into manufacturing a wide range of standardised as well as tailor made
equipments in voltage grade up to 11
- DG Control Panels
- Power Control Centres
- Motor Control Centres-drawout
- Lighting and Power Distribution
- Busducts up to 11 KV,
current ratings up to 5000 Amps Segregated, non-segregated and isolated
- Plant and Building Automation
panels with SCADA
- Outdoor Kiosks
- Neutral Grounding and
Surge Suppressor Panels
- Turbine Auxiliary Control
- Protection, Relay and
Metering Control Panels
- Process Flow panels
- Control Desks
- Special purpose panels
are built out of cold rolled and cold annealed steel
sheets in 14 gauge for frames and 16 gauge basically for partitions. Panels
are of welded non-bolted construction to facilitate specific tailor made
layouts. Panels with angle iron framework can also be offered on specific
All sheet steel undergo a phosphating treatment
process of degreasing, derusting, phosphating and passivation in a seven
tank process. Powder coating is adopted as a standard and unless otherwise
specified, panels are painted in RAL 7032 Siemens grey shade.
On specific requests, panels can also be supplied in standardised modular
enclosures Rittal. MPP makes.
The busbars are liberally
rated and proper design factors for higher ambients, enclosure conditions,
number of busbars, short time current capability etc., are all considered
while arriving at the sizing.
PVC colour coded heat shrinkable sleeves are generally provided as a standard
practice. In certain cases, busbars are painted with matt black with phase
identification to allow for higher heat dissipation.
In order to ensure proper heat transfer of overlapped joints, precautions
by way of cleaning, greasing, usage of high- tension bolts, with tightening
by torque wrench are adopted.
Busbars shall generally be of electrical grade Aluminium with 99.5% purity.
Alternatively, Copper busbars EC grade with 99.9% purity can also be provided
on clients request.
Busbar supports shall be
of SMC or DMC. Finger type supports are adopted for main horizontal and
vertical busbars to provide the requisite strength and rigidity to withstand
Epoxy moulded conical supports are provided for feeder lines.
A proper spacing and selection of the supports ensure that panels withstand
the appropriate or specified short circuit levels.
Panels are designed to
have adequate clearances between live parts and between live parts to
earth. These are generally far higher than that specified in the relevant
In many cases, due to constraints arising out of inadequate clearances
available in certain components, FRP barriers are provided to enhance
Additionally, to increase safety levels specially with regard to operating
and maintenance personnel, hylam barriers are liberally used to prevent
any inadvertent and accidental contact with live parts, for e.g. at cable
terminations, feeder components, etc.,
In case of feeder ratings
above 63 Amps, terminations are by means of staggered busbars to prevent
fouling of phase and neutral cores. Up to and including 63 Amps. Elmex
melamine stud type terminal blocks are used.
Terminal blocks are located in the cable
alleys wherever provided and wiring from the feeder units to the terminal
blocks are carried out by single core flexible PVC copper cables.
Separate control terminal blocks located away from the power terminals
for motor controls facilitate proper interconnecting control cabling to
local stations and drive motors.
Internal wiring within
the panels, colour coding, etc., both for the mains and auxiliary wiring
shall generally be as per IS:375 Standards.
Wiring is properly identified by ferrules at both ends. The wiring is
carried out neatly and for longer lengths, largely run in PVC slotted
cable troughs in such a way that it does not hinder maintenance.
Wiring terminals are of crimped type. Wiring is carried out with 1.1 kv
grade flexible copper cables - 2.5 sq mm and 1.5 sq mm for CT and PT secondary
FRLS or heat resistant cables are also offered against specific requirements.
The panels are well laid
out with proper compartmentalisation and segregation for feeders, cable
terminations, metering and protection, busbars, cable alleys, etc., The
layouts are such that damages if any caused due to short circuits are
localised and contained.
The power and control lines run neatly, away from each other. All control
components-with proper identification to its circuitry-are so mounted
to render easy maintenance and accessibility.
Conditions as prevailing at site also receive due consideration while
planning the layouts. All necessary interlocks both for the feeder component
itself and also between the components and the panel are provided.
The operational interlocks and sequences are tailor built to suit individual
An earth bus of adequate size-either Aluminium or Copper-is run throughout
the length of the panels and directly mounted on to the panel frames.
The earth terminals of components are connected to this earth bus. The
earth bus generally protrudes at both the ends to facilitate earthing
A braided copper flexible connects the hinged doors with the fixed part.