Electrical testing on Machines

[Bobster]

All outgoing power circuits are tested to bs7671, as stated a loop test is not possible with a VSD powered circuit. Most drives have built in thermal/SC & earth leakage protection. Along with other forms of protection.

 

[netblindpaul]

The fixed install must be tested to BS7671, the assembly of machinery must be proven in accordance with the statute law, e.g. SMSR as your company is CE marking the production line in accordance with their statute law duty.

 

[LeeH]

Don't see why you cannot use the dead tests from 7671. You don't have to wait until the field cables are terminated into the rail before you do them.

As the manufacture you would have to provide proof of the integrity of the install even if it falls outside of 7671. I think plucking things from the BYB would go a long way to showing that. And you could inset that into the mandatory technical manual?

To the OP, does your company not provide ANYTHING after an installation?

 

[netblindpaul]

Don't see why you cannot use the dead tests from 7671. You don't have to wait until the field cables are terminated into the rail before you do them.

As the manufacture you would have to provide proof of the integrity of the install even if it falls outside of 7671. I think plucking things from the BYB would go a long way to showing that. And you could inset that into the mandatory technical manual?

To the OP, does your company not provide ANYTHING after an installation?

No, it would not, as BS7671 does NOT apply to machinery under the machinery directive, this statute law has it's own set of requirements.

 

[LeeH]

I know that Paul, I have already posted that.

But just because a set of tests are used in 7671 doesn't mean they cannot be applied elsewhere.

The OP's company build control panels and then install the field cabling that sees no verification and certification.

It's not just a machine built to 60204 and wheeled onto the factory floor.

 

[Darkwood]

The machine install itself will still be subject to testing albiet via the relevant BS60204, when the controls are energised after install and dependent on the machine design and layout as to what requires testing the Annex A of the BS60204 explains all the required testing procedures and confirmations and yes it does somewhat mimic the BS7671 in some of its wording or vice versa (chicken or egg).

On installation you still have to ensure the integrity of the electrical system you have just fitted again the extent of your testing is subject to machine/control design, exemptions do exist - Where the calculations of the fault loop impedance or of the resistance of the protective conductors are available and when the arrangement of the installation permits the verification of the length and csa of the conductors, verification of the continuity of the protective conductors can replace the Zs measurement.

Even having motors running of drives where you cannot do a practical measurement then you will still need to confirm the continuity of the protective conductor.

If you are as in the OP situation installing a machine line then it would almost definately be subject to required testing procedures if the OP expresses these are not been carried out then the installers or those commisioning the production line are not doing what is required to sign the system over.

 

[LeeH]

Exactly the point I was making dark wood.