Ventilation; Accessibility; Transformer Sound Levels; Cable Connections - HPS DH Série Guide D'installation, D'utilisation Et D'entretien

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Ventilation

WARNING
Failure to follow the ventilation instructions can
result in death, serious injury or property damage.
Transformers are required to be installed in an area where
they can be cooled by means of free air circulation with
the average ambient temperature of 30°C (86°F) which
should not exceed 40°C (104°F) at any time.
Adequate ventilation is essential for transformers
to meet their nameplate kVA capability. The distance a
transformer should be located away from any wall or any
other obstruction is stated on the nameplate.
The minimal distance is required to allow free, clean
circulation of air through the ventilation openings or
around a non-ventilated unit. No other obstructions, line/
load cables or ventilation blocking structures are allowed
in the ventilation space.
Where bottom entry is allowed for cables, the space
used for conduits in the front of the transformer should
not obstruct more than 50% of the front ventilation area
defined between the bottom plate and the supporting
legs. Please see the Cable Connection Requirements
section on page 6 for instructions.

Accessibility

CAUTION
Failure to follow accessibility instructions can result in
injury and/or property damage.
NEC standards require that transformers be
accessible for inspection and located accordingly.
However, transformers should not be located in
areas where stored items are likely to interfere with either
natural air convection or the capability to have them
inspected. Passage ways or other areas where people
could be exposed to live parts during inspection should
also be avoided.
Adequate protection should be provided under any
circumstances.
Installation, Operation, and Maintenance Guide - Low Voltage Transformers

Transformer Sound Levels

Transformers are an electrically energized apparatus
and by their nature during normal operation will emit a
certain level of sound.
Transformers are required to meet NEMA standards
for the maximum sound levels permissible. These sound
level standards vary from 40 to 67 dB and as such may be
an annoyance if located in close proximity to where people
work or reside.
Care should therefore be exercised in selecting sites
for transformers particularly in sensitive areas like hospitals,
classrooms, medical or office facilities.
The following guidelines may be helpful:
Units should be mounted away from corners or
reflecting walls or ceilings.
Cable or other flexible conduit should be considered
to make the incoming/ outgoing connections.
All dry-type transformers are provided with isolation
anti-vibration pads between the core and coil
assembly and the enclosure. However, sound
absorbing vibration isolators may also be installed
between the transformer and its mounting surface.
Depending on the environment, to reduce noise
acoustically absorbing materials could be considered
for walls and ceilings around the unit.
The location of the unit should be as far as practical
from areas where sound levels could be considered
undesirable.

Cable Connections

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC
FLASH
Failure to follow these instructions will result in
death, serious injury or property damage.
Never attempt to change connections or taps unless
the transformer is de-energized and all windings
grounded.
6

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