Attention-when the product is installed in Rack:
SAFETY CHECK-OUT
1. Prevention against overloading of branch circuit
When this product is installed in a rack and is
After correcting the original service problem,
supplied power from an outlet on the rack, please
perform the following safety checks beforemake sure that the rack does not overload the supply
releasing the set to the customer :circuit.
Check the metal trim, Ometallized� knobs,2. Providing protective earth
screws, and all other exposed metal parts for AC
When this product is installed in a rack and is
leakage. Check leakage as described below.supplied power from an outlet on the rack, please
confirm that the outlet is provided with a suitable
LEAKAGE TEST
protective earth connection.
The AC leakage from any exposed metal part to3. Internal air ambient temperature of the rack
earth ground and from all exposed metal parts to
When this product is installed in a rack, please make
any exposed metal part having a return tosure that the internal air ambient temperature of the
chassis, must not exceed 3.5 mA. Leakage
rack is within the specified limit of this product.
current can be measured by any one of three
methods.4. Prevention against achieving hazardous
condition due to uneven mechanical loading
1. A commercial leakage tester, such as theWhen this product is installed in a rack, please make
Simpson 229 or RCA WT-540A. Follow the
sure that the rack does not achieve hazardous
manufacturersO instructions to use thesecondition due to uneven mechanical loading.
instruments.
2. A battery-operated AC milliammeter. The
Data Precision 245 digital multimeter is
suitable for this job.
3. Measuring the voltage drop across a resistor
by means of a VOM or battery-operated AC
voltmeter. The Olimit� indication is 5.25 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM
that is suitable. Nearly all battery operated
digital multimeters that have a 20 V AC range
are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
0.15 mF1.5 kWvoltmeter
(5.25V)
Earth Ground
Fig A. Using an AC voltmeter to check AC leakage. |