Elektriker64
Member
- Location
- Germany / Hannover
Hello from Germany,
we build machinery for the tire industry. For customers in the USA we build the cabinets acc. UL and NEC regulations.
Each cabinet group have its own main switch. The cabinet doors are interlocked with this switch and can be defeated with a screw at the main switch handle.
At the front doors we have warning signs "ELECTRIC ARC FLASH HAZARD...." and "Autorized personnel only".
Each machine will be pre-checked by the german TUV according to UL regulations.
The TUV tester now told me to cover all transformers inside the cabinet with additional plastics to protect workers from direct contact.
The transformers are "open type", the terminals are fingersafe but the windings are lacquered.
And now the question:
Is it really nessescary to cover all parts inside a cabinet even if the cabinet doors are interlocked and the opening of the cabinet is only allowed to skilled workers?
My NFPA way:
No additional covers needed.....
Thanks in advance
Andreas
we build machinery for the tire industry. For customers in the USA we build the cabinets acc. UL and NEC regulations.
Each cabinet group have its own main switch. The cabinet doors are interlocked with this switch and can be defeated with a screw at the main switch handle.
At the front doors we have warning signs "ELECTRIC ARC FLASH HAZARD...." and "Autorized personnel only".
Each machine will be pre-checked by the german TUV according to UL regulations.
The TUV tester now told me to cover all transformers inside the cabinet with additional plastics to protect workers from direct contact.
The transformers are "open type", the terminals are fingersafe but the windings are lacquered.
And now the question:
Is it really nessescary to cover all parts inside a cabinet even if the cabinet doors are interlocked and the opening of the cabinet is only allowed to skilled workers?
My NFPA way:
6.2. Protection against direct contact | |
6.2.1 Protection by Insulation ….. | not relevant |
6.2.2 Protection by Enclosures | yes, it is mounted in a cabinet |
6.2.2.1 Direct Contact from Outside….. | not relevant / no openings |
6.2.3 Enclosure Interlocking | relevant / I have an interlock |
6.2.3.1 Means shall be permitted to be provided for qualified persons…. | relevant / fullfilled by main the switch and warning signs / operator manual |
6.2.3.2 The Interlocking means shall ….. | relevant / fullfilled by the kind of the main switch |
6.2.3.3 Where provided with a defeat…. | not relevant / no live parts inside the cabinet doors. |
6.3.4 Enclosure Access | not relevant / for enclosures without main switch |
No additional covers needed.....
Thanks in advance
Andreas