In conjunction with Siemens, HV Power have developed a new ‘flat-pad Class B enclosure’. This unit provides outdoor class B compliance, which is critical for all network ring main units accessible to the public – especially where switching is initiated remotely or happens autonomously.
‘Flat-pad’ refers to the design being able to be mounted on a flat foundation pad, as its arc compliance is fully ‘built-in’ with internal baffles. The unit does not require a specific below-ground void/chamber to perform to specification, making the design ideal for sites where ground water can alter the volume of ‘venting space’ and hence void compliance in some designs.
Siemens flat-pad Class B outdoor RMU enclosure, on concrete plinth
Independently type-tested to IEC 62271-202, the enclosure ensures maximum safety for network operating staff as well as the general public as the new enclosure is internal arc classified as:
- IAC A (authorised personnel) Front, Lateral and Rear
- IAC B (unrestricted accessibility including public) Front, Lateral and Rear
The new flat-pad design is available in two sizes:
- 3-functions, 1890 mm wide x 916 mm deep x 1640 mm high
- 4-functions, 2320 mm wide x 916 mm deep x 1640 mm high.
The enclosure is specifically designed for the 630 A Siemens 11/22 kV ‘8DJH’ Ring Main Units. The 3-function enclosure has space for three ring main functions (panels) and an automation cubicle, while the 4-function enclosure can fit four ring main functions and an automation cubicle. Three/four 8DJH panels can be accommodated in any mix/order of:
- Ring switch
- Transformer fused feeder
- Circuit breaker
The enclosure material is galvanised steel with powder coating. A flat concrete mounting pad is also available for both sizes.
HV Power also continues to offer the ‘Bosecker’ range of stainless steel enclosures where larger panel combinations or more complex protection and automation schemes need to be accommodated.
Please contact Mike Strong (09 377 2001) if you would like to visit our Auckland Ring Main Warehouse to take a look at this product.