COPENHAGEN, June 12 (Reuters) - U.S. electric vehicle

manufacturer Tesla has been reported to police in

Sweden accused of performing electrical installation work

without the necessary registration, the Swedish Electricians'

Union said on Wednesday.

There are already tense relations between Tesla and unions

in Sweden, where the company has faced prolonged industrial

action and its mechanics have been on strike since Oct. 27.

Tesla was not immediately available for comment when

contacted by Reuters.

"There is evidence indicating that Tesla is performing

electrical installation work at one of its charging stations.

This is despite the fact that Tesla is not registered with the

National Electrical Safety Board ," the union said in a press

release.

The union said that meant Tesla was not legally permitted to

carry out electrical installations under Swedish law.

"Since Tesla violates Swedish legislation, we have to react.

We can never accept illegal electrical installations," the

union's head of negotiations, Mikael Pettersson, said in a

statement.