Marechal Electric Meltric DXN Series Operating Instructions Manual

ENGLISH
OPERATING INSTRUCTIONS
DXN SERIES
MELTRIC Corporation / 4765 W. Oakwood Park Drive Franklin, WI 53132
Tel. : 800 433 7642 / Fax : 414 433 2701 / e-mail : mail@MELTRIC.com
A manufacturer of products using Marechal technology
MELTRIC.com A COMPANY OF MARECHAL ELECTRIC

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
There are inherent
dangers associated with
electrical products. Failure to follow safety precau- DANGER
tions can result in serious injury or death. These
instructions must be followed to ensure the safe and
CAUTION
proper installation, operation and maintenance of the
MELTRIC devices. Before installation, disconnect all
sources of power to the circuit to eliminate the risk of
NOTICE
electrical shock.
ADVERTENCIA
RATINGS & CERTIFICATIONS
To ensure the safe use of this product, the
DANGER
installer must verify that the product is properly
rated for the application.
CAUTION
The amperage and voltage ratings are indicated on
the device labels. Some DXN devices are
WARNING
provided with optional auxiliary contacts that make
AVISO
after and break before the phase contacts. The
ratings for auxiliary contacts are shown in Table 1.
DANGER
Hazardous Duty Ratings
CAUTION
Table 1 - Auxiliary Contact Ratings
Device 120VAC 240VAC 480VAC
DXN30,60 5A* 5A*
NOTICE
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 tem-
perature 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 con-
ditions.
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 ver-
ify that the conductors meet the requirements of the
INSDXN L National Electric Code and are within the capacities of
the DXN terminals noted in Table 2.
Table 2 - Wiring Terminal Capacity
NOTICE
DXN20
DXN30
DXN60
Capacity is based on certification testing. Wire size should
1
be determined 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. Once they are seated,
care should be taken in order to avoid over-tighten-
ing them against the poly material.
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-tight-
ened. Appropriate tools and tightening torques are
indicated in Table 4. NOTICE: Do not back termi-
nal screws completely out.
Table 4 - Recommended Tightening Torques
600VAC
Terminal
5A* 5A* (550V max)
DXN20
DXN30
DXN30
DXN60
DXN60

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.
DANGER
CAUTION
1
Main Contacts Aux. Contacts
Max Min Max
10 16 N/A
6 14 10
4 10 10
Inches mm
0.50/0.50 12/ 12
0.79/0.83 20/21
0.67/0.67 17/17
0.79/ 0.83 20/ 21
0.67/0.83 17/ 21
Torque Flat Screwdriver
7.1 in-lbs 1/8" precision tip
10.6 in-lbs 3/16" precision tip
(Main Contacts)
7.1 in-lbs 1/8" precision tip
(Aux. Contacts)
22.0 in-lbs 3/16" precision tip
(Main Contacts)
7.1 in-lbs 1/8" precision tip
(Aux. Contacts)
Flexible cord connected devices must be equipped
with a flexible cord listed for extra hard usage and
terminated with listed fittings in accordance with all
applicable local and national electrical codes. See
table 6.
Table 6 - Flexible Cord
Type
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
- AWG
* Note: Consult NEC for short circuit limits
2
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.
Threaded
Adapter
Bushing
Strain
Relief
Handle
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 recep-
tacle (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.
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.
Flexible Cable Range
Max Nos of
Conductors
Max Øin Min Øin
5 0.812 0.312
Rating Fuse Type*
25 kA@600VAC RK1 30A
25 kA@600VAC RK1 70A
25 kA@600VAC RK1 100A
Finger Drawplate Gasket
Finger Drawplate
Color-Coded Receptacle
Gasket (or Inlet)
Assemble the