ABB OVRHLD Series Manual de instalación, uso y mantenimiento - Página 5
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Installation
Electrical Service
The OVRHLD surge suppressor shall not be
connected to an electrical service with an available
short circuit current of more than 65,000A rms.
The OVRHLD does not require an upstream over
current device. If one is used, we recommend 200A
maximum. The interrupt rating of the device shall
not be less than the available short circuit current.
The OVRHLD suppressor is intended to be used only
on grounded electrical services where the neutral
is bonded to ground at the service entrance (types
USA and TN-C-S) or bonded to ground at the source
and the source grounding conductor is connected to
site ground (type TNS).
The OVRHLD suppressor can be installed on 2-wire
and 3-wire single phase, and 4-wire three phase
services. See diagrams on facing page.
Location
The OVRHLD suppressor may be installed on the line
or load side of the main service disconnect. It can be
located indoor or outdoor. If installed outdoors in
hot climates, avoid direct sun exposure. Orient the
unit so the functional status lights are visible. This
unit cannot be employed on a flush mounted load
center with a finished wall surface.
Connection
Mount through 1/2" knockout (12.7 mm) in the
electrical panel and secure with lock nut. Black wires
connect to phase (hot), white wire to neutral bar,
green/yellow wire to ground bar. Not all models will
have all wire colors.
The black or brown (hot) and white or blue (neutral)
wires may connect across the main lugs or buses in
the panel (if so provisioned with connection means).
The suppressor can also be connected to a double
ganged breaker suitable for use with #14 wire – this
method allows the device to be isolated for test or
replacement without de-energizing the electrical
service. Use 20A min circuit breaker at main panel,
use 10A min at subpanel. To optimize protection
levels, this breaker should be adjacent to the panel's
main lugs or main disconnect breaker. Minimize
suppressor wires length and avoid unnecessary
bends in suppressor wires.
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