Meltric DXN30 Operating Instructions Manual

ENGLISH OPERATING INSTRUCTIONS
Consignes D'utilisation
DX
DXN SERIES
©2019 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
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.
There are inherent dangers
associated with electrical
products. Failure to follow safety precautions can result in
serious injury or 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.
RATINGS & CERTIFICATIONS
To ensure the safe use of this product, the
installer must verify that the product is properly
rated for the application.
The amperage and voltage ratings are indicated on
the device labels. Some DXN devices are provided
with optional auxiliary contacts that make after and
break before the phase contacts. The ratings for
auxiliary contacts are shown in Table 1.
Hazardous Duty Ratings
Table 1 - Auxiliary Contact Ratings
Device 120VAC 240VAC 480VAC
DXN30,60 5A* 5A*
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.
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.
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.
INSDXN N
Table 2 - Wiring Terminal Capacity
DXN20
DXN30
DXN60
Capacity is based on certification testing. Wire size
1
should 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 and fully seat
the gasket/s. Once they are
should be taken in order to avoid over-tight-
ening
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
600VAC
3. Wiring terminals are spring assisted to prevent
5A* 5A* (550V max)
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
DXN30
DXN60
DXN60
- AWG
1
Main Contacts Aux. Contacts
Max Min Max
10 16 N/A
6 14 10
4 10 10
seated, care
them against the poly
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)
17.7 in-lbs 3/16" precision tip
(Main Contacts)
7.1 in-lbs 1/8" precision tip
(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 hard usage and terminated
with listed fittings in accordance with all applicable
local and national electrical codes. See table 6.
Table 6 - Flexible Cord
Max Nos of
Type
Conductors
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 25 kA@600VAC
DXN30 - 30A 25 kA@600VAC
DXN60 - 60A 25 kA@600VAC
2 When DXN's are used as in-line connectors, finger
* 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
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
Bushing Adapter
material.
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 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.
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.
Flexible Cable Range
Max Øin Min Øin
5 0.812 0.312
Rating Fuse Type*
RK1 30A
RK1 70A
RK1 100A
Finger Drawplate Gasket
DXN20 Remove Adhesive Liner
Finger Drawplate
Color-Coded Receptacle
Gasket (or Inlet)
Assemble the