SPD Manual

Page 3 of 7 10-055-1 REV E Date: 08/27/2018
DANGER: Electrical shock or burn hazard. Installation of this SPD should only be done
by qualified personnel. Failure to lockout electrical power during installation or
maintenance can result in fatal electrocution or severe burns.
CAUTION: Check to make sure system voltages do not exceed the SPD voltage
requirement and the correct SPD voltage/model has been selected.
CAUTION: This unit must be installed in accordance with the National Electrical
Code (ANSI/NFPA-70) and applicable local codes.
CAUTION: Ungrounded power systems are inherently unstable and can allow
excessively high line-to-ground voltages during certain fault conditions. During
these fault conditions any electrical equipment, including an SPD, may be subjected
to voltages which exceed their designed ratings. This information is being provided
to the user so that an informed decision can be made before installing any
electrical equipment on an ungrounded power system.
ATTENTION: les systèmes d'alimentation sans terre sont intrinsèquement
instables et peuvent produire des tensions de ligne trop élevé-sol au cours
de certaines conditions de défaut. Au cours de ces conditions de défaut,
tout équipement électrique, y compris un SPD, peut être soumis à des
tensions qui dépassent leurs notations conçu. Cette information est fournie
à l'utilisateur afin qu'une décision éclairée puisse être prise avant
l'installation de tout équipement électrique sur un système d'alimentation
sans fondement.
NOTICE: Do not cut wires until the SPD is mounted and minimum wire lengths have been verified. All
connection leads should be cut to minimum possible length; never coil or push aside excess length.
INSTALLATION INSTRUCTIONS
1. *Verify system voltage. Measure L-N, L-G, L-L and N-G of the AC system. DC systems measure from positive and
negative input. Confirm that the SPD is correctly rated for the system to which it is to be connected to. Do this by
comparing the measured voltages to the SPD voltage ratings shown on the product’s rating label. The measured
voltage should NOT BE ABOVE the maximum continuous operating voltage (MCOV) of the surge protector device
rating, during normal operation. Some circuits like PV arrays may need to be calculated for worst case maximum
operating voltages.
2. Identify proper location for the SPD. Locate the unit as close as physically possible to the panel being protected
and as close to the electrical connection as possible. Avoid excess lead lengths and the need for sharp bends in the
wires. Refer to fig 1.1 and fig 1.2as an example.
3. Install green wire to the GROUND bus bar. In AC circuits it is not uncommon to connect the green wire to AC
neutral, install the white sleeving over the green wire when connecting to AC neutral. Make sure the green wire
takes the shortest path to earth ground!!
4. Connect phase conductors. The phase wires are black and red in color. The orientation is not critical to the
operation. (AC) With the POWER OFF, connect one wire to AC HOT IN (line) and other wire to AC HOT OUT (load) as
shown in fig. 1.2 (DC) connect the red wire to PV + and the black wire to PV - or battery minus. PV combiners get
installed as shown in figure 1.1
5. Apply voltage to SPD. Both LED’s in the SPD should glow blue as a sign that voltage is present in system, SPD is
connected correctly and working and the system is protected. Note. LED’s will only be on when voltage is present.
In PV circuits the lights will go out at night because arrays are not producing voltage. This does not indicate that the
SPD is broken. If voltage is present and the blue LED’s are off, the SPD needs repair. When connecting one half of
the SPD to PV- and ground, the PV- led will not light. The circuit is protected, but there is normally no voltage
between PV- and ground.
NOTE:
Important! A good grounding system is essential for both safety and lightning protection. The NEC recommends a
ground resistance of 25 ohms or less. The lightning protection industry recommends 10 ohms or less. A thorough
assessment of the grounding system is strongly recommended.