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CR4 - Recent Forum Threads and Blog Entries

Recent content from CR4, The Engineer's Place for News and Discussion

Published: Sun, 21 Jan 2018 11:57:14 EST

Copyright: Copyright 2018

Suitable Class of Surge Protective Device

Sun, 21 Jan 2018 11:57:14 EST

Main power supply to LV Distribution Circuit come through underground cable. This cable directly come from a transformer and there is no surge protection device at the transformer (secondary side). What is the class of surge protective device should I use at the incoming supply of the LV Distributio

Block Function

Sun, 21 Jan 2018 03:35:43 EST

can i use block function programming on an Arduino?

Starting a 30KW Motor by Soft Starter

Sun, 21 Jan 2018 03:22:45 EST

Hi; We have a trim waste blower at Corrugator machine which has a 380V, 30KW, 4pole AC motor which drives an impeller by the mean of V-belts with double of motor speed. Previously motor was running by star delta starter. As we can not go beyond 6-7 start/stop per hour for such kind of load, so duri

Drone Uses

Sat, 20 Jan 2018 23:58:06 EST

The use of drones along our southern border is the best use so far. Drones, once thought of as toys, have proven their real worth. they are used by our military at good advantage. They are a great tool for electric companies.

BOSCH EDC7C4 Wiring Diagram

Sat, 20 Jan 2018 19:52:00 EST

Thank you honorable members. Let us have access to the wiring diagram of Mitsubishi ME222389, MITSUBISHI FUSO TRUCK BUS CO ME225157 ORDER NUMBER 0281020035 E.C.U.(Engine Control Unit).

Wind Load for ISO Shipping Container

Sat, 20 Jan 2018 16:41:31 EST

Hi All , I need help calculating mph wind load to overturn a 20 ft and a 40 ft shipping container with the following specs. 40 ft -- 8ft wide 9.5 ft tall. Weight. 9200 lbs ---- and a 20 ft 8 ft wide 8.5 ft tall. 5200 lb. These are tare weights Thanks

Star Delta Starter

Sat, 20 Jan 2018 13:45:59 EST

what will happen if the motor meant for delta connection is made to run in star for longer periods. whether motor will fail or continue to run.

Train Brake System vs Semi Systems

Sat, 20 Jan 2018 12:40:44 EST

On a semi tractor trailer,the brakes are applied by default if air pressure fails. Air pressure is required to release the brakes,but on trains,air is required to apply the brakes. Anyone know why this is the way the braking systems were designed on trains? It seems like safety has taken a back s

Yokogawa Centum VP FCS Problem

Sat, 20 Jan 2018 03:38:43 EST

Hi! We got a Yokogawa Centum VP DCS that has been shutdown for 2 months. After powering the system last week, a Communication Error: FCS is down error occured. Anybody can help me clear this problem? Thanks in advance!

Protection of HV Air Core Dry Type Reactors

Fri, 19 Jan 2018 16:49:15 EST

Hello, We are installing a 30MVAR 230kV shunt air core dry type reactor to be connected to a Transmission Line for voltage control, and I am trying to determine protection requirements for the reactor. I have the following questions: 1) What kind of protection should be provided for shunt dry type

The High-tech Skin Care Aisle

Sat, 20 Jan 2018 05:00:00 EST

When I imagine the latest in electronic innovation being unveiled last week at the Consumer Electronics Show (CES) in Las Vegas, I didn’t exactly expect electronic innovation at the beauty counter. Yet, lo and behold, skincare company Neutrogena managed to find a way to make us feel badly abou

Caption This for 1/19/2018

Fri, 19 Jan 2018 21:45:00 EST

Here's this week's image: Thanks to HUSH for the submission.

Guess the Architecture for 1/16/2018

Tue, 16 Jan 2018 19:00:00 EST

This week's building submission is courtesy of SolarEagle. Are you able to identify this building?

Woman of the Week – Florence Nightingale

Tue, 16 Jan 2018 13:57:07 EST

Florence Nightingale was a social reformer, statistician and likely most known as the founder of modern nursing. Her work is going to be showcased in an upcoming film played by Mad Men star Elisabeth Moss. Nightingale was a trailblazer in nursing who greatly affected 19th- and 20th-century policies

Commercial Grade Rubber vs. Specialty Rubber: Make the Right Choice

Mon, 15 Jan 2018 19:16:11 EST

Commercial grade rubber provides sealing and insulation for a wide variety of applications. Compounds such as commercial grade EPDM, silicone, and neoprene also cost less than specialty rubber materials that meet standards, approvals, or regulatory requirements from organizations such as ASTM Intern

What to Ask Before Hiring A Surplus Inventory Liquidation Service

Sun, 14 Jan 2018 05:00:00 EST

There are a lot of companies out there that offer surplus liquidation services. When hiring a service, there are three important questions to ask before moving forward. 1. Are you selling your surplus inventory to a real company? There are many companies out there that claim to be legitimate surpl

Hitting the Facebook "Snooze" Button

Sat, 13 Jan 2018 05:00:00 EST

Find that you need a break from the nonsense that is Facebook? With its timely updates about what people are doing, not doing, eating, watching, thinking, feeling, is it any wonder we feel the need to socialize with others outside the social media platform? Though entirely responsible for the occasi

Caption This for 01/12/2018

Fri, 12 Jan 2018 21:45:00 EST

Here's this week's image: Thanks to user Nigh for the submission. We always need new photos! Feel free to submit to us anytime.

A Boy’s Dream: Experiencing GM’s Motorama in Person

Thu, 11 Jan 2018 14:00:00 EST

I couldn’t believe my good luck. A junior-high friend invited me to join him and his father on a journey into New York City to see the 1956 General Motors “Motorama.” This was billed as the biggest car show in the world and considered by aficionados to be the “grand pooh-ba

On the Donner Pass, the Lincoln Highway Once Forced Motorists Through an Active Train Tunnel

Wed, 10 Jan 2018 14:00:00 EST

While the threat of having your fellow traveler cannibalize you had more or less passed for motorists crossing the Donner Pass in California, they had another, far more ominous challenge to face on the route: a long, unlit, and utterly unpredictable trip through a railroad tunnel. “Imagine dr