We have pleasure in introducing ourselves as one of the leading
manufacturer of 1.1KV, PVC power & Control Cables, Flexible & Aerial
Bunched Cables. We are in this field since 1975 Company is an !S / ISO-9001
: 2008 certified, situated at Daman. So the direct user can avail the from
the Exemption of Sales Tax.
Following special tests are most commonly
carried out at present on HMT - PVC FRLS cables.
The conductor shall be composed of plain copper or aluminum wires complying
with IS: 8130-1984. Mining Cables to be used in gassy mines shall be of
copper conductor only.
The conductors are insulated with suitably compounded PVC, which is applied
to the conductor by extrusion process.
Core Identification & Colour Scheme
Cores are identified by colour scheme of PVC insulation.
The following colour scheme is adopted.
One core -
Red, Black, Yellow or Blue
Two Core -
Red and Black
Three Core -
Red, Yellow and Blue
Four Core -
Red, Yellow, Blue and Black (reduced neutral core is
For all cables having two or more cores, a common covering (inner sheath)
is provided over the laid up cores either by extrusion or by wrapping of
plastic or proofed tapes. Single core cables do not require inner sheath.
Depending upon the application, the cables can be armoured. The armouring
can be Round Steel Wire or Steel Strips. In case of cables where diameter
over the inner sheath does not exceed 13 mm, the armour consists of
Galvanished Round Steel Wires; above this size, the armour can be
Galvanished Flat Steel Strips or Galvanished Round Steel Wires as per
customers' requirement. In case of single core cables intended for use of an
A.C. Systems, the armouring shall be of Aluminium Wires/Stripes or any other
Armouring of PVC Mining Cables consist of Galvanised Round Steel
Wires/Strips, but wherever necessary, a few Tinned Copper Wires/Strips are
also included to meet the resistance requirements of armouring for Mining
Over the armouring, or in case of unarmoured mechanical control cables,
over the inner sheath (for single core cables over the insulation), a tough
outer sheath of PVC is applied by extrusion. This is normally Black in
colour. This provides a tough but smooth outer covering to PVC Cables. The
trademark "HMT" along with the year/code of manufactured are
embossed on the outer sheath. Wherever desired the customer name can also be
embossed on the cable. The embossing script repeats at desired length of
electrical control cables
The following code is used for designating the type of cable.
Testing of PVC Cables
|Steel round wire armour
|Steel strip armour
|Steel double round wire armour
|Steel double strip armour
|PVC outer sheath
Testing is a vital part of cable manufacturing and all raw materials and
finished cables are thoroughly tested to ensure quality control. HMT has a
well equipped testing laboratory for carrying out electrical, mechanical and
chemical tests which are required as per relevant specifications. The
various tests as provided in the Indian Standards are carried out on HMT
Cables. These are classified in three different groups:
- Routine Tests
- Type Tests
- Acceptance Test
The following tests constitute Routine Tests, which are carried out on each
and every length of cable before it leaves the factory :
Conductor Resistance Test
This test ensures that conductor resistance is with the specified limits,
thereby ensuring that the continuity of conductor is maintained throughout
the cable length and that the conductor has the required cross section area.
The DC resistance is measured at room temprature and is then corrected to
standard reference temperature at 20°C.
High Voltage Tests
This test ensures that the insulation will safely withstand the rated
voltage within permissible normal operation.
These tests are carried out on samples taken from each production lot. They
are carried out to prove conformity as regards the general qualities and
design to the specification of particular type of cable. These tests are
enumerated in the relevant Indian Standards.
The customers can request the various acceptance tests as provided in the
relevant Indian Standard to be carried out before accepting the cables.