Mardix Switchgear
Mardix Switchgear iPDU Specification Switchgear Specification
Mardix LV Switchgear Technical Specification
Enclosure
Mardix LV switchboards comprise one or more
vertically mounted sections. The sections are generally slab
mounted, however, options for mounting on underfloor/raised plinths
can be accommodated.
Our enclosures are formed from individually
folded panels of Zintec sheet steel, which are fully welded and
ground to provide clean lines and maximum rigidity. The Mardix high
integrity earth bond is standard.
An integral 150mm plinth is then welded to the
base of the cubicle to provide a solid support channel which enables
the switchboard to be mounted on a separate underfloor plinth.
Enclosure finish: Cabinets and doors are powder
coated with RAL colours or BS4800 colours with a smooth finish
whilst internal compartments feature RAL 9003 (white) with a ripple
finish. Ingress Protection ratings (IP rating) is
IP31 as standard. Higher ratings are available.
Access & Cableways
Switchboards can be front access only, when
mounted against a wall, or front and rear access where space allows.
Cable access is usually via the top or bottom and transition
glanding boxes can be used should cables be routed perpendicular to
the vertical face of the switchboard. Front and rear cableways are
used to secure and route all customer cables.
Forms of Separation
Each functional unit is, in general, separated
from each other. By opening the door of the respective functional
unit e.g. an ACB compartment, it isn’t possible to inadvertently
touch live parts. All exposed live parts are shrouded using
proprietary or custom-made shrouds. Separation will be achieved in
accordance with IEC 61439. The exact Form of Separation e.g. Form 4
Type 2, Form 4 Type 6 will be as specified.
Separation will generally meet the following
conditions:
-
Protection against contact with live parts
belonging to adjacent functional units
-
Limitation of the probability of initiating
arc faults
-
Protection against the passing of solid
foreign objects from one function unit to another
-
Mardix internal separation will generally be
achieved using rigid metallic barriers. Unless otherwise
specified, busbars will be separated from functional units
Busbars, Fault Ratings & Connections
Using our unique ventilation duct system, Mardix
busbar assemblies are naturally cooled and ASTA certified up to 6300
Amperes. Forced cooling is not required in any of our mains incoming
sections.
A wide range of current and fault ratings are available including
1250A (50kA for 1sec), 4000A (80kA for 1sec) and 6300A (100kA for
1sec). Busbars are air insulated. The neutral
busbars have the same rating and cross sectional area as respective
phase busbars.
Individual riser busbars are suitably sized for
the devices they serve, but are not necessary of the same rating as
the main busbars.
Busbars can be extendable at the ends of the
switchboard in order to facilitate easy installation of future
cubicle extension sections.
Busbars are clad along their entire length. It is
not be possible to come into contact with the busbars by opening any
compartment doors, including busbar sections.
Tap-off connections from the main busbars to
individual circuit breakers (up to 630A rating) are manufactured
using insulated flexible copper links. This reduces the risk of
short circuit at points on the busbar system that may be prone to
high short circuit currents.
All power connection points, including busbar
joints are tightened to the correct torque in accordance with Mardix
double marking standards.
Thermal Imaging
Thermal imaging ports are punched directly into
the steel doors using CNC cluster punching. The ports are fitted
with sliding captive covers, fixed and sealed to the door by
security screws. A special tool is required to open the port.
Polycarbonate custom-made shrouds are fitted over
all connection points to prevent inadvertent touching of any live
parts and to facilitate safe thermal imaging.
Devices
All major brands of Air Circuit Breakers (ACBs),
Moulded Case Circuit Breakers (MCCBs) and Fuse Switches can be
incorporated into our LV switchboards, including Schneider, Terasaki,
ABB and Socomec. ASTA testing has been successfully conducted on
various arrangements of devices including stacking of 3200A ACBs and
high density mounting of MCCBs. Power Quality
Integration of tuned and detuned power factor
correction (PFC) and active harmonic filters (AHFs) can be
incorporated into our LV switchboards. PFC is suitably sized for the
application and then mounted into the switchboard suite along with
the associated Current Transformers (CTs) and control relays.
AHFs are used to mitigate harmonics in the
electrical system and are sized according to the harmonic content
generated. Care must be taken when selecting both PFC and AHFs in
the same LV switchboard. Detuned PFC with reactors must be used in
this case. Although most PFC and AHF are integrally mounted,
standalone units are available to mount remotely from the LV
switchboard. Metering, Control & BMS
Usually housed in its own section within the LV
switchboard the following can be incorporated:
-
High end power quality metering systems such
as Schneider Powerlogic ION7650 & ION7550
-
Multi function metering such as Socomec,
Schneider & Autometers
-
Specialist Protection Relays e.g. Restricted
Earth Fault Relays & G59 protection
-
LED indicators
-
Pushbuttons & Keyswitches
-
Transformer Temperature Relays
-
Electronic Surge Protection
-
Relays & Protection Fuses as applicable
-
BMS & Control Terminals
Discrimination Studies
On large projects Mardix often play a key role in
the coordination of the complete electrical system including the HV
elements right through to the final LV distribution boards. Our
technical support team have extensive experience dealing with
selection and discrimination of devices. Please call us for more
information Tel 01539 720161.
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Specification Switchgear Specification
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