Electrical Code Forum

Table 2-2. It doesn't mention directly mention what the heights are measured to (top, center, or bottom) of box. The only reference I see is in the last part of the sentence that begins on the prior page. I just want to ake sure I understand the general heights. Thanks.

Introducing our support based educational platform located at PaulAbernatby.com or Patreon.com/masterthenec We have 3 tiers of monthly support offering exclusive content on the National Electrical Code and other special offers exclusive fo our subscription supporters. Look for EXCLUSIVE 2020 NEC training very soon with weekly updates available only to you OUR SUPPORTERS. For those who pledge their support we Thank You!

This will probably be long winded but thanks for the patience. I have been told I cannot run more that 3 wires through tgi's in the same hole due to de-rating. I've also been told I can run more than 3 in the same bored hole. I'm confused. I understand the not more than 3 as far as a raceway is concerned but again, confused. We dont have to de-rate anything 2' and below, since that is considered a nipple. Are 5/8" holes every 12 inches considered to be nipples or are they considered to be a free air raceway since the cables travel with each other over multiple feet? A little scatter brained question I know, but that's how it is bouncing around in my head. Sorry.