jcbabb
Member
- Location
- Norman, OK, USA
I have been attempting to use table 220.86 for a school project I'm working on. I thought I'd work through the examples in the handbook to make sure I was using it properly, and discovered a few mistakes.
The first step of the solution for Example 1 states:
My first problem is the use of the small 'm' prefix (which to me means milli) instead of the large 'M' prefix (which to me means MEGA). Not a big deal as long as you're paying attention. The very next line states:
OK, where in the heck did the '1.15 mVA' come from??? Even if you continue the improper use of the small 'm' prefix, the problem SHOULD then state:
It appears that they did the rest of the example properly, but they did it with the incorrect initial values. Example 2 doesn't get much better. They again mis-use the little 'm' prefix, again no biggie if you're paying attention. The next issue is the first line of the solution which states:
So they get the right result; they just leave off the 'M' (or 'm') from the 2.5 VA term.
I did several searches before posting this, but I never saw a post that addressed these issues. In fact, several that I saw glossed right over the 'magical' 1.15 substitution. I simply wanted to make a post here in case someone else is as confused as I was when working through the examples. Hope this helps.
The first step of the solution for Example 1 states:
My first problem is the use of the small 'm' prefix (which to me means milli) instead of the large 'M' prefix (which to me means MEGA). Not a big deal as long as you're paying attention. The very next line states:
OK, where in the heck did the '1.15 mVA' come from??? Even if you continue the improper use of the small 'm' prefix, the problem SHOULD then state:
It appears that they did the rest of the example properly, but they did it with the incorrect initial values. Example 2 doesn't get much better. They again mis-use the little 'm' prefix, again no biggie if you're paying attention. The next issue is the first line of the solution which states:
So they get the right result; they just leave off the 'M' (or 'm') from the 2.5 VA term.
I did several searches before posting this, but I never saw a post that addressed these issues. In fact, several that I saw glossed right over the 'magical' 1.15 substitution. I simply wanted to make a post here in case someone else is as confused as I was when working through the examples. Hope this helps.