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Prior to energization of the SPD, it is critical that the
following items have been addressed. Do not attempt
to energize the SPD or continue with the installation
if all these conditions have not been met, or are unknown.
1. System configuration and voltage
CAUTION
Prior to installation, ensure the system configuration
and voltage is equivalent to the SPD unit being installed.
Avant l’installation, assurez-vous que la configuration et
la tension du système sont équivalentes à celles du SPD
en cours d’installation.
The SPD model number can be found on the UL label
affixed to the SPD enclosure. The SPD selection can be
verified by comparing the model number to the correct
electrical system described in the “VOLTAGE RATINGS
AND POWER SOURCE CONFIGURATIONS” chart.
2. System grounding and bonding
Verify that an NEC (National Electrical Code) compliant
X0 bond has been made at the upstream transformer
or other separately derived system that feeds the SPD.
Per NEC Article 250.30, this bond must be in place on
all 3-Phase WYE, 3-Phase Hi-Leg Delta and Single-Phase
Split-Systems. Refer to diagram "EXAMPLE OF AN NEC
COMPLIANT GROUNDING ARRANGEMENT FOR A
SEPERATELY DERIVED SYSTEM" for an example
of an installation that complies with these NEC
recommendations.
Verify that there have not been multiple instances
of neutral-to-ground bonds on the electrical system.
These bonds, while either intentional or accidental,
result in ground currents that can create differential
voltage potentials between neutral and ground.
Redundant neutral-to-ground connections can result
in damage to the SPD and are in violation of the NEC.
—
Pre-installation requirements
3. SPD installation on ungrounded power systems
Ungrounded power systems are inherently unstable
and can produce 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 that 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.
4. SPD location / primary overcurrent protection
Per the National Electrical Code (NEC Article 285), Type 2
SPDs are allowed to be placed on the load side of the main
service breaker/fuse.
G U I D E TO I N S TA L L AT I O N A N D A SS I S TA N C E , P R E- I N S TA L L AT I O N C H EC K L I S T
