Casting a spell from an item

Casting a Spell from a Scroll:

RAW:
“If the spell is on your class’s spell list, you can read the scroll and cast its spell without providing any material components. Otherwise, the scroll is unintelligible…If the spell is on your class’s spell list but of a higher level than you can normally cast, you must make an ability check using your spellcasting ability to determine whether you cast it successfully. The DC equals 10 + the spell’s level. On a failed check, the spell disappears from the scroll with no other effect.
Ruling:
In accordance with RAW, spell scrolls work in exactly this way. The exception being Scroll of Protection which can be used by anyone who can read a language.

Casting a Spell from a Magic Item:

RAW: Casting a spell from a magic item generally functions like the spell itself (in terms of casting time, save DC, etc) but doesn't require components. Certain items makes exceptions to these rules.
Ruling: In the case of homebrew items, I generally include whether it's handled as a spell or not, and whether it involves the concentration of the item's wielder. If this isn't clear on an item, let me know.

Homebrew items: concentration and components

RAW: Casting a spell from a magic item generally functions like the spell itself (in terms of casting time, save DC, etc) but doesn't require components. Certain items makes exceptions to these rules.
Ruling: In the case of homebrew items, I generally include whether it's handled as a spell or not, and whether it involves the concentration of the item's wielder. If this isn't clear on an item, let me know.