Explosion-proof ads caption Class and Division; never generate a talking inspector

The housing still is identity. Class, Division, and Group are authored captions, not VO and not Veo type on a flame path. No talking inspector, no generated hazardous-area map.

An explosion-proof listing that books a specifier is the enclosure you tooled: flame path, joints, the glass, the conduit entries, the badge on the skirt. It is not a constructed inspector walking NEC Class I Division 1, and it is not a cinematic fire. Photograph the housing. Stamp the rating after picture lock. Leave the flame off the generate.

The housing still is the SKU

The buyer already knows what a box looks like. They need to recognise this enclosure: width, cover bolts, window, the part number in the silk. Text-to-video will invent a prettier brick with melted glyphs and a cousin Group. That is a failed SKU, not a cinematic upgrade.

Photograph the unit on the bench or in an empty bay you own. The AI product video generator is the door when the job is this object, moving: reference-to-video rows that hold a real object’s shape, colour, and label while the shot moves. Prompt only the camera. A slow push along the cover. A hold on the nameplate if the nameplate is already in the still and already true. Do not prompt “an explosion-proof housing in a busy plant, inspector explaining Class I.” That sentence is how the enclosure becomes a stock cabinet, a flame, and a mouth you did not hire.

If the still would fail a distributor audit — wrong window, extra hub, a colourway you do not stock — stop. Reshoot. A generated enclosure that looks Division 1 and is not is a claim. Do not generate a flame path the camera never saw. Do not generate a hazardous-area map. A map is a legal drawing. The housing is the listing.

Class, Division, and Group are authored type

Class I / II / III, Division 1 or 2, Group A–G — those strings are the listing. Video models do not typeset them. Image models will try; they will also invent a digit. A 1 that becomes a 2 for six frames is a scrap part on a feed.

Add a text overlay burns one authored string, whole clip, top / center / bottom. Optionally font size, color, background. It does not transcribe. It does not listen. “Class I / Div. 1 / Group C” is overlay copy, not a prompt adjective. Offers and ratings change by catalog row. Copy lock can be later than picture lock.

If someone said the rating on a take of a real named engineer, add captions transcribes that speech. A mute housing has nothing to transcribe. Overlay is the rating on a silent enclosure.

Do not overlay before you crop. Do not prompt the video model to “show Class I on the cover.” Invented Group is a listing miss. If the silk is already legible and matches the catalog, keep it.

No flame path, no generated map

A flame in frame is not proof. Specifiers buy the enclosure, not fire. Motion is a slow orbit of the approved still, not invented vapor. A generated map is a cousin plant. If the brief needs a drawing, scan the one you already sealed.

Manufacturers is plant-floor scale, QC, recruitment. It is not a Class/Division board. Electricians is the install crew: “don’t DIY this,” anonymized hazard finds. That page is not an OEM explosion-proof catalog. Do not rewrite /for.

Never generate a talking inspector

A constructed inspector walking Class, Division, “what you should install in this room,” or a code interpretation is a legal-adjacent persona. Synthetic presenters on health and finance are a YPP kill names AI personas that present as human experts on legal issues as well as health and finance. Hazardous-area classification is that shape. Labelling the face AI does not leave the bucket.

A silent housing is not that shape. A real named engineer on camera is a different day — then you caption that take. Generation can still do the box. It cannot be the code. Do not VO the rating over a flame the model invented.

Order: housing still; product-video motion if needed; overlay Class / Division / Group after crop; captions only if a real person spoke.

FAQ

Can Veo letter Class I on the real cover if I upload the still?

Do not treat Veo as a typesetter. Glyphs it adds are invented ratings. A flame path in the prompt is a hazard you did not measure. Upload the housing still for motion if you must, then burn overlay for Class, Division, and Group.

Is add-captions the same as overlay on a silent housing?

No. Add captions transcribes speech. Add a text overlay stamps a line you wrote. A mute enclosure has nothing to transcribe. The rating is authored type unless a real named person said it on camera.

Why not put an inspector on camera in the same generate?

A constructed inspector prescribing classification is a legal-expert talking head. Manufacturers is the plant page. Electricians is the crew page. This page is the housing still plus authored type. Two jobs. Two files. No generated map.

The nameplate is already in the photo and already true. Do I overlay anyway?

No. Overlay is for a string the still is missing, or a CTA the plate will not hold. If the silk is legible and matches the catalog, keep it. Do not regenerate a cousin cover to “make the Class sharper,” and do not add a flame so the rating “looks industrial.”