Sizing an Electrical Box

In this video we discuss how to size the minimum electrical box required as per 12-3034 in the 2018 Canadian Electrical Code. Please note this video is intended as an instructional aid, and all inquiries should be discussed with your local jurisdictional authority for clarification. Thanks for watching!

Feel like buying Chris a coffee? Think of it as SchulerRuler fueler!

[martintassin]

Probably meant to say 4 X 2 1/8 on your last example. Thanks for posting!

[InServiceForTheGoodofAll]

I’m going to rewrite my Red Seal in April .. these clear easy to follow videos are going to help me prepare and become more confident, thank you !

[austinarbuckle]

You explained this 10000x better then my college professor! Thank you

[bizza]

you were my teacher at sait back in 2014, having to redo schooling back in ontario now. this helps so much. so happy i found this channel.

[athanrbles]

Thank you, Sir, very helpful, Electrician from the Philippines :)

[Al-wuis]

Simple and Clear. Perfect job.Thank you you helped me a lot.I love all your videos.

[lliammclachlan]

Thank you so much this was a huge help I was having a hard time with the concept before I watched your vid

[DarksidePride]

Great way of explaining the code booK! im writing my IP in a month and this is helping!

[alaaeddinjoumaa]

Hi
Can you please advise on how to size breaker, panel and fuses.
Thanks

[spelunkerd]

I thought I understood this pretty well, until I had to do an example with a GFCI measuring 3.4 cm deep. 12-3034(3) seems easy. 3.2sq cm X 3.4cm= 108.8 ml reduction of the box volume. Fine, we've accounted for the entire volume of the GFCI inside the box. Having accounted for the entire volume of the GFCI, do we still need to ALSO add two more conductors for the GFCI receptacle? As a back-of-the-envelope calculation for a typical AWG14 upstream box with insulated ground wires (total 6 wires+1 connector), this works out to needing 256.4 ml if I don't add two extra wires, and 305.6 ml if I also add two extra wires for the GFCI. Big difference! Does the remark "Except as specified by subrule 3..." in 12-3034(2) tell us we don't need to add the extra wires if we account for the entire volume of the GFCI?

[ashishnarula]

hello
very helpful video but in last example of different sizes of conductor calculated conductor area is 250 .xx ml why we take box in octagonal less than 250 you take the column one 245ml ( 15 Inch) can u please explain a bit
thanks

[larrys]

very informative...thank you . However, it's a bit misleading in that you mention that receptacles and switches count as 2 conductors each. The conductor calculations change if you install devices that are deeper than the standard 1" receptacles and switches. Items such as dimmer switches and GFCI's are deeper than 1". The formula to calculate the box fill for deeper receptacles is 82 x the depth of the receptacle (in cm) div by 2.54. For example..a receptacle that is 4cm deep (measured from the yoke(mounting bracket) to the back) would be 129 ml.

[canjamm]

Why is there no reduction for marrets switches or plugs from table 23, rather he adds to the wire count when there are switches, plugs and marrets

[spelunkerd]

Nice review, this is hard to remember if you don't do it every day.

[diyguy]

good... well done bro... one question that you didn't address... how do the bare ground wires count in this calculation?

[TTVISeeYoux]

Great video! helped a lot. Just a question were did you get the mL for each conductor on table 22? I cant seem to find it, Thanks!

[nadirgabir]

Just wonderjng if Rule 12-3036, derermining pull box size is applicable to underground installation and concrete manhole? Or only for buildings?

[JesusCruz-wtzp]

Can you do a video about when does neutral count a CCC...thanks

[bigm]

I appreciate the videos, thank you. You're a master of your craft.

[ruanmorrell]

Hi there I was wondering if you could do a example of a tap conductors for 2 cook tops that are less than 7.5m