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September 28, 2004
4.
Connect each power circuit to the appropriate wireway power terminal (example below):
Power terminal
Ground the sign
The sign must be properly grounded in order to provide three types of protection:
•
Ground fault protection (see page 19) — The sign must be wired to provide a permanent, low impedance
pathway to carry sign ground fault current. This is necessary in order to quickly clear a sign ground fault
by opening the power circuit to the sign.
Earth grounding a sign through some type of ground rod bonded to the sign is not sufficient ground fault protection.
•
Lightning strike protection (see page 20) — A sign must be earth grounded either through an existing
ground rod or separate ground rod(s) bonded to the sign (see NEC Article 250.32).
•
Electronic equipment protection (see page 20) — An improperly wired sign could radiate electromagnetic
fields (EMF) that may damage or interfere with electronic equipment in or near the sign (see NEC Article
250.6).
18
AlphaEclipse 3600 Series A Sign Installation Instructions (9711-8001C)
Figure 4: Wireway power terminal
Figure 5: Wireway grounding points
In this example, this is the Circuit #2
power terminal, which in this case
requires a 19.4 amp circuit.
One of the wireway
grounding points
should be connected to
earth ground (for example,
a grounding rod).
Installation
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