Industry Standards Changes - 2009; Equipment Performance; Voltage Rating; Figures Figure 1: Spd Types - Siemens TPS3 01 Internal Manual

Industry Standards Changes - 2009

UL 1449 Third Edition and 2008 NEC® Article 285 generated substantial
changes.
• The term TVSS changed to SPD
• Types 1, 2, 3 & 4 SPDs are created
• UL 1449 clamping voltage performance testing changed from
500A to 3,000A
• UL 1449 added new Nominal Discharge Current testing (I nominal,
or I ), which consists of more rigorous duty-cycle testing
n
The SPD Type category is important to understand before installing
any SPD. Type 1 and 2 SPDs are fully UL Listed devices whereas Type
4 SPDs are UL Recognized devices.
Type 1 – Installed on line or load side of the Main Overcurrent Protection
(OCP), similar to obsolete products known as Secondary Surge Arrestors,
except now includes rigorous safety testing. Includes all OCP & safety
disconnectors inside the SPD.
Type 2 – Installed on load side of the Main OCP, similar to previous
products known as TVSS. May or may not require external OCP.
Type 3 – Point of Utilization, direct plug in type devices, surge strips,
etc. Theses devices are intended for installation 10 meters from the
panel (rationale based on IEEE Cat. A location).
Type 4 – Surge suppression components, could be a basic component
or a complete module. Type 4 components can be tested for Type 1,
Type 2 or Type 3 applications.
Figure 1: SPD Types
NEC® Art 285 & UL 1449-3
SPD Types: Types 1, 2, 3, & 4
Based on Location within electrical distribution system
(also coincides with ANSI / IEEE C62.41.2 - 2002 Categories C, B & A)
Siemens TPS3 SPDs have the following Type designations

Table 1: Type Designations

SIEMENS TPS3 SERIES
TPS3 01 & L1
TPS3 02 & L2
TPS3 05 & L5
TPS3 06 & L6
For further information, please review latest editions of NEC® Art. 285,
UL 1449, contact your local Siemens sales office or contact Siemens
TPS Tech Support at (888) 333-3545.

Equipment Performance

As SPDs sense overvoltage, they create a momentary internal short
circuit, thereby redirecting harmful surge energy to earth ground.
SPDs are capable of repeating this function repeatedly. For optimum
protection, staged surge suppression should be implemented at the
service entrance and all other distribution or panelboard locations
feeding sensitive equipment.

Voltage Rating

Prior to installing the TPS3 SPD, verify that the unit has the correct
voltage rating for the equipment installed by checking the nameplates
of both the equipment and TPS3 module. The service type should
match the intended power source. See Table 2 on the following page
for voltage applications.
TYPE RATING
Type 1 Component Assembly
Type 1 Component Assembly
Type 1
Type 1 Component Assembly
2