© 2020 ASCO Power Technologies. All Rights Reserved
12
IO-70071
01/2020
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ASCO Model 950 Surge Protective Device (SPD) and Fuse Box
Installation
Model 950 background noise is negligible or non-existent, and does not
restrict the location of installation.
Service clearance is needed at the front of the unit. There are no user
serviceable parts inside the main SPD enclosure. The fuse box fuses can
be replaced as needed. Note that if a fuse has blown, the SPD component
likely needs replacing.
SPDs draw very little current under normal conditions and conduct for a brief
duration upon encountering a transient surge current. This device does NOT
feature an internal overcurrent or overtemperature disconnecting means.
Supplemental overcurrent protection is provided in the form of the fuse box.
Mounting, Dimensions & Weight
Audible Noise
Overcurrent Protection
Service Clearance
MOUNTING, DIMENSIONS & WEIGHT
• Model 950 is a stand alone unit that can be connected anywhere in
the distribution system and is intended for external mounting on a flat
vertical surface.
• The surface must be capable of supporting 75 lbs. (34.5 kg.) + 35 lbs.
(15.9 kg.).
• The enclosure dimensions of the SPD are 12 x 12 x 6 in. (305 x 305 x
152 mm.) and the fuse box are 18 x 16 x 10 in. (457 x 406 x 254 mm.).
Failure to follow these instructions can result in injury.
NOTICE
LEAD LENGTHS & MAXIMIZING SPD PERFORMANCE
• Model 950 must be located as close to the circuit as possible to
minimize parasitic losses. Surges are high current, high frequency
events that cause substantial voltage drops across conductors. Use the
shortest & straightest possible leads. Pre-plan installations so that the
closest connection points are used.
• This SPD is provided with 2 feet (0.61 meters) of #6 AWG and the
fuse box is provided with 8 feet (2.4 meters) of #6 AWG conductor for
all three phases and ground. Once a suitable location for the 950 has
been determined, cut the provided wire to the appropriate length for
connection to the fuse box and to the switchgear. Do NOT coil or pigtail
excess wire. Do NOT cut pre-installed conductors until after installation
is thought through.
• Voltage drops for normal phase conductors might be 2-3V per hundred
feet. In surge applications, voltage drops might be 100-160V per foot
(depending on surge current). These voltage drops add to clamping
voltage, thus hurting performance. Make every effort to keep leads short
and straight.
Failure to follow these instructions can result in equipment damage.
CAUTION
