Installation, Operation and Maintenance Manual
IO-70103 RevE 08-17
8
NEC Considerations:
The following is from the National Electric Code 2008 Edition.
NEC 285.21 Connections
NEC 285.23 Type 1 SPDs.
Shall be installed in accordance with 285.35(A) and (B).
A. Installation. Type 1 SPDs shall be installed as follows:
1.
Type 1 SPDs shall be permitted to be connected to the supply side of the service disconnect
as permitted in 230.82(4) or
2.
Type 1 SPDs shall be permitted to be connected in Type 2 locations as specified in 285.24.
B. At the service. When installed at the services, the grounding conductor of a Type 1 SPD shall be
connected to one of the following:
1.
Grounded service conductor
2.
Grounded electrode conductor
3.
Grounding electrode for service
4.
Equipment grounding terminal in the service equipment
Voltage Protection Ratings:
To obtain the voltage protection ratings (VPRs), as obtained by Underwriters
Laboratory, Incorporated, in accordance with the Standard for Safety, Surge Protective Devices
(SPDs), Standard 1449, Fourth Edition, marked on this product, the wire size listed for each product must
be utilized to connect the unit to your facilities’ power grid. Connections made with conductors other
than the wire size listed may result in different VPRs.
Circuit Ampacity Limitations:
Representative samples of these products have been investigated by
Underwriters Laboratories, Incorporated to withstand, without exposing live circuits or components
at system voltages and fault currents up to 200,000 AIC, as described in the Standard for Safety, Surge
Protective Devices (SPDs), Standard 1449, Fourth Edition.
System Grounding and Bonding:
The performance and safety of any SPD system is dependent on
proper grounding and bonding. Grounding is required for safety. Correct implementation also enhances
equipment performance. Incorrect grounding can reduce or impede the SPD’s operation. All electrical
circuits to the SPD must include an equipment- grounding conductor as required by the NEC and local
codes.
An insulated grounding conductor is required in addition to any metallic raceway, which may be used as
a grounding conductor. For parallel-connected SPDs, the grounding conductor should be the same wire
size as the associated power conductors.
CAUTION!
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 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. CONTACT FACTORY FOR UNGROUNDED APPLICATIONS.
ATTENTION
– LES SYSTÈMES D’ALIMENTATION NON-MISES À LA TERRE SONT INTRINSÈQUEMENT
INSTABLES ET PEUVENT PRODUIRE DES TENSIONS DE PHASE TRÈS ÉLEVÉES AU COURS DE
CERTAINES CONDITIONS DE DÉFAUT. PENDANT CES CONDITIONS DE DÉFAUT TOUT ÉQUIPEMENT
ÉLECTRIQUE, Y COMPRIS UN SPD (PROTECTEUR DE SURTENSION), PEUT ETRE SOUMIS A DES
TENSIONS SUPERIEURES À LEURS VALEURS STANDARDS. CETTE INFORMATION EST FOURNIE
À L’UTILISATEUR AFIN QU’UNE DÉCISION CORRECTE PEUT ÊTRE PRISE AVANT D’INSTALLER UN
ÉQUIPEMENT ÉLECTRIQUE SUPPLIMENTAIRE SUR UN SYSTÈME D’ALIMENTATION NON-MISE À LA
TERRE. CONTACTER L’USINE POUR LES APPLICATIONS NON-MISES À LA TERRE.
