10.2.2 The Safety Enclosure
Clearly, any safety system should be thought of providing a total ‘safety enclosure’ which prevents access from all sides to the dangerous voltages on the transformer under test. It is also clear that the infrared safety system can only provide one side of this safety enclosure - that which faces the operator.
If there is a danger that an operator or any other person could touch the transformer under test from either the side or the rear of the tester, then you must also take steps to prevent this, either by installing suitable physical barriers, or for example, by positioning the tester in the corner of the room so that existing walls prevent access to the transformer from the side and rear. The two vertical columns of the IR safety system would then normally be placed touching the physical barriers, which form the side-walls of the safety enclosure.
If there is any danger that the operator could touch the transformer under test from above, then further precautions should be taken to provide physical barriers to guard against this.