The sizing requirements for pull boxes junction boxes handhole enclosures and conduit bodies exist to prevent conductor insulation damage.
Low voltage junction box requirements.
A solid connection between the exposed.
This rule is demonstrated nicely by wall switches receptacles and standard light fixtures all of.
1 to illustrate how these requirements prevent conductor insulation damage let s consider two extremes in a straight pull situation.
Ent smurf tube with splices in junction boxes.
Junction box 38 low voltage box 24 wall box 566 material.
Low voltage wires are typically thinner and less durable to begin with so protecting them is a good idea.
Electrical codes generally require that all electrical devices and the wiring connections to those devices must be enclosed in an approved electrical box often known as a junction box this metal or plastic box includes a cover to protect the wiring within and protect you from the wiring.
Those requirements are in 314 28 and they apply to all conductors 4 awg and larger fig.
1910 303 h 3 work space about equipment.
Just like with electrical wires it will protect them from damage while providing accessibility for splices.
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Personally i would prefer them to be in conduit e g.
Keep low and line voltage apart i often see two gang boxes installed with a cable or phone jack in one half and a 120v outlet in the other.
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If an exposed conductor of a low voltage wire comes in contact with 120v the higher voltage can damage what ever is at the end of the low voltage wire.
Except for underground box covers that weigh over 45 4 kg 100 lb doors and covers of enclosures used solely as pull boxes splice boxes or junction boxes shall be locked bolted or screwed on.
Junction boxes provide a safe grounded fireproof enclosure preventing wire nuts from coming loose and causing a short and possible electrical fire.