Then strip the individual wires to
the lengths indicated in Table 3, and twist the strands of each conductor together.
NOTICE: Back out the terminal screws on the receptacle (or inlet) only far enough to
allow the conductors to pass, insert the conductors fully into their respective terminals
and tighten the terminal screws with a hand screwdriver to the torque indicated in
Table 4.
Verify that the cable jacket will extend beyond the strain relief and into the handle.
Assemble the receptacle (or inlet), the color-coded gasket, the finger drawplate, and
the thin black finger drawplate gasket to the handle with the four self-tapping screws
provided. NOTICE: Over-tightening the screws may cause cracking in polymeric
components. Adjust the cable location so that it will not be under tension inside the
handle and tighten the compression nut to secure the cable.
Short Circuit MELTRIC's DXN Series Plugs & Receptacles have short circuits make
(close) and withstand ratings up to 25kA when used with the fusing shown in Table 5.
Assembly for Mounted Receptacles (or Inlets)
In applications where DXN receptacles (or inlets) are mounted to wall boxes, panels
or other equipment, optimal operation is achieved when the device is installed with
the pawl /latch at the top.
NOTICE: If the device is mounted to a wall box, make sure that appropriate hole plugs
are securely tightened in any unused connection holes.
Insert the cable or wires through the wall box and cut to allow adequate length,
strip the cable sheath, as desired, strip the individual wires to the lengths
indicated in Table 3, and twist the strands of each conductor together. Back out
the terminal screws on the receptacle (or inlet) far enough (but not completely)
to allow the conductors to pass, insert the conductors fully into their respective
terminals and tighten the terminal screws to the torque indicated in Table 4, with a
hand screwdriver.
Assemble the receptacle (or inlet) and the color-coded gasket to the box with
appropriate hardware. NOTICE: Over-tightening the screws may cause cracking in
polymeric components. Assemble the mating plug (or receptacle) to the cord end as
indicated in the assembly instructions above for in-line connections, except there will
be no finger drawplate or associated black gasket.
In cases where custom mounting is being performed to an appropriate hazardous
duty box or panel, the clearance and mounting holes should be drilled as indicated
in the following diagram.
Hole Pattern for Custom Mounting
DXN20: 2.00"
(51mm)
DXN30: 2.25"
(56mm)
DXN60: 2.72"
(69mm)
NOTICE: In order to maintain IP66/IP67 protection in custom installations, watertight
seals must be used under the heads of the four mounting bolts and they must be
retained by a lock washer and nut on the inside of the box or panel. Alternatively,
four blind holes can be drilled and threaded to accommodate #8-32 x 5/8" mounting
screws. The hole depth must be sufficient to achieve adequate gasket compression.
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OPERATION

To ensure safe and reliable operation, MELTRIC plugs and receptacles must be
used in accordance with their assigned ratings.
They can only be used in conjunction with mating receptacles or plugs manufactured
by MELTRIC or another licensed producer of products bearing the
WARNING
trademark.
DANGER
MELTRIC plugs & receptacles are designed with different keying arrangements, so
that only plugs and receptacles with compatible contact configurations and electrical
CAUTION
ratings will mate with each other.
Connection
NOTICE
To connect a plug and receptacle, first depress the pawl to open the lid on the
receptacle, then orient the plug 1. so that the red arrow on the outside of the casing
lines up with the red arrow just to the left of the latch on the receptacle casing.
Push the plug partially into the receptacle until it hits a stop, then rotate the plug in
the clockwise direction until it hits another stop after about 30° of rotation. At this
point, the circuit is still open. Push the plug straight into the receptacle 2. until it
becomes securely latched in place. The connection is now made. For in-line connectors,
squeeze the drawplates on both sides of the device together until the plug latches in place.
1
NOTICE: When making a connection, ensure that the plug latch is secured behind
the catch on the blue pawl. A properly connected plug cannot be pulled out of the
receptacle.
Disconnection
To break the connection, simply depress the pawl as shown in figure 3. This will
break the circuit and eject the plug straight out to the rest, or off, position. The plug
contacts are de-energized at this point. To remove the plug, rotate it counterclockwise
(CCW) (about 30°) until it releases from the receptacle as shown in figure 4. Close
and latch the lid on the receptacle.

Achieving Watertightness Ratings

3
DXN's have an IP66/IP67 rating for protection against ingress of water, dust and
other matter. IP66 provides total protection against dust and water jets. IP67 adds
protection for temporary immersion in shallow water.
These ratings apply when the plug and receptacle are mated. They also apply to the
receptacle alone, provided that its lid is latched in the closed position. Optional plug
caps are available for providing IP66/IP67 protection on unmated plugs.
NOTICE: MELTRIC threaded handles come with tapered style threads.The use of
fitting seal tape is recommended to maintain watertightness of all NPT fittings and
joints.
Lockout Provisions
All DXN plugs are provided with lockout provisions. To lockout the plug, insert the locking
device through the hole provided in the casing. This will prevent the plug from being
able to be inserted into a receptacle.
Receptacles can be purchased with optional lockout provisions. MELTRIC's Locking
Pin must be used to lockout the receptacle. Close and latch the lid. Slide MELTRIC's
Locking Pin through the hole provided in the latch and place a padlock or other
locking device through one of the holes on the locking pin. This will prevent the lid
from being opened.
NOTICE: Attaching the receptacle locking device with the lid open will not prevent
the insertion of a plug. Lockout is only accomplished when the lid is locked closed.
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MAINTENANCE

WARNING
DANGER
of electrical shock. Any replacement of DXN components must be performed under the
control of the manufacturer: MELTRIC Corporation.
CAUTION
MELTRIC products require little on-going maintenance.However, it is a good practice to
periodically perform the following general inspections:
NOTICE
• Check the mounting screws for tightness.
ADVERTENCIA
• Verify that the weight of the cable is supported by the strain relief mechanism and
not by the terminal connections.
DANGER
• Check the IP gaskets for wear and resiliency.Replace as required.
• Verify the electrical continuity of the ground circuit.
CAUTION
• Check the contact surfaces for cleanliness and pitting.
AVISO
Deposits of dust or similar foreign materials can be rubbed off the male contacts
with a clean cloth. Sprays and grease should not be used, as they tend to collect
dirt. If any significant pitting of the contacts or other serious damage is observed, the
device should be replaced. Risk of electrostatic discharge: use a cloth slightly soaked
in soapy water for cleaning
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MANUFACTURER'S RESPONSIBILITY
MELTRIC's responsibility is strictly limited to the repair or replacement of any product
that does not conform to the warranty specified in the purchase contract. MELTRIC
shall not be liable for any penalties or consequential damages associated with
the loss of production, work, profit, or any other kind of financial loss incurred by the
customer.
MELTRIC Corporation shall not be held liable when its products are used in conjunction with
products not bearing the
in conjunction with mating devices that are not marked with the
trademark shall void all warranties on the product.
MELTRIC Corporation is an ISO 9001 certified company. Its products are designed,
manufactured and rated in accordance with applicable UL, CSA and IEC standards.
MELTRIC designs and manufactures its products in accordance with Marechal
keying standards established to ensure intermatablility with similarly rated products
manufactured by Marechal Electric Group.
A manufacturer of products using Marechal technology
There are inherent dangers associated with electrical products.
Failure to follow safety precautions can result in serious injury or
Table 1 - Auxiliary Contact Ratings
120 VAC 240 VAC
5A*
Main Contacts
Max
10
6
4
0.50/ 0.50
0.79/ 0.83
0.67/ 0.67
0.79/ 0.83
0.67/ 0.83
7.1 in-lbs
10.6 in-lbs
7.1 in-lbs
17.7 in-lbs
7.1 in-lbs
Table 6 - Flexible Cord
Max Nos of
Conductors
Rating Fuse
25 kA@600VAC
25 kA@600VAC
25 kA@600VAC
Threaded
Adapter
Handle
DXN20: 1.656" (42 mm)
DXN30: 1.890" (48 mm)
DXN60: 2.171" (55.2 mm)
Receptacle
Before inspecting, repairing, or maintaining MELTRIC products,
disconnect electrical power to the receptacle to eliminate the risk
technology trademark. The use of MELTRIC products
480 VAC
5A*
Aux. Contacts
Min
16
14
10
Inches
Torque
5
DXN20 Remove Adhesive Liner
Color-Coded
Gasket
2
4
600 VAC
5A* 5A* (550 V max)
- AWG
1
Max
N/A
10
10
mm
12/12
20/ 21
17 /17
20 /21
17/21
Flat Screwdriver
1/8" precision tip
3/16" precision tip
1/8" precision tip
3/16" precision tip
1/8" precision tip
Flexible Cable Range
Max Øin Min Øin
0.812 0.312
Type*
RK1
RK1
RK1
Finger Drawplate Gasket
Finger Drawplate
Receptacle
(or Inlet)
4 x Ø.196
(#9 or 5mm)
DXN20: 1.656"
(42mm)
DXN30: 1.890"
(48mm)
DXN60: 2.171"
(55.2mm)
Pawl
Latch
Plug/ Inlet
INSDXN Q
2
30A
70A
100A
technology
technology
INSDXN Q
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