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Code, advisories, safe electric practice for boxes/ enclosures
For household 120-240 volt power:
-Use only approved 600 volt cables, wires, enclosures, boxes, conduit etc for household 120-240 volt.
-Extension cords are not rated 600 volt, and cannot be used for permanent in-wall wiring.
Resources Extension cord code
-Do not use makeshift, homemade boxes that are not rated for household voltage.
-Correct box must be used for application ... a light fixture or fan requires round or octagon box ... cannot use switch box, or square junction box for light fixture ... cannot use round, octagon, or square junction box for switch and outlet.
-All enclosures and boxes require a cover that is made to fit box, and must sit flat and tight against box.
-Missing knockout holes must be filled.
-Keep enclosure door or cover in place and closed to contain spark and potential fire hazard.
-Box cannot have vent holes or heat fan installed where air supply can feed a potential fire. 
-Never solder household wiring connections. High heat from resistance, caused when amperage gets pushed through the wire by voltage, will melt solder and cause potential hazard.
-Use only approved 600 volt wire connectors. Never reuse old wire connectors.
-All enclosures, wiring, conduit etc must be attached firmly to structure, and located so cannot be damaged by lawn equipment etc. and best if located away from high heat, exposure to sun. Heat will cause deterioration of electrical installations.
-Enclosures require ground wire to be present and connected to all devices, equipment etc. Metal boxes and enclosures require connection to ground wire. Plastic boxes do not require grounding.
Resources: Safe electric wiring/ for boxes and enclosures     Color code for wire

Low-voltage structural wiring (doorbell, communication, TV etc):
-Never include low-voltage 'structural wiring' inside same enclosure, conduit, raceway or box as household voltage.
-Low voltage structural wiring and household wiring must be electrically separated to prevent insulation failure from energizing low voltage wires, cause fire and safety hazard.
-Structural wiring can be run inside walls, does not require enclosure, box conduit etc except for installation convenience, weatherproofing, reliability, organization, access to splices and connections etc.
-Household 120-240 volt wiring cannot be soldered ... but low-volt structural wires can be soldered when needed.
Resource: troubleshoot low voltage doorbell

Note that the LY2-LY3 15 amp relays are rated 10 amps for 2 and 3-pole relays. And 5 amps for LY4 4-pole relay.

Note that a 30 amp power relay, or switch, or contactor has safe maximum 80% rated value, or 24 amps. For 30 amp circuit, must use 600 volt, 10 gauge solid copper wire. Never undersize wire or use extension cord for permanent wiring.