ATI Technologies AT1826 Посібник користувача - Сторінка 10

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WARNING: If you suspect that the grounding system

in your home's electrical wiring is causing the hum

problem, it is important that you do not make any

changes to the wiring yourself. Only a licensed electri-

cian should make any changes to household wiring,

and they must be made in full compliance with all local

building, safety and electrical codes.

Suggestion #4:

Hum may also be caused by faulty earth grounds in

your home's electrical system. In the past, cold water

pipes were often used for the earth ground, so it is im-

portant to make sure that your ground connection is

still valid and has not become loose or corroded. The

cold water pipe method may no longer be valid in some

locations due to requirements that the water meter be

isolated from the water mains with a length of PVC

pipe, thus interrupting the ground circuit. The safest,

and most reliable, approach may be to provide your

own ground. This can be accomplished by having a

licensed electrician drive at least five feet of copper-

jacketed steel grounding rod into the earth, and using

that for your grounding connection. If the hum persists

after all of the above suggestions have been tried, con-

tact the ATI customer service department for assis-

tance.

AT1820 Manual

Rev-05/21