About The Author

Author At The Helm

Harold In Control… of his sailboat

I am a Professional Electrical Control Systems Engineer.  I have been doing controls work now for over 25 years so I’ve built up a pretty good base of people, project, and technology skills in executing controls projects.

I love to be a part of making an idea do something useful whether it’s making cookies, Post-It Notes, or upgrading grain elevators.

Controls Engineering and related topics is what I have been blogging about.  The reason:  to  connect with potential clients and engineers on various topics that come to mind.  I’m also just trying to figure this social networking thing out.

One thing I’ve found useful in blogging is that I can refer clients and colleagues to my posts when one of the topics I’ve already blogged about comes up.  It helps in furthering our discussion and often gives me additional input.

For information about my professional credentials see my LinkedIn site at http://www.linkedIn.com/In/HaroldEnnulat .

On a personal note:  I’m married to my first wife for 23 years, and we have one child now 21.  I’m a Christian man working to live out his faith.  I enjoy philosophic discussions, music performance, sailing, good coffee, and nature walks among other things.

Updated: 10/22/2014



  1. Thank you sir. You are like a guru for me. Control engineer is my passion. I have graduated as an electronic engineer and still to start my professional career. sometimes I fear that this harsh conditions may compel me to switch field and then I may loss my field. What would you suggest me to make sure that I am secured as long as I am jobless. and thanks for sharing so many useful information related to my field.

    • Many engineers who start in controls end up doing other things by the time their career is ending.

      My advise is to keep your skills up to increase your value as you seek employment. Many companies offer free stuff for people out of work I’ve noticed. I was recently out of work and got a free copy of AutoCAD electrical and Wonderware programs to work with.

      Consider doing jobs at a discount if you see opportunities that may not be suitable for the long term. Network and meet with people in the field in your area. I see you are doing the social networking thing already, perhaps focus this on your passion area and work to build your own “professional brand”.

  2. […] About The Author […]

  3. Hi there,

    I just read a post on arc flash safety you posted a while back on your blog: https://hennulat.wordpress.com/2010/03/22/designing-for-arc-flash/

    I thought you might be interested in a resource of arc flash safety powerpoint presentations we just published, check it out: http://complianceandsafety.com/blog/arc-flash-powerpoint/

    You’re more than welcome to use any of the content in this resource on your site. We want it to help as many people as possible.

    Thanks a lot!

    Matthew Pelletier
    Director of Public Relations
    Compliance and Safety

    • Thanks. I’l be sure to take a look.

  4. Hey Harold,I just recently found your blog and I wanted to thank you for the advice I found there.It was really good.I have been fascinated by Panel Building over the years and I wanted to ask you two questions that have been on my mind for a while:
    1.When mounting components to the back panel what is the preferred fastener used.I have always been concerned about the thickness/thinness of the back panel and the ‘necessity’ for 4 threads in material for full strength,so as I understand it if we are using a 10-32 screw,for 4 thread contact we would need 4/32 or 1/8 inch thick metal……usual back panels I see today are 14 (.07)or maybe 12 ga(.10) which would make for a less than full strength condition.
    2. Do you have any advice for mounting wire duct on the back of a front panel between 2 rows of push buttons or lights, using a fastener,other than strong adhesive tape or glue.I have wondered if a stud welder would work ,the duct would cover any blemish but I was wondering if any mark would be seen on the front side of the panel.

    I would appreciated your ideas on these matters

    Thanks ,once again

    • I’m not sure what type of screws the assemblers use. However I do like to see star washers used just to be sure the mounting screws don’t back out during shipment. I’ve also seen screws with the star type washer built in to the head.
      As for wire duct mounting I also would prefer it either screwed to the panel, or if mounted on the front panel, then welding some studs on to the door is definitely an option. The examples I’ve seen did not mark or blemish the opposite side of the panel.

  5. Hey Harold,Thanks for your reply. Because some of the panels I see only have 2mm back panels I was wondering if assemblers were using self tapping screws because if they used ,say, an 8-32 screw on this thickness of 0.0787 at 32 tpi (each thread 0.0312)you would only have 2.5 threads in the steel. It doesn’t look adequate for strength…maybe a rivnut would be a stronger solution? Appreciate your opinion on this. I would also be interested in who would make a stud welder suitable for door welding a stud,that hopefully would not leave a mark. Thanks Neil

    • We use 16 to 12 gauge steel subpanels. 2mm is about 14 gauge I see. I’ve never heard of the screws pulling through the subpanel due to inadequate engagement. A larger screw or more screws would provide additional holding power when needed.

      I’m not sure where to get a stud welder. Googling produced a number of good leads. When you talk to a prospect, tell them what you are trying to do and ask that they bring over a unit to try on one of your panels. That’s how one of the shops I worked with got their stud welder and they got training to boot.

  6. Post under control panel post and i,ll make all future comments there. Thanks for visiting.

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