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Hvac Electrical Wiring Diagram Symbols Print Home Hvac Wiring Diagram, Wiring Diagrams, Residential Hvac - What methods may be used to mount luminaries (lighting fixtures) to an outlet field fastened to an offset bar hanger? The luminaries that weight much less than 6-lbs perhaps hooked up with 6-32 screws if it is wall mount and 8-32’s most any in which else as much as 50-lbs. Then special help is needed for the box. (Pg. 30)—nec 314.27(a) and (b) what gain does a 4-in. Octagon container have over a 3¼-in. Octagon box? The additional length will allow a more quantity of conductors to go into and exit the box. The intensity of the field also can be extra with a 4-in. Octagon box than a three ¼-in. What is the size of the hole of a transfer (tool) field for a single tool? The size of a fashionable switch box is 2 in. X three in. (Pg. 33) the space between a door casing and a window casing is 3½ in. (88.9mm). Switches are to be installed at this location. What kind of switches could be used? A piggy-again switch, this means that the switches are stacked inside the identical region as a unmarried switch. A popular 2-gang rectangular container requires four inches so that you can handiest use a unmarried-gang box. (Pg. 34) 3 switches are set up in a 3-gang transfer (tool) box. The wall plate for this assembly is called a three-ganged cowl plate. The mounting holes in a tool (switch) field are tapped for no. 6-32 screws. The mounting holes in a outlet container are tapped for no. 8-32 screws. The mounting holes in metal packing containers for attaching equipment grounding conductors are tapped for 10-32 screws. A.) How excessive above the finished ground in the residing room are switches located? Forty six in. (Pg. Forty nine) b.) How excessive above the garage ground are switches located? 46in. Whilst a switch (device) container is nailed to a stud, and the nail runs through the box, the nails have to now not intervene with the wiring area. To perform this, keep the nail c (select a, b, or c.) A) halfway between the front and rear of the container. B) a maximum of ¼ in. (6mm) from the front fringe of the container. C) a most of ¼ in. (6mm) from the rear of the field. (Pg. 36—nec 314.23(b)(1)) hanging a ceiling luminaire (fixture) at once from a plastic outlet container is allowed most effective if the box is rated for a luminaire and if it weighs much less than 6 lbs. Then 6-32 screws may be used. It's far important to remember luminaire (fixture) wires when counting the accredited variety of conductors in a field according to 314.16. (Proper) (false) the code states that for small gadget grounding conductors or now not more than four conductors smaller than 14 awg that originate form a luminaire (fixture) canopy or comparable cover (like a fan) and terminate inside the field: don’t be counted these…no extra quantity required. Desk 314.16(a) permits a most of ten wires in a certain field. However, the field will have cable clamps and one fixture stud in it. What's the maximum number of wires allowed in this field? Clamps—if a container contains one or more inner cable clamps: upload a single-extent based on the largest conductor inside the container. (1) fixture studs—if box incorporates one or extra luminaire (fixture) studs or hickeys: add a singlevolume for every kind based totally on the largest conductor inside the field. (1) 10 wires – (1 for cable clamp & 1 for fixture stud or 2-total) = eight wires max. Whilst laying out a task, the electrician will typically make a layout of the circuit, taking into account the nice manner to run the cables and /or conduits and the way to make up the electrical connections. Doing this beforehand of time, the electrician determines exactly how many conductors might be fed into every box. With enjoy, the electrician will possibly pick out or 3 sizes and types of bins with the intention to provide ok space to “meet code.?? desk 314.Sixteen(a) of the code suggests the maximum number of conductors accepted in a given length box. Similarly to counting the variety of conductors on the way to be inside the field, what is the additional volume that ought to be supplied for the following items? Enter single or double extent allowance within the blank furnished. A.) One or greater internal cable clamps: single extent allowance. B.) For a fixture stud: unmarried quantity allowance. C.) For one or extra wiring devices on one yoke: double volume allowance. D.) For one or extra gadget grounding conductors: unmarried quantity allowance. (Pg.-45) is it permissible to install a receptacle outlet above an electric baseboard heater? No, page 48 states that aren't authorized to be located above an d electric baseboard heating unit. What is the most weight of a luminaire (lights fixture) accredited to be hung at once from an outlet field in a ceiling? 50 lbs. With out the box having additional guide and the box must be designed for the load, because of this it would should be listed for such an utility. (Pg. 30) nec phase 314.27 (a) (b).