ADC 150-2202-01, Руководство пользователя

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Overview 150-504-100-03
2 August 1, 2002 HRE-504 List 1, List 1B, and List 2
P
RESSURIZED
A
PPLICATIONS
For pressurized applications on the HRE-504 List 2, the Schrader air stem valve is used. A pressure gauge attaches
to the valve for the purpose of measuring the internal pressure of the enclosure. This valve is also used to relieve
the internal pressure prior to opening and removing the dome cover. This can be done by depressing the center pin
on the valve.
Figure 1 below and Figure 2 on page 3 show the Schrader air stem valve location.
Figure 1. HRE-504 List 2 Air-filled Remote Enclosure
An optional breather vent assembly is enclosed in the air-filled HRE-504 List 2 shipping kit. The kit is a small
plastic bag attached to a red and brown-colored spare pairs shrink tube. The breather vent replaces the pressure
relief valve, if the air-filled unit is not pressurized. The assembly allows the enclosure to breathe and keeps the
internal atmosphere free of harmful contaminants.
Figure 2 on page 3 shows the four metal valves.
This depressurizing must be performed every time the cover is removed from the enclosure.
Failure to do so may cause personal injury or damage to the equipment.
Unlike the gel-filled unit, the pressure cutoff valve in the air-filled unit cannot be used to cut off
an external source that is applied to the Schrader air stem valve. The air-filled unit pressure
cutoff valve can only control the air source that is applied to the enclosure through the air core
stub.
Pressure-
cutoff valve
Bottom View
Cable stub
entry
Optional pressure
relief valve or
breather-vent
Order wire
terminal
Grounding
lug
Schrader air-stem
valve and cap
Stainless steel
dome
Metal
locking
clamp
Order wire
Terminal
T-bar
lockable guard
Front View
Internal pressure
cutoff valve
Cable stub
Pressure
relief
valve