Если проводка старая, даже маленькая искра иногда вызывает пожар.

In Russian, the present-tense form of to be is usually omitted.

So:

• проводка старая = the wiring is old
• literally, it looks like wiring old

This is completely normal in Russian. If you wanted past or future, then a form of быть would appear:

• Проводка была старая = The wiring was old
• Проводка будет старая = The wiring will be old

Because проводка is a feminine noun.

Russian adjectives must agree with the noun they describe in:

• gender
• number
• case

Here:

• проводка = feminine singular
• so the adjective is старая = feminine singular

Compare:

• старый провод = old wire
• старая проводка = old wiring
• старое здание = old building

Проводка usually means wiring, especially electrical wiring in a building, house, or system.

So here it does not mean just one wire. It means the electrical wiring as a whole.

That is why the sentence sounds like a general warning: if the wiring is old, even a small spark can sometimes cause a fire.

Because Если проводка старая is a subordinate clause introduced by если (if).

In Russian, when a subordinate clause comes before the main clause, it is separated by a comma:

• Если X, Y. = If X, Y.

So:

• Если проводка старая, даже маленькая искра иногда вызывает пожар.

This comma is required.

Usually, yes. Here it introduces a condition:

• Если проводка старая... = If the wiring is old...

In this sentence, it expresses a general condition or general truth, not one specific future event.

That is why Russian uses present tense naturally in both parts:

• Если проводка старая, ... вызывает ...

This is similar to English sentences like:

• If water gets inside, the machine stops.
• If the wiring is old, a spark can cause a fire.

Because маленькая искра is the subject of вызывает.

Ask the question: What causes the fire?

Answer: даже маленькая искра.

So it stays in the nominative:

• искра = spark
• маленькая искра = a small spark

And the adjective agrees with the noun:

• искра is feminine singular
• so маленькая is feminine singular too

Вызывает is present tense of the imperfective verb вызывать.

It is used here because the sentence describes a general tendency or repeated possibility:

• old wiring + a spark = this sometimes causes a fire

So the sentence is not about one single future spark. It is about what can happen in general.

If you used вызовет, that would sound more like a specific future result:

• ... искра вызовет пожар = ... a spark will cause a fire

That is less natural for a general statement like this one.

Russian often uses the imperfective for:

• repeated actions
• general truths
• habitual situations
• things that can happen from time to time

Here, иногда вызывает means sometimes causes. That fits the imperfective very well.

So the sentence is presenting a general fact, not one completed event.

Иногда means sometimes.

It shows that the result does not happen every single time, but it is possible from time to time.

So:

• даже маленькая искра иногда вызывает пожар
• even a small spark sometimes causes a fire

It softens the statement slightly. Without иногда, the sentence would sound more absolute:

• даже маленькая искра вызывает пожар
• even a small spark causes a fire

That sounds stronger and less nuanced.

Даже means even, and it usually goes right before the word or phrase it emphasizes.

Here it emphasizes the whole noun phrase:

• даже маленькая искра = even a small spark

The idea is: not just a big dangerous spark, but even a small one.

This placement is very natural in Russian.

Пожар is the direct object of вызывает, so it is in the accusative case.

However, пожар is an inanimate masculine noun, and for many such nouns, the accusative singular looks the same as the nominative singular.

So:

• nominative: пожар
• accusative: пожар

That is why the form does not visibly change.

Compare with a feminine noun, where you would see a difference more clearly:

• вызывает проблему = causes a problem

Russian has no articles.

So:

• проводка can mean the wiring or just wiring
• искра can mean a spark
• пожар can mean a fire

English has to choose articles, but Russian leaves that to context.

In this sentence, English naturally uses:

• the wiring
• a small spark
• a fire

But Russian simply says the nouns without articles.

Yes. Russian word order is fairly flexible.

For example, you could also say:

• Даже маленькая искра иногда вызывает пожар, если проводка старая.

This means essentially the same thing: Even a small spark sometimes causes a fire if the wiring is old.

The original version starts with the condition first, which is very natural:

• Если проводка старая, ...

That structure is especially common in warnings, explanations, and general statements.

Yes, but it would sound more literary or formal.

Russian has:

• long-form adjectives: старая
• short-form adjectives: стара

In modern everyday speech, with this kind of sentence, the long form старая is much more common and natural.

So:

• Если проводка старая... = the normal everyday version

The short form can sound more formal, bookish, or stylistically marked.

Not exactly.

• пожар = a fire, especially an uncontrolled, dangerous fire
• огонь = fire/flame in a more general sense

In this sentence, пожар is the right choice because it means a destructive fire, the kind that can happen because of faulty wiring.

So вызывает пожар is much more natural than вызывает огонь here.

It describes a general fact or warning.

Several things show that:

• если introduces a general condition
• иногда means sometimes
• вызывает is present imperfective, good for habitual or repeated situations

So the sentence means something like:

• when wiring is old, even a small spark can sometimes lead to a fire

It is not about one particular spark at one particular moment.