Isolated Grounds and Dedicated Circuits
It is often easier to isolate sensitive electronic equipment than to re-wire an entire circuit.
This can be done by running an isolated ground for the equipment in question, or by
running a new dedicated circuit.
An isolated ground protects the equipment from other equipment on the same grounding
circuit. Electronic equipment can create noise, which can interfere with the operation of
other equipment on the circuit. It is important to note than an isolated ground will not
protect equipment from harmonic distortion running through a shared neutral.
In some cases, running a dedicated circuit is necessary to completely isolate a piece of
equipment in order to ensure protection.
Branch Circuit Testing
The hidden dangers associated with branch circuit wiring are very serious, but
fortunately the precautions are straightforward. We can protect ourselves and
equipment by using certified devices and testing equipment from reputable
manufacturers and implement policies on branch circuit testing. These policies should
include verifying proper wiring, testing devices, checking the integrity of the branch
circuit, and measuring the integrity of the grounding system.
Check all devices immediately after installation to verify proper wiring and test devices.
Receptacles should be checked to avoid common wiring errors, such as reversed
polarity or an open neutral. Checking the voltage level with a voltage tester quickly
verifies that the receptacle has been correctly wired for either 120 or 220VAC. Checking
continuity across a switch verifies that it working correctly. A variety of testers are
available on the market to test these devices quickly and accurately.
Test electrical circuits under load to test the integrity of the branch circuit. The voltage
drop test can identify high resistance connections, which can lead to fires, breakdown in
insulation, and poor efficiency of the electrical system, which can contribute to erratic
equipment operation.
Test the integrity of the grounding system, which includes not only the grounding
conductors, but also the ground rod or grid system. A low impedance on both of these
systems is essential to protect against electrical shock.
In summary branch circuit testing is an important part of wiring any circuit. It verifies that
devices have been wired up correctly and allows you to protect yourself against the
hidden defects in an electrical system.
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