Specifications - State of Delaware

SECTION 264300 - TRANSIENT VOLTAGE SURGE SUPPRESSION (TVSS): continued
4. Internal connections associated with the suppression filter system and subject to surge
currents shall be made with solderless compression type lugs and shall be bolted to the
bus bars in order to reduce overall system impedance.
5. No plug-in component modules, quick-disconnect terminal, nonfield replaceable fusing,
or printed circuit boards shall be used in surge current carrying paths.
C. Unit Status Indicators:
1. The unit shall include externally visible LED visual status indicators that monitor the online
status of each phase of the unit.
2.03 TVSS PERFORMANCE AND TESTING:
A. TVSS maximum continuous operating voltage (MCOV) shall be capable of sustaining 115% of
the facility's nominal operating voltage continuously without degradation.
B. Protection Modes: In accordance with NEMA standard LS 1, the unit shall provide protection
in all modes. Wye configured systems shall provide Line-to-Neutral, Line-to-Ground, Line-to-
Line, and Neutral-to-Ground protection. Delta configured systems shall provide Line-to-Line
protection in ungrounded systems, and Line-to-Line and Line-to-Ground protection in
grounded systems.
C. Single Pulse Surge Current Capacity: Based on ANSI/IEEE C62.41 and in accordance with
NEMA Publication No. LS-1-1992 [R2000], the tested single pulse surge current capacity, in
amps, for each mode of protection of the unit shall be no less than as follows:
Exposure Level L-L L-N L-G N-G
Panelboard Prefix
Designations
Distribution Panelboards 80,000 80,000 80,000 80,000 SE, SEP, SW, WLP, 2LP
Branch Panelboards 50,000 50,000 50,000 50,000 ESP, SH0, WSP, 2SP
D. Unit Suppression Voltage Ratings: The TVSS published suppression voltage ratings shall be
the UL 1449 listed suppression voltage ratings tested and assigned by Underwriters
Laboratories.
UL 1449 Ratings
UL 1449 Suppression Voltage Rating
Electrical System Voltage Phases without fused disconnect with fused disconnect
120/208 3 400V 500V
277/480 3 800V 1,000V
480 3 1,500V 1,500V
An additional rating of 330V can be achieved for 120/208V systems when two or more units
are used with a separation of at least 100 feet.
E. High Frequency Extended Range Power Filter:
1. The unit shall include a high frequency extended range power filter and shall be UL 1283
listed as an Electromagnetic Interference Filter.
2. The filter shall reduce fast rise-time, high frequency, error-producing transients, and
electrical line noise to harmless levels, thus eliminating disturbances which may lead to
electronic system upset.
3. The system shall be tested to MIL-STD 220A for electrical line noise attenuation per
50 Ohm insertion loss measurement method of RF frequencies up to 100 MHz.
DEAN264300.DOC 264300-3