WaveStar Static Transfer Switch 2000A 3-Pole
22
Ctrl Nr: PM375118-004
2.6
Surge Protection
The STS will safely withstand without mis-operation or damage:
•
Transient voltage surges on either AC power input as defined by ANSI/IEEE C62.41 for Category
B3 locations (high surge exposure industrial and commercial facilities)
•
Electrostatic discharges (ESD) up to 10 kV at any point on the exterior of the unit
•
Electromagnetic fields from portable transmitters within 3 feet (1 meter) of the unit
2.7
Grounding
Grounding is primarily for equipment and personnel safety, although proper grounding also enhances
equipment performance. Improperly grounded systems can not only create unsafe conditions, but also
electrical noise that can cause data processing and transmission problems.
2.7.1
System Grounding
The system includes a computer grade single-point ground in accordance with FIPS Pub 94 and the
requirements of the NEC. (See Figure 5, STS 2000A 3-Pole One-line Diagram.)
All input and output power feeds must include an equipment grounding means as required by the NEC
and local codes.
2.7.2
High Frequency (RF) Grounding (Computer Rooms)
In addition to the power grounding system, a reference grounding system for high frequency noise is
desirable (with the two systems being bonded together for the same reference potential). A grid made up
of 2-foot squares will provide an effective signal reference grounding system. The raised floor can be
utilized if it has solidly connected metal stringers ensuring good electrical connection. If this type of floor is
not available, a grid can be fabricated by laying a mesh (2-foot squares) of braided copper strap directly
on the concrete sub floor (electrically connected at each intersection point). The frames of all the data
processing equipment, including the STS, should be connected (by the shortest possible distance) to the
reference grid with braided copper strap. Finally, the signal reference grid should be bonded to the
WaveStar for a single point equipotent ground reference
For optimum performance all distances for power and high frequency grounding should be kept to an
absolute minimum. To summarize, a radial grounding system of this type (utilizing a single ground point)
will insure that your facility is electrically safe, complies with all code requirements, and will be essentially
free of ground caused computer noise and problems.
Grounding for the WaveStar Static Transfer Switch must comply with
local building codes and National Electric Codes.
