Maintenance Tips & Tricks - 2000 - #6

08/01/2000


Finding faults
Problem: Is there an easy way to locate a ground circuit fault in electrical wiring for a 120-V circuit?




Solution: Install a pig-tail lamp holder with an inserted bulb in series with the faulted wiring to quickly isolate the ground fault.

1. Turn off the circuit breaker and remove the load wire and connect it to one of the pig-tail wires. The second pig-tail wire is connected to the breaker.

2. Turn the breaker back on and the bulb should light, which indicates a suspected ground fault.

3. If possible, start by disconnecting half of the entire circuit at an accessible outlet box. If the light stays on, the fault is in the part of the circuit that is still energized. If the light shuts off, the fault is downstream from the energized portion and should be reconnected to proceed with the test.

4. Continue to disconnect circuit wiring until the ground fault is pinpointed and subsequently isolated for repair.

5. Repair the wiring and reinstall the load wire on the circuit breaker.

This procedure can be undertaken by one electrician, but works best with two equipped with radios. One electrician remains at the breaker panel to watch the test light and turn off the breaker as required, and the other works on the faulted field wiring.

Contributor: Warren Moulaison, Central Campus Maintenance Supervisor, Department of Facilities Management, Dalhousie University, Halifax, Nova Scotia, Canada; 902-494-3891; wmoulais@csbfacmgt.csbfm.dal.ca





List of Tips & Tricks


Plant Engineering





No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Safer human-robot collaboration; 2017 Maintenance Survey; Digital Training; Converting your lighting system
IIoT grows up; Six ways to lower IIoT costs; Six mobile safety strategies; 2017 Salary Survey
2016 Top Plant; 2016 Best Practices on manufacturing progress, efficiency, safety
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Big Data and bigger solutions; Tablet technologies; SCADA developments
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
What controller fits your application; Permanent magnet motors; Chemical manufacturer tames alarm management; Taking steps in a new direction
Commissioning electrical systems; Designing emergency and standby generator systems; Paralleling switchgear generator systems
Package boilers; Natural gas infrared heating; Thermal treasure; Standby generation; Natural gas supports green efforts

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Motion control advances and solutions can help with machine control, automated control on assembly lines, integration of robotics and automation, and machine safety.
This article collection contains several articles on preventing compressed air leaks and centrifugal air compressor basics and best practices for the "fifth utility" in manufacturing plants.
Maintenance Manager; California Oils Corp.
Associate, Electrical Engineering; Wood Harbinger
Control Systems Engineer; Robert Bosch Corp.
click me