TYPES OF APPROVAL
Before you complete the design of your product in accordance with the standard's requirements, you have to decide what 'proof' you need to show that it
complies. This is not a purely technical decision, but requires marketing, legal and technical input. Your decision depends on questions such as:
- What are the regulatory requirements in the countries do you want to sell the product, now and in the future?
- What are the national deviations for IEC 60601-1 in the countries where you will sell the product?
- Is compliance mandatory in the target market?
- If not mandatory, would it be advisable for product liability reasons?
- If not mandatory, would it be advisable for marketing reasons?
- If mandatory, is approval by a specific test house required?
- Can compliance be shown on the basis of self-declaration?
- What material is needed to justify self-declaration.?
There are two types of approval you can get from a test house. Which you choose will depend on the answers to the questions above.
1. The test house will test the product, and if compliant, will give you a license to put their 'mark' on each item of the product you ship. This
generally involves paying an annual license fee, as well as periodic visits to your production facilities to ensure that the product you are selling is identical to the product
2. The test house will test the product sample or samples you submit, and if compliant, will issue you a certificate and test report with regard to the
compliance of those samples only. As long as the product you sell is identical to the sample tested you can use the certificate and test report as justification for
self-certification in situations where this is acceptable,
e.g. for many product classifications under the Medical Devices Directive in the European Union. If you alter the product, you should refer back to the test house to see if any additional testing is necessary and any changes need to be made to the test report.
WHAT YOU NEED TO PREPARE
In addition to one or more samples for testing, you will be asked to submit the following material to the test house:
1. Product Schematics
2. Assembly Drawings
3. Parts List
4. Users Manual
5. Installation Guide
6. Data sheets and approval certificates of safety critical components.
7. Where circuits which must be separated are on a printed circuit board, a copy of the PCB layout transparency, marking the separate circuits.
Safety critical components are those components which can affect safety. This include all components in primary circuitry (e.g
. power supplies, transformers, mains switches, etc.) and any other component, the failure of which can affect safety (e.g. optocouplers,
thermal switches, lithium battery circuitry, etc.)
The test house will need to see the approval licenses for safety critical components in order to ensure that they were approved to an
appropriate standard, and that they are used in accordance with any conditions specified in the approval license. It is to your advantage to use
components that have been approved by the component manufacturer to the appropriate standard, otherwise you will have to bear the cost of approving the component, as well as
ensuring that the manufacturer does not change the component specification.
The manufacturer and model number of safety critical components will be recorded in the test report. It is also advantageous to have second
sources of safety critical components recorded at the time at the testing. It will probably cost more to have them included at a later stage.
Many product approvals are delayed due to difficulties in getting copies of component approval licenses. You should ask for these
certificates at the time you decide to incorporate the component in the design. Do not wait until you submit the product to the test house.
COURSE OF A PRODUCT INVESTIGATION
1. The test house should send you a checklist of the material they need for the investigation, similar to the checklist above.
2. The engineer in charge of the investigation will carry out a constructional review of the product, checking that it complies with the
constructional requirements of the standard. If there are any non-conformities you will be sent a deviation letter, listing the problems and
asking for your response. Depending on the problems, the response may be a declaration that changes will be made (e.g. to documentation or markings), or may involve
alteration of the product design and resubmittal.
3. Once the issues in the first deviation letter are resolved, the product will be tested in accordance with the tests that the engineer
considers relevant to your product. Once again, if there are any non-conformities you will be sent a deviation letter, and a response and
possible changes to the product are required to resolve the problems.
4. Laboratories which are accredited to ISO 17025 are committed to allow you to witness your product's testing, if you wish. You should
question the engineers findings if you have doubts about the results. The standard cannot cover all situations, and the engineer sometimes has to interpret the standard's
requirements for your particular product. You certainly know your product better than the engineer and if you take the trouble to learn the relevant parts of the standard, your
interpretation may be different, and if reasonable, you may be able to persuade the engineer or his reviewer that your interpretation is acceptable. A well argued response, based
on the standard and sound engineering judgment, may prevent the need for product changes.
5. Once all issues are resolved, and the engineer has all the documentation he needs, he will complete the test report and certificate.
Check all the details on the certificate and test report for mistakes. They should include the name and address of the manufacturer, the
product name and model, the serial number of the item tested, and the standard to which the product was tested, including any amendments to the standard and their dates.
6. It is good practice to have a person responsible for reviewing any changes to your product from the point of view of compliance.
This person should sign off every change to the product. He should liaise with your test house to see whether retesting is necessary or
a change is required to the test report. If you are subject to factory visits, the inspector has the right to revoke your license to 'mark' the
product if it differs from the product tested. A particular source of problems is the substitution of safety critical components. Your test report specifies the manufacturer and
model number of such components, and your license becomes invalid if you substitute a second source. You should try to plan second sourcing in advance and have alternate
components included in the initial testing of your product.
7. From time to time standards are amended, and older versions of the standard may no longer be in effect. In this case your approval
may need to be updated to the newer standard. Depending on the nature of the standard amendment and your product, this may involve no testing, partial testing, or even product