Sizing an Electrical Box 

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

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 !

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

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.

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

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

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

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

Nice explanation

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?

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

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

Thank you for the info. Good to know and how to figure it out.

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.

Thank you! This was very helpful!

Legend, thank you for simplify.

super helpful thank you

Very informative, great lesson.

Just took a Class with the gentleman who publishes the illustrated CEC and 12-3034 2(b) - one conductor for every insulated pair with a cap. And that is how we are doing it in Code Class. So your six wires as per the code is only 3 wires, plus 1 for every pair of caps.

Thanks u help me alot thank u again

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

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

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

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

It's hot == Swithed on/Under Load Wire nuts / connectors = cups for wires common guys

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!

Thanks

thanks a lot!

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

It's grate thank you very much

Perfect

hey quick question!! when there is a device present ( switch, outlet) do we use the largest conductor for caluclating the 2 conductors the code requires use to account for the device? or can we use the smallest wire for the volume calculation?

holey crap you need to help rewright the Hand book. Thank You

Should be 4*2 1/8

Hope you become Canadian version of Mike Holt one day

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

the last question should be Octagonal 4*2-1/2 because is 250 ml ,not 4*1-1/2

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

Hi, Can you please advise me how to prepare red seal exam for industries Electrician - i am totally confused how to get that material for preparation

thanks so much, it is clear

thanks! great vid

Are you able to help? I was given a vague question and need some assistance, please. How many insulated conductors are allowed in a 2 gang device box that contains? 1-Single pole switch, 1- three way switch, 2-two conductor connection and 2- three conductor connection. I've tried everything, drawing it, counting it. I am so confused with the 2 - two conductor connection and 2-three conductor connection part. I am able to calculate box fill but unsure how to account for these to count as conductors. Thanks

Hi Sir I couldn't solve a question in my exam...it was... What box size for... 4 pair connections #12 and 3 pair connections #8 Thanks .

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Hi how did you find 250.1 ml from table 23 4*2 1/2 oct

my new code book doesnt have that octagon size only 4x1 1/2 and 4x 2 1/8

how count bonding wires inside box?

The Octogon is 4x2-1/8 not ....1/2